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[PATCH openEuler-1.0-LTS 0/3] CVE-2026-64341
by Jinjie Ruan 27 Jul '26

27 Jul '26

CVE-2026-64341 Johan Hovold (2): USB: iowarrior: fix use-after-free on disconnect USB: iowarrior: fix use-after-free on disconnect race Oliver Neukum (1): usb: iowarrior: remove inherent race with minor number drivers/usb/misc/iowarrior.c | 78 ++++++++++++++---------------------- 1 file changed, 30 insertions(+), 48 deletions(-) -- 2.34.1

2 4

[PATCH OLK-5.10] apparmor: fix use-after-free in rawdata dedup loop
by Cai Xinchen 27 Jul '26

27 Jul '26

From: Ruslan Valiyev <linuxoid(a)gmail.com> stable inclusion from stable-v5.10.261 commit 643221da57dbb1a8fd800610331cf1ec27969f71 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/16156 CVE: CVE-2026-63827 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 6f060496d03e4dc560a40f73770bd08335cb7a27 ] aa_replace_profiles() walks ns->rawdata_list to dedup the incoming policy blob against entries already attached to existing profiles. Per the kernel-doc on struct aa_loaddata, list membership does not hold a reference: profiles hold pcount, and when the last pcount drops, do_ploaddata_rmfs() is queued on a workqueue that takes ns->lock and removes the entry. Between dropping the last pcount and the workqueue running, an entry remains on the list with pcount == 0. aa_get_profile_loaddata() is an unconditional kref_get() on pcount, so when the dedup loop hits such an entry, refcount hardening reports refcount_t: addition on 0; use-after-free. inside aa_replace_profiles(), and the poisoned counter then trips "saturated" and "underflow" warnings on the subsequent uses of the same loaddata. Before commit a0b7091c4de4 ("apparmor: fix race on rawdata dereference") the dedup path used a get_unless_zero-style helper on a single counter, so the existing "if (tmp)" guard was meaningful. The split-refcount refactor introduced aa_get_profile_loaddata(), which has plain kref_get() semantics, and the guard quietly became a no-op. Introduce aa_get_profile_loaddata_not0(), matching the existing _not0 convention used by aa_get_profile_not0(), and use it for the rawdata_list dedup lookup so dying entries are skipped. Reproduced on x86_64 with v7.1-rc5 in QEMU+KVM running Ubuntu 24.04 + stress-ng 0.17.06: stress-ng --apparmor 1 --klog-check --timeout 60s Without this patch the three refcount_t warnings fire within a few seconds. With it the same 60 s run is clean. Coverage is a smoke-test only; a longer soak with CONFIG_KASAN, CONFIG_KCSAN and CONFIG_PROVE_LOCKING would be welcome from anyone with the cycles. Fixes: a0b7091c4de4 ("apparmor: fix race on rawdata dereference") Reported-by: Colin Ian King <colin.i.king(a)gmail.com> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=221513 Cc: stable(a)vger.kernel.org Signed-off-by: Ruslan Valiyev <linuxoid(a)gmail.com> Signed-off-by: John Johansen <john.johansen(a)canonical.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Cai Xinchen <caixinchen1(a)huawei.com> --- security/apparmor/include/policy_unpack.h | 19 +++++++++++++++++++ security/apparmor/policy.c | 8 ++++++-- 2 files changed, 25 insertions(+), 2 deletions(-) diff --git a/security/apparmor/include/policy_unpack.h b/security/apparmor/include/policy_unpack.h index 05baab73b578..2cd92c881acd 100644 --- a/security/apparmor/include/policy_unpack.h +++ b/security/apparmor/include/policy_unpack.h @@ -121,6 +121,25 @@ aa_get_profile_loaddata(struct aa_loaddata *data) return data; } +/** + * aa_get_profile_loaddata_not0 - get a profile reference count if not zero + * @data: reference to get a count on + * + * Like aa_get_profile_loaddata(), but safe to call on an entry that may + * be on a list (e.g. ns->rawdata_list) where the last pcount has already + * dropped and the deferred cleanup has not yet run. + * + * Returns: pointer to reference, or %NULL if @data is NULL or its + * profile refcount has already reached zero. + */ +static inline struct aa_loaddata * +aa_get_profile_loaddata_not0(struct aa_loaddata *data) +{ + if (data && kref_get_unless_zero(&data->pcount)) + return data; + return NULL; +} + void __aa_loaddata_update(struct aa_loaddata *data, long revision); bool aa_rawdata_eq(struct aa_loaddata *l, struct aa_loaddata *r); void aa_loaddata_kref(struct kref *kref); diff --git a/security/apparmor/policy.c b/security/apparmor/policy.c index 3ca34f47f51a..dca1c26c456d 100644 --- a/security/apparmor/policy.c +++ b/security/apparmor/policy.c @@ -974,8 +974,12 @@ ssize_t aa_replace_profiles(struct aa_ns *policy_ns, struct aa_label *label, if (aa_rawdata_eq(rawdata_ent, udata)) { struct aa_loaddata *tmp; - tmp = aa_get_profile_loaddata(rawdata_ent); - /* check we didn't fail the race */ + /* + * Entries remain on rawdata_list with + * pcount == 0 until do_ploaddata_rmfs() + * runs; only take a live profile ref. + */ + tmp = aa_get_profile_loaddata_not0(rawdata_ent); if (tmp) { aa_put_profile_loaddata(udata); udata = tmp; -- 2.18.0.huawei.25

