# CVE-2025-68375: linux: In the Linux kernel, the following vulnerability has been resolved:  perf/x86: Fix NULL event access and potential PE...

CVE-2025-68375 is fixed in linux on 1 platform by DEBIAN-CVE-2025-68375 (version 6.17.13-1), released December 24, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-68375
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0019
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 24, 2025

## 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[].

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 6.17.13-1 | [DEBIAN-CVE-2025-68375](https://patchblox.com/security/data/fix/linux/debian-cve-2025-68375.md) | Dec 24, 2025 |

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