bpf: Invalidate RCU pointers after final spin unlock

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90317
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:29 UTC
Updated2026-09-17 17:17:29 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: bpf: Invalidate RCU pointers after final spin unlock In a sleepable BPF program, a spin lock can provide the only RCU protection for a kptr. The final bpf_spin_unlock() ends that protection, but the verifier leaves the pointer valid. Another CPU can then free the object before the pointer is used. A capability-limited runtime PoC triggered a task_struct use-after-free in __bpf_get_task_stack(). Record whether the program is in an RCU-protected context before releasing the lock. Invalidate RCU-protected pointers only when the unlock leaves the final such context. This preserves valid pointers in non-sleepable programs and inside an explicit RCU read-side section.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5861d1e8dbc4e1a03ebffb96ac041026cdd34c07 7ae71629357d0a6d0bdadb929c7b296d5b7e61c2 git Not specified
CNA Linux Linux affected 5861d1e8dbc4e1a03ebffb96ac041026cdd34c07 180c7000712db77063b3a26f4c97e7dd9038f449 git Not specified
CNA Linux Linux affected 6.6 Not specified
CNA Linux Linux unaffected 6.6 semver Not specified
CNA Linux Linux unaffected 7.2.6 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/180c7000712db77063b3a26f4c97e7dd9038f449 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7ae71629357d0a6d0bdadb929c7b296d5b7e61c2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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