futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy()

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Summary

CVECVE-2026-23415
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-02 12:16:20 UTC
Updated2026-04-02 12:16:20 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: futex: Fix UaF between futex_key_to_node_opt() and vma_replace_policy() During futex_key_to_node_opt() execution, vma->vm_policy is read under speculative mmap lock and RCU. Concurrently, mbind() may call vma_replace_policy() which frees the old mempolicy immediately via kmem_cache_free(). This creates a race where __futex_key_to_node() dereferences a freed mempolicy pointer, causing a use-after-free read of mpol->mode. [ 151.412631] BUG: KASAN: slab-use-after-free in __futex_key_to_node (kernel/futex/core.c:349) [ 151.414046] Read of size 2 at addr ffff888001c49634 by task e/87 [ 151.415969] Call Trace: [ 151.416732] __asan_load2 (mm/kasan/generic.c:271) [ 151.416777] __futex_key_to_node (kernel/futex/core.c:349) [ 151.416822] get_futex_key (kernel/futex/core.c:374 kernel/futex/core.c:386 kernel/futex/core.c:593) Fix by adding rcu to __mpol_put().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c042c505210dc3453f378df432c10fff3d471bc5 853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 git Not specified
CNA Linux Linux affected c042c505210dc3453f378df432c10fff3d471bc5 7e196194ea27bd49adf3551e2aceb83498eb73fe git Not specified
CNA Linux Linux affected c042c505210dc3453f378df432c10fff3d471bc5 190a8c48ff623c3d67cb295b4536a660db2012aa git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.18.21 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.11 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0-rc6 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/853f70c67d1b37e368fdcb3e328c4b8c04f53ac0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/190a8c48ff623c3d67cb295b4536a660db2012aa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e196194ea27bd49adf3551e2aceb83498eb73fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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