CVE-2026-31528perf: Make sure to use pmu_ctx->pmu for groups
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from bd27568117664b8b3e259721393df420ed51f57b before 656f35b463995bee024d948440128230aacd81e1; from bd27568117664b8b3e259721393df420ed51f57b before 3a696e84a8b1fafdd774bb30d62919faf844d9e4; from bd27568117664b8b3e259721393df420ed51f57b before 35f7914e54fe7f13654c22ee045b05e4b6d8062b; from bd27568117664b8b3e259721393df420ed51f57b before 4c759446046500a1a6785b25725725c3ff087ace; from bd27568117664b8b3e259721393df420ed51f57b before 4b9ce671960627b2505b3f64742544ae9801df97 | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; 7.0; 7.0; 7.0 | NVD |
References
- https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1patch
- https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4patch
- https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062bpatch
- https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087acepatch
- https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.