2 1

[PATCH OLK-6.6] bpf: Reject fragmented frames in devmap
by Pu Lehui 27 Jul '26

27 Jul '26

From: Zhao Zhang <zzhan461(a)ucr.edu> stable inclusion from stable-v6.6.145 commit bccbab36ff228e0825eb85d9b0f9b8434cd0a399 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/16651 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit aa496720618f1a6054f1c870bf10b4f6c99bf656 upstream. Devmap broadcast redirects clone the packet for all but the last destination. For native XDP, that clone path copies only the linear xdp_frame data, while fragmented frames keep skb_shared_info in tailroom outside the linear area. Cloning such a frame leaves XDP_FLAGS_HAS_FRAGS set but without valid frag metadata, and the later free path can interpret uninitialized tail data as skb_shared_info, leading to an out-of-bounds access during frame return. Reject fragmented native XDP frames in dev_map_enqueue_clone(). Add the same restriction to the generic XDP clone path in dev_map_redirect_clone(). Generic XDP represents fragmented packets as nonlinear skbs, and rejecting them here keeps clone-based broadcast support aligned between native and generic XDP. Fixes: e624d4ed4aa8 ("xdp: Extend xdp_redirect_map with broadcast support") Cc: stable(a)kernel.org Reported-by: Yuan Tan <yuantan098(a)gmail.com> Reported-by: Zhengchuan Liang <zcliangcn(a)gmail.com> Reported-by: Xin Liu <bird(a)lzu.edu.cn> Assisted-by: Codex:GPT-5.4 Signed-off-by: Zhao Zhang <zzhan461(a)ucr.edu> Signed-off-by: Ren Wei <n05ec(a)lzu.edu.cn> Reviewed-by: Emil Tsalapatis <emil(a)etsalapatis.com> Reviewed-by: Toke Høiland-Jørgensen <toke(a)redhat.com> Link: https://lore.kernel.org/r/21c2d153dd25603d359069a02bf06779b51f6423.17803853… Signed-off-by: Alexei Starovoitov <ast(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Pu Lehui <pulehui(a)huawei.com> --- kernel/bpf/devmap.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/kernel/bpf/devmap.c b/kernel/bpf/devmap.c index b3ce546c0390..11cc63d9b744 100644 --- a/kernel/bpf/devmap.c +++ b/kernel/bpf/devmap.c @@ -558,6 +558,10 @@ static int dev_map_enqueue_clone(struct bpf_dtab_netdev *obj, { struct xdp_frame *nxdpf; + /* Frags live outside the linear frame and cannot be cloned safely. */ + if (unlikely(xdp_frame_has_frags(xdpf))) + return -EOPNOTSUPP; + nxdpf = xdpf_clone(xdpf); if (!nxdpf) return -ENOMEM; @@ -703,6 +707,9 @@ static int dev_map_redirect_clone(struct bpf_dtab_netdev *dst, struct sk_buff *nskb; int err; + if (unlikely(skb_is_nonlinear(skb))) + return -EOPNOTSUPP; + nskb = skb_clone(skb, GFP_ATOMIC); if (!nskb) return -ENOMEM; -- 2.34.1

