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Vulnerability record · CVE-2026-31528 · published 22 April 2026

CVE-2026-31528: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.18% · top 93.7% CWE-125 · Out-of-bounds read
7.8CVSS 3.1 base score
0.18%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
5References
17 Jun 2026Last modified by NVD

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:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/35f7914e54fe7f13654c22ee045b05e4b6d8062b Patch
https://git.kernel.org/stable/c/3a696e84a8b1fafdd774bb30d62919faf844d9e4 Patch
https://git.kernel.org/stable/c/4b9ce671960627b2505b3f64742544ae9801df97 Patch
https://git.kernel.org/stable/c/4c759446046500a1a6785b25725725c3ff087ace Patch
https://git.kernel.org/stable/c/656f35b463995bee024d948440128230aacd81e1 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31528), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.