CVE-2026-31528 (GCVE-0-2026-31528)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:54 – Updated: 2026-04-22 13:54
VLAI?
Title
perf: Make sure to use pmu_ctx->pmu for groups
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bd27568117664b8b3e259721393df420ed51f57b , < 656f35b463995bee024d948440128230aacd81e1 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 3a696e84a8b1fafdd774bb30d62919faf844d9e4 (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 35f7914e54fe7f13654c22ee045b05e4b6d8062b (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4c759446046500a1a6785b25725725c3ff087ace (git)
Affected: bd27568117664b8b3e259721393df420ed51f57b , < 4b9ce671960627b2505b3f64742544ae9801df97 (git)
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    Linux Linux Affected: 6.2
Unaffected: 0 , < 6.2 (semver)
Unaffected: 6.6.131 , ≤ 6.6.* (semver)
Unaffected: 6.12.80 , ≤ 6.12.* (semver)
Unaffected: 6.18.21 , ≤ 6.18.* (semver)
Unaffected: 6.19.11 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf: Make sure to use pmu_ctx-\u003epmu for groups\n\nOliver reported that x86_pmu_del() ended up doing an out-of-bound memory access\nwhen group_sched_in() fails and needs to roll back.\n\nThis *should* be handled by the transaction callbacks, but he found that when\nthe group leader is a software event, the transaction handlers of the wrong PMU\nare used. Despite the move_group case in perf_event_open() and group_sched_in()\nusing pmu_ctx-\u003epmu.\n\nTurns out, inherit uses event-\u003epmu to clone the events, effectively undoing the\nmove_group case for all inherited contexts. Fix this by also making inherit use\npmu_ctx-\u003epmu, ensuring all inherited counters end up in the same pmu context.\n\nSimilarly, __perf_event_read() should use equally use pmu_ctx-\u003epmu for the\ngroup case."
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    "dateReserved": "2026-03-09T15:48:24.111Z",
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}


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