2 1

[PATCH OLK-5.10 0/3] CVE-2026-64341
by Jinjie Ruan 27 Jul '26

27 Jul '26

CVE-2026-64341 Johan Hovold (2): USB: iowarrior: fix use-after-free on disconnect USB: iowarrior: fix use-after-free on disconnect race Oliver Neukum (1): usb: iowarrior: remove inherent race with minor number drivers/usb/misc/iowarrior.c | 78 ++++++++++++++---------------------- 1 file changed, 30 insertions(+), 48 deletions(-) -- 2.34.1

2 4

[PATCH OLK-6.6] selinux: fix incorrect execmem checks on overlayfs
by Cai Xinchen 27 Jul '26

27 Jul '26

From: Ondrej Mosnacek <omosnace(a)redhat.com> mainline inclusion from mainline-v7.2-rc4 commit 9fe595fad54d4ac6a402edb3f60bec859d52cea6 category: bugfix bugzilla: https://gitcode.com/openeuler/kernel/issues/9112 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- The commit fixing the overlayfs mmap() and mprotect() access checks failed to skip the execmem check in __file_map_prot_check() for the case where the "mounter check" is being performed. This check should be performed only against the credentials of the task that is calling mmap()/mprotect(), since it doesn't pertain to the file itself, but rather just gates the ability of the calling task to get an executable memory mapping in general. The purpose of the "mounter check" is to guard against using an overlayfs mount to gain file access that would otherwise be denied to the mounter. For execmem this is not relevant, as there is no further file access granted based on it (notice that the file's context is not used as the target in the check), so checking it also against the mounter credentials would be incorrect. Fix this by passing a boolean to [__]file_map_prot_check() and selinux_mmap_file_common() that indicates if we are doing the "mounter check" and skiping the execmem check in that case. Since this boolean also indicates if we use current_cred() or the mounter cred as the subject, also remove the "cred" argument from these functions and determine it based on the boolean and the file struct. Cc: stable(a)vger.kernel.org Fixes: 82544d36b172 ("selinux: fix overlayfs mmap() and mprotect() access checks") Signed-off-by: Ondrej Mosnacek <omosnace(a)redhat.com> Reviewed-by: Stephen Smalley <stephen.smalley.work(a)gmail.com> Signed-off-by: Paul Moore <paul(a)paul-moore.com> Signed-off-by: Cai Xinchen <caixinchen1(a)huawei.com> --- security/selinux/hooks.c | 42 +++++++++++++++++++++++----------------- 1 file changed, 24 insertions(+), 18 deletions(-) diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index 2d9f365022cb..b3d93234a4c3 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -3794,9 +3794,9 @@ static int selinux_file_ioctl_compat(struct file *file, unsigned int cmd, static int default_noexec __ro_after_init; -static int __file_map_prot_check(const struct cred *cred, - const struct file *file, unsigned long prot, - bool shared, bool bf_user_file) +static int __file_map_prot_check(const struct file *file, unsigned long prot, + bool shared, bool mounter_check, + bool bf_user_file) { struct inode *inode = NULL; bool prot_exec = prot & PROT_EXEC; @@ -3809,10 +3809,10 @@ static int __file_map_prot_check(const