rust: devres: fix race between concurrent revokers

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Summary

CVECVE-2026-89764
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:07 UTC
Updated2026-09-11 20:20:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: rust: devres: fix race between concurrent revokers There is a potential race condition when two paths try to revoke a Devres concurrently. The driver core's devres_release_all() calls Revocable::revoke() via the release callback, while Devres::drop() calls revoke_nosync() on another CPU. The revoker that does not claim the is_available swap returns immediately, but the revoker that did may still be executing drop_in_place() on the inner data. This can cause a use-after-free when the other revoker's caller proceeds to drop adjacent resources that drop_in_place() still references (e.g., Devres<DmaMappedSgt> racing with SGTable freeing the backing sg_table and pages). Fix this by adding a Completion. The release callback signals the Completion after revoke() finishes, and Devres::drop() waits for it when it loses the is_available swap. This ensures the wrapped object is fully torn down before Devres::drop() returns.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 05aa6fb1c21d7fb9df735da24096d793223789d5 c7e3d57c705ab1053a6a1bbef96795e792da1540 git Not specified
CNA Linux Linux affected 05aa6fb1c21d7fb9df735da24096d793223789d5 acc516dfa1972d31836b50abc0115216cd0fccc5 git Not specified
CNA Linux Linux affected 6.18 Not specified
CNA Linux Linux unaffected 6.18 semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/acc516dfa1972d31836b50abc0115216cd0fccc5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c7e3d57c705ab1053a6a1bbef96795e792da1540 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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