Vulnerability Description
In 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[].
References
- https://git.kernel.org/stable/c/6b089028bff1f2ff9e0c62b8f1faca1a620e5d6e
- https://git.kernel.org/stable/c/7e772a93eb61cb6265bdd1c5bde17d0f2718b452
- https://git.kernel.org/stable/c/cf69b99805c263117305ac6dffbc85aaf9259d32
FAQ
What is CVE-2025-68375?
CVE-2025-68375 is a documented vulnerability. In 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, th...
How severe is CVE-2025-68375?
CVSS scoring is not yet available for CVE-2025-68375. Check NVD for updates.
Is there a patch for CVE-2025-68375?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.