struct cred *cred, inode = file_inode(file); } - if (default_noexec && prot_exec && + if (!mounter_check && default_noexec && prot_exec && (!file || IS_PRIVATE(inode) || (!shared && prot_write))) { int rc; - u32 sid = cred_sid(cred); + u32 sid = current_sid(); /* * We are making executable an anonymous mapping or a private @@ -3825,6 +3825,8 @@ static int __file_map_prot_check(const struct cred *cred, } if (file) { + const struct cred *cred = mounter_check ? + file->f_cred : current_cred(); /* "read" always possible, "write" only if shared */ u32 av = FILE__READ; if (shared && prot_write) @@ -3838,11 +3840,11 @@ static int __file_map_prot_check(const struct cred *cred, return 0; } -static inline int file_map_prot_check(const struct cred *cred, - const struct file *file, - unsigned long prot, bool shared) +static inline int file_map_prot_check(const struct file *file, + unsigned long prot, bool shared, + bool mounter_check) { - return __file_map_prot_check(cred, file, prot, shared, false); + return __file_map_prot_check(file, prot, shared, mounter_check, false); } static int selinux_mmap_addr(unsigned long addr) @@ -3858,12 +3860,14 @@ static int selinux_mmap_addr(unsigned long addr) return rc; } -static int selinux_mmap_file_common(const struct cred *cred, struct file *file, - unsigned long prot, bool shared) +static int selinux_mmap_file_common(struct file *file, unsigned long prot, + bool shared, bool mounter_check) { if (file) { int rc; struct common_audit_data ad; + const struct cred *cred = mounter_check ? + file->f_cred : current_cred(); ad.type = LSM_AUDIT_DATA_FILE; ad.u.file = file; @@ -3872,15 +3876,16 @@ static int selinux_mmap_file_common(const struct cred *cred, struct file *file, return rc; } - return file_map_prot_check(cred, file, prot, shared); + return file_map_prot_check(file, prot, shared, mounter_check); } static int selinux_mmap_file(struct file *file, unsigned long reqprot __always_unused, unsigned long prot, unsigned long flags) { - return selinux_mmap_file_common(current_cred(), file, prot, - (flags & MAP_TYPE) == MAP_SHARED); + return selinux_mmap_file_common(file, prot, + (flags & MAP_TYPE) == MAP_SHARED, + false); } /** @@ -3912,8 +3917,9 @@ static int selinux_mmap_backing_file(struct vm_area_struct *vma, if (vma->vm_flags & VM_EXEC) prot |= PROT_EXEC; - return selinux_mmap_file_common(backing_file->f_cred, backing_file, - prot, vma->vm_flags & VM_SHARED); + return selinux_mmap_file_common(backing_file, prot, + vma->vm_flags & VM_SHARED, + true); } static int selinux_file_mprotect(struct vm_area_struct *vma, @@ -3974,11 +3980,11 @@ static int selinux_file_mprotect(struct vm_area_struct *vma, } } - rc = __file_map_prot_check(cred, file, prot, shared, backing_file); + rc = __file_map_prot_check(file, prot, shared, false, backing_file); if (rc) return rc; if (backing_file) { - rc = file_map_prot_check(file->f_cred, file, prot, shared); + rc = file_map_prot_check(file, prot, shared, true); if (rc) return rc; } -- 2.18.0.huawei.25

2 1

[PATCH OLK-5.10 v2] bpf: Reject BPF_MAP_TYPE_INODE_STORAGE creation if BPF LSM is uninitialized
by Pu Lehui 27 Jul '26

