futex: Drop CLONE_THREAD requirement for private default hash alloc

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Summary

CVECVE-2026-52973
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:07 UTC
Updated2026-06-24 17:17:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: futex: Drop CLONE_THREAD requirement for private default hash alloc Currently need_futex_hash_allocate_default() depends on strict pthread semantics, abusing CLONE_THREAD. This breaks the non-concurrency assumptions when doing the mm->futex_ref pcpu allocations, leading to bugs[0] when sharing the mm in other ways; ie: BUG: KASAN: slab-use-after-free in futex_hash_put ... where the +1 bias can end up on a percpu counter that mm->futex_ref no longer points at. Loosen the check to cover any CLONE_VM clone, except vfork(). Excluding vfork keeps the existing paths untouched (no overhead), and we can't race in the first place: either the parent is suspended and the child runs alone, or mm->futex_ref is already allocated from an earlier CLONE_VM.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d9b05321e21e4b218de4ce8a590bf375f58b6346 1dcd36420af2da5bd59306dba9caf78e3d248b1d git Not specified
CNA Linux Linux affected d9b05321e21e4b218de4ce8a590bf375f58b6346 974ac49a9a068b0591a59f65c63eb06579a13091 git Not specified
CNA Linux Linux affected d9b05321e21e4b218de4ce8a590bf375f58b6346 ee9dce44362b2d8132c32964656ab6dff7dfbc6a git Not specified
CNA Linux Linux affected 6.17 Not specified
CNA Linux Linux unaffected 6.17 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/974ac49a9a068b0591a59f65c63eb06579a13091 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ee9dce44362b2d8132c32964656ab6dff7dfbc6a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1dcd36420af2da5bd59306dba9caf78e3d248b1d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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