GHSA-37P2-PRPF-4QX7
Vulnerability from github – Published: 2026-04-22 15:31 – Updated: 2026-04-27 15:30In 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.
{
"affected": [],
"aliases": [
"CVE-2026-31528"
],
"database_specific": {
"cwe_ids": [
"CWE-125"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-04-22T14:16:53Z",
"severity": "HIGH"
},
"details": "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.",
"id": "GHSA-37p2-prpf-4qx7",
"modified": "2026-04-27T15:30:40Z",
"published": "2026-04-22T15:31:44Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31528"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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