27 Jul '26

From: Matt Bobrowski <mattbobrowski(a)google.com> mainline inclusion from mainline-v7.2-rc2 commit a6f0643e4f63cfaa0d5d4a69de4f132eac4b8fe4 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/16515 CVE: CVE-2026-64192 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- When CONFIG_BPF_LSM=y is set, BPF inode storage maps (BPF_MAP_TYPE_INODE_STORAGE) are compiled into the kernel. However, if the BPF LSM is not explicitly enabled at boot time (e.g. omitted from the "lsm=" boot parameter), lsm_prepare() is never executed for the BPF LSM. Consequently, the BPF inode security blob offset (bpf_lsm_blob_sizes.lbs_inode) is never initialized and remains at its default compiled size of 8 bytes instead of being updated to a valid offset past the reserved struct rcu_head (typically 16 bytes or more). When a privileged user creates and updates a BPF_MAP_TYPE_INODE_STORAGE map, bpf_inode() evaluates inode->i_security + 8. This erroneously aliases the struct rcu_head.func callback pointer at the beginning of the inode->i_security blob. During subsequent map element cleanup or inode destruction, writing NULL to owner_storage clears the queued RCU callback pointer. When rcu_do_batch() later executes the queued callback, it attempts an instruction fetch at address 0x0, triggering an immediate kernel panic. Fix this by introducing a global bpf_lsm_initialized boolean flag marked with __ro_after_init. Set this flag to true inside bpf_lsm_init() when the LSM framework successfully registers the BPF LSM. Gate map allocation in inode_storage_map_alloc() on this flag, returning -EOPNOTSUPP if the BPF LSM is in turn uninitialized. This fail-fast approach prevents userspace from allocating inode storage maps when the supporting BPF LSM infrastructure is absent, avoiding zombie map states. Fixes: 8ea636848aca ("bpf: Implement bpf_local_storage for inodes") Reported-by: oxsignal <awo(a)kakao.com> Signed-off-by: Matt Bobrowski <mattbobrowski(a)google.com> Signed-off-by: Daniel Borkmann <daniel(a)iogearbox.net> Reviewed-by: Emil Tsalapatis <emil(a)etsalapatis.com> Reviewed-by: Amery Hung <ameryhung(a)gmail.com> Link: https://lore.kernel.org/bpf/20260628201103.3624525-1-mattbobrowski@google.c… Conflicts: include/linux/bpf_lsm.h kernel/bpf/bpf_inode_storage.c security/bpf/hooks.c [ctx conflicts] Signed-off-by: Pu Lehui <pulehui(a)huawei.com> --- include/linux/bpf_lsm.h | 4 ++++ kernel/bpf/bpf_inode_storage.c | 10 ++++++++++ security/bpf/hooks.c | 3 +++ 3 files changed, 17 insertions(+) diff --git a/include/linux/bpf_lsm.h b/include/linux/bpf_lsm.h index 272655378f94..4947fc758de8 100644 --- a/include/linux/bpf_lsm.h +++ b/include/linux/bpf_lsm.h @@ -13,6 +13,8 @@ #ifdef CONFIG_BPF_LSM +extern bool bpf_lsm_initialized __ro_after_init; + #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ RET bpf_lsm_##NAME(__VA_ARGS__); #include <linux/lsm_hook_defs.h> @@ -44,6 +46,8 @@ int bpf_lsm_get_retval_range(const struct bpf_prog *prog, struct bpf_retval_range *range); #else /* !CONFIG_BPF_LSM */ +#define bpf_lsm_initialized false + static inline int bpf_lsm_verify_prog(struct bpf_verifier_log *vlog, const struct bpf_prog *prog) { diff --git a/kernel/bpf/bpf_inode_storage.c b/kernel/bpf/bpf_inode_storage.c index a4ac48c7dada..4fd82425feba 100644 --- a/kernel/bpf/bpf_inode_storage.c +++ b/kernel/bpf/bpf_inode_storage.c @@ -223,6 +223,16 @@ static struct bpf_map *inode_storage_map_alloc(union bpf_attr *attr) { struct bpf_local_storage_map *smap; + /* + * Do not allow allocation of BPF_MAP_TYPE_INODE_STORAGE if the BPF LSM + * was not initialized by the LSM framework at boot. Without proper + * initialization, the BPF inode security blob offset remains unprepared, + * causing bpf_inode() to calculate an invalid memory offset and corrupt + * inode->i_security. + */ + if (!bpf_lsm_initialized) + return ERR_PTR(-EOPNOTSUPP); + smap = bpf_local_storage_map_alloc(attr); if (IS_ERR(smap)) return ERR_CAST(smap); diff --git a/security/bpf/hooks.c b/security/bpf/hooks.c index 788667d582ae..18f6ceccbfba 100644 --- a/security/bpf/hooks.c +++ b/security/bpf/hooks.c @@ -6,6 +6,8 @@ #include <linux/lsm_hooks.h> #include <linux/bpf_lsm.h> +bool bpf_lsm_initialized __ro_after_init; + static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = { #define LSM_HOOK(RET, DEFAULT, NAME, ...) \ LSM_HOOK_INIT(NAME, bpf_lsm_##NAME), @@ -17,6 +19,7 @@ static struct security_hook_list bpf_lsm_hooks[] __lsm_ro_after_init = { static int __init bpf_lsm_init(void) { security_add_hooks(bpf_lsm_hooks, ARRAY_SIZE(bpf_lsm_hooks), "bpf"); + bpf_lsm_initialized = true; pr_info("LSM support for eBPF active\n"); return 0; } -- 2.34.1

