CVE-2026-31528

HIGH EPSS 2.9%
Published Apr 22, 20262mo ago · Modified Jun 17, 20261w ago
7.8 CVSS 3.1
High
Find Similar
Published Apr 22, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.8
Exploitability
1.8
Impact
5.9
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
2.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-125 Out-of-bounds Read Memory Safety

Affected Products 8

VendorProductVersionRange
linuxlinux_kernel*≥6.2  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 5

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

Remediation

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