Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: perf: Make sure to use pmu_ctx->pmu for groups Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access when group_sched_in() fails and needs to roll back. This *should* be handled by the transaction callbacks, but he found that when the group leader is a software event, the transaction handlers of the wrong PMU are used. Despite the move_group case in perf_event_open() and group_sched_in() using pmu_ctx->pmu. Turns out, inherit uses event->pmu to clone the events, effectively undoing the move_group case for all inherited contexts. Fix this by also making inherit use pmu_ctx->pmu, ensuring all inherited counters end up in the same pmu context. Similarly, __perf_event_read() should use equally use pmu_ctx->pmu for the group case.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.2, < 6.6.131 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062bPatch
- https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4Patch
- https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97Patch
- https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087acePatch
- https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1Patch
FAQ
What is CVE-2026-31528?
CVE-2026-31528 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: perf: Make sure to use pmu_ctx->pmu for groups Oliver reported that x86_pmu_del() ended up doing an out-of-bound memory access whe...
How severe is CVE-2026-31528?
CVE-2026-31528 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-31528?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.