2 1

[PATCH OLK-5.10] RDMA/umem: Fix truncation for block sizes >= 4G
by Xia Fukun 27 Jul '26

27 Jul '26

From: Jason Gunthorpe <jgg(a)nvidia.com> stable inclusion from stable-v5.10.259 commit 2ff4b7817e5b78070c30f5fb5e678e452a2628b3 category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/15827 CVE: CVE-2026-53133 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- [ Upstream commit 15fe76e23615f502d051ef0768f86babaf08746c ] When the iommu is used the linearization of the mapping can give a single block that is very large split across multiple SG entries. When __rdma_block_iter_next() reassembles the split SG entries it is overflowing the 32 bit stack values and computed the wrong DMA addresses for blocks after the truncation. Use the right types to hold DMA addresses. Link: https://patch.msgid.link/r/1-v1-88303e9e509f+f7-ib_umem_types_jgg@nvidia.com Cc: stable(a)vger.kernel.org Fixes: a808273a495c ("RDMA/verbs: Add a DMA iterator to return aligned contiguous memory blocks") Signed-off-by: Jason Gunthorpe <jgg(a)nvidia.com> Signed-off-by: Sasha Levin <sashal(a)kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Signed-off-by: Chen Jinghuang <chenjinghuang2(a)huawei.com> Conflicts: drivers/infiniband/core/iter.c drivers/infiniband/core/verbs.c [Newer versions moved this function to iter.c, this version adapts the changes in verbs.c.] Signed-off-by: Xia Fukun <xiafukun(a)huawei.com> --- drivers/infiniband/core/verbs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c index d1220dae586b..02b324ea0b79 100644 --- a/drivers/infiniband/core/verbs.c +++ b/drivers/infiniband/core/verbs.c @@ -2919,8 +2919,8 @@ EXPORT_SYMBOL(__rdma_block_iter_start); bool __rdma_block_iter_next(struct ib_block_iter *biter) { - unsigned int block_offset; - unsigned int sg_delta; + dma_addr_t block_offset; + dma_addr_t sg_delta; if (!biter->__sg_nents || !biter->__sg) return false; -- 2.34.1

2 1

[PATCH OLK-6.6] mm/hugetlb_vmemmap: add vmemmap_split_lock in vmemmap_should_optimize()
by Jinjiang Tu 27 Jul '26

