perf: Fix null pointer access in is_include_guest_event()

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Summary

CVECVE-2026-98268
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-06 09:18:16 UTC
Updated2026-10-06 09:18:16 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf: Fix null pointer access in is_include_guest_event() A typical module unload occurring event when there is an active perf connection leads to freeing of the pmu pointer. The call log is something like: .. __pmu_detach_event pmu_detach_event pmu_detach_events perf_pmu_unregister .. __pmu_detach_event() sets event->pmu to null. When the perf connection finally is closed, the following stack trace is observed: Oops: general protection fault, kernel NULL pointer dereference ... RIP: 0010:_free_event+0x3e/0x370 ... Call Trace: ... perf_event_release_kernel+0x260/0x2d0 perf_release+0x12/0x20 A call to mediated_pmu_unaccount_event() inside _free_event() is the root cause of this crash. Adding a check inside is_include_guest_event() ensures we don't accidentally access a null pmu ptr. In addition to this, we will now call mediated_pmu_unaccount_event() before clearing the pmu ptr so that nr_include_guest_events counts are maintained correctly.

Risk And Classification

EPSS: 0.001980000 probability, percentile 0.086730000 (date 2026-10-06)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected eff95e170275d9e80b968f335cd03d0ac250d2d1 7fa9a465ae8f07c0e4685db6edb6a6f984dbd784 git Not specified
CNA Linux Linux affected eff95e170275d9e80b968f335cd03d0ac250d2d1 88aed0422f39b22406f35f1e758cea25e7bbcfb5 git Not specified
CNA Linux Linux affected 7.0 Not specified
CNA Linux Linux unaffected 7.0 semver Not specified
CNA Linux Linux unaffected 7.2.8 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/88aed0422f39b22406f35f1e758cea25e7bbcfb5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7fa9a465ae8f07c0e4685db6edb6a6f984dbd784 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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