perf/x86: Fix NULL event access and potential PEBS record loss

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2025-68375
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2025-12-24 11:16:01 UTC
Updated2026-10-13 11:10:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: perf/x86: Fix NULL event access and potential PEBS record loss When intel_pmu_drain_pebs_icl() is called to drain PEBS records, the perf_event_overflow() could be called to process the last PEBS record. While perf_event_overflow() could trigger the interrupt throttle and stop all events of the group, like what the below call-chain shows. perf_event_overflow() -> __perf_event_overflow() ->__perf_event_account_interrupt() -> perf_event_throttle_group() -> perf_event_throttle() -> event->pmu->stop() -> x86_pmu_stop() The side effect of stopping the events is that all corresponding event pointers in cpuc->events[] array are cleared to NULL. Assume there are two PEBS events (event a and event b) in a group. When intel_pmu_drain_pebs_icl() calls perf_event_overflow() to process the last PEBS record of PEBS event a, interrupt throttle is triggered and all pointers of event a and event b are cleared to NULL. Then intel_pmu_drain_pebs_icl() tries to process the last PEBS record of event b and encounters NULL pointer access. To avoid this issue, move cpuc->events[] clearing from x86_pmu_stop() to x86_pmu_del(). It's safe since cpuc->active_mask or cpuc->pebs_enabled is always checked before access the event pointer from cpuc->events[].

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 9734e25fbf5ae68eb04234b2cd14a4b36ab89141 cf69b99805c263117305ac6dffbc85aaf9259d32 git Not specified
CNA Linux Linux affected 9734e25fbf5ae68eb04234b2cd14a4b36ab89141 6b089028bff1f2ff9e0c62b8f1faca1a620e5d6e git Not specified
CNA Linux Linux affected 9734e25fbf5ae68eb04234b2cd14a4b36ab89141 7e772a93eb61cb6265bdd1c5bde17d0f2718b452 git Not specified
CNA Linux Linux affected 6.16 Not specified
CNA Linux Linux unaffected 6.16 semver Not specified
CNA Linux Linux unaffected 6.17.13 6.17.* semver Not specified
CNA Linux Linux unaffected 6.18.2 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6b089028bff1f2ff9e0c62b8f1faca1a620e5d6e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7e772a93eb61cb6265bdd1c5bde17d0f2718b452 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf69b99805c263117305ac6dffbc85aaf9259d32 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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