27 Jul '26

From: Quanmin Yan <yanquanmin1(a)huawei.com> hulk inclusion category: bugfix bugzilla: https://atomgit.com/openeuler/kernel/issues/9667 ------------------------ In vmemmap_should_optimize(), pmdp is calculated using vaddr and then used to obtain vmemmap_page. Because no lock is held during this process, an abnormal value of *pmdp is read when there are concurrent scenarios on ARM64: CPU 1 CPU 2 ------------------------ ----------------------------- vmemmap_update_pmd() vmemmap_should_optimize() ... ... pmdp = pmd_off_k(vaddr) pmd_clear(pmdp) (clear the same pmdp) ... pmd = READ_ONCE(*pmdp) (*pmdp is incorrect value) ... pte_page(*pte_offset_kernel(pmdp, vaddr)) pmd_populate_kernel() In the mainline patch be035a2acf1fa03caf77daff7d8a424f395cfb4c ("mm: hugetlb_vmemmap: move PageVmemmapSelfHosted() check to split_vmemmap_huge_pmd()"), the check for PageVmemmapSelfHosted() was moved into the locked section of vmemmap_pmd_entry(), preventing similar issues. To resolve the current single-point issue, we do not need to backport this highly conflict-prone patch. Instead, add vmemmap_split_lock to prevent concurrent modification of *pmdp by split_vmemmap_huge_pmd(). Fixes: 66361095129b ("mm: memory_hotplug: make hugetlb_optimize_vmemmap compatible with memmap_on_memory") Signed-off-by: Quanmin Yan <yanquanmin1(a)huawei.com> Signed-off-by: Jinjiang Tu <tujinjiang(a)huawei.com> --- mm/hugetlb_vmemmap.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index c197a609b342..3e9c2068a7b9 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -545,6 +545,13 @@ static bool vmemmap_should_optimize(const struct hstate *h, const struct page *h * vmemmap page. */ pmdp = pmd_off_k(vaddr); +#ifdef CONFIG_ARM64 + /* + * Add lock to prevent concurrent modification of *pmdp by + * split_vmemmap_huge_pmd() as described above. + */ + vmemmap_split_lock(&init_mm.page_table_lock); +#endif /* * The READ_ONCE() is used to stabilize *pmdp in a register or * on the stack so that it will stop changing under the code. @@ -557,6 +564,9 @@ static bool vmemmap_should_optimize(const struct hstate *h, const struct page *h vmemmap_page = pmd_page(pmd) + pte_index(vaddr); else vmemmap_page = pte_page(*pte_offset_kernel(pmdp, vaddr)); +#ifdef CONFIG_ARM64 + vmemmap_split_unlock(&init_mm.page_table_lock); +#endif /* * Due to HugeTLB alignment requirements and the vmemmap pages * being at the start of the hotplugged memory region in -- 2.43.0

2 1

[PATCH OLK-6.6 0/3] CVE: CVE-2026-64341
by Jinjie Ruan 27 Jul '26

27 Jul '26

CVE: CVE-2026-64341 Johan Hovold (2): USB: iowarrior: fix use-after-free on disconnect USB: iowarrior: fix use-after-free on disconnect race Oliver Neukum (1): usb: iowarrior: remove inherent race with minor number drivers/usb/misc/iowarrior.c | 78 ++++++++++++++---------------------- 1 file changed, 30 insertions(+), 48 deletions(-) -- 2.34.1

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[PATCH OLK-6.6] sctp: disable BH before calling udp_tunnel_xmit_skb()
by Wupeng Ma 27 Jul '26

27 Jul '26

From: Xin Long <lucien.xin(a)gmail.com> stable inclusion from stable-v6.12.95 commit be3bfcb34bda04f6a350710db471d4133f950f2c category: bugfix bugzilla: https://atomgit.com/src-openeuler/kernel/issues/15772 CVE: CVE-2026-53070 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id… -------------------------------- commit 2cd7e6971fc2787408ceef17906ea152791448cf upstream. udp_tunnel_xmit_skb() / udp_tunnel6_xmit_skb() are expected to run with BH disabled. After commit 6f1a9140ecda ("add xmit recursion limit to tunnel xmit functions"), on the path: udp(6)_tunnel_xmit_skb() -> ip(6)tunnel_xmit() dev_xmit_recursion_inc()/dec() must stay balanced on the same CPU. Without local_bh_disable(), the context may move between CPUs, which can break the inc/dec pairing. This may lead to incorrect recursion level detection and cause packets to be dropped in ip(6)_tunnel_xmit() or __dev_queue_xmit(). Fix it by disabling BH around both IPv4 and IPv6 SCTP UDP xmit paths. In my testing, after enabling the SCTP over UDP: # ip net exec ha sysctl -w net.sctp.udp_port=9899 # ip net exec ha sysctl -w net.sctp.encap_port=9899 # ip net exec hb sysctl -w net.sctp.udp_port=9899 # ip net exec hb sysctl -w net.sctp.encap_port=9899 # ip net exec ha iperf3 -s - without this patch: # ip net exec hb iperf3 -c 192.168.0.1 --sctp [ 5] 0.00-10.00 sec 37.2 MBytes 31.2 Mbits/sec sender [ 5] 0.00-10.00 sec 37.1 MBytes 31.1 Mbits/sec receiver - with this patch: # ip net exec hb iperf3 -c 192.168.0.1 --sctp [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec sender [ 5] 0.00-10.00 sec 3.14 GBytes 2.69 Gbits/sec receiver Fixes: 6f1a9140ecda ("net: add xmit recursion limit to tunnel xmit functions") Fixes: 046c052b475e ("sctp: enable udp tunneling socks") Signed-off-by: Xin Long <lucien.xin(a)gmail.com> Acked-by: Marcelo Ricardo Leitner <marcelo.leitner(a)gmail.com> Link: https://patch.msgid.link/c874a8548221dcd56ff03c65ba75a74e6cf99119.177601772… Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Alexander Martyniuk <alexevgmart(a)gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org> Conflicts: net/sctp/ipv6.c net/sctp/protocol.c [Wupeng Ma: conflicts due commit 05d6d492097c & 6a7d88ca15f7, cleanup only, no function changed] Signed-off-by: Wupeng Ma <mawupeng1(a)huawei.com> --- net/sctp/ipv6.c | 6 +++++- net/sctp/protocol.c | 2 ++ 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c index 0673857cb3d8b..93d9d32b186cc 100644 --- a/net/sctp/ipv6.c +++ b/net/sctp/ipv6.c @@ -227,6 +227,7 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t) struct ipv6_pinfo *np = inet6_sk(sk); __u8 tclass = np->tclass; __be32 label; + int ret; pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, skb->len, &fl6->saddr, &fl6->daddr); @@ -263,9 +264,12 @@ static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t) skb_set_inner_ipproto(skb, IPPROTO_SCTP); label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6); - return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr, + local_bh_disable(); + ret = udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr, &fl6->daddr, tclass, ip6_dst_hoplimit(dst), label, sctp_sk(sk)->udp_port, t->encap_port, false); + local_bh_enable(); + return ret; } /* Returns the dst cache entry for the given source and destination ip diff --git a/net/sctp/protocol.c b/net/sctp/protocol.c index 94c6dd53cd62d..824c3f38554f7 100644 --- a/net/sctp/protocol.c +++ b/net/sctp/protocol.c @@ -1085,9 +1085,11 @@ static inline int sctp_v4_xmit(struct sk_buff *skb, struct sctp_transport *t) skb_reset_inner_mac_header(skb); skb_reset_inner_transport_header(skb); skb_set_inner_ipproto(skb, IPPROTO_SCTP); + local_bh_disable(); udp_tunnel_xmit_skb((struct rtable *)dst, sk, skb, fl4->saddr, fl4->daddr, dscp, ip4_dst_hoplimit(dst), df, sctp_sk(sk)->udp_port, t->encap_port, false, false); + local_bh_enable(); return 0; } -- 2.43.0

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