CVE-2026-31528

Kernel memory corruption via wrong PMU handlers

Published Apr 22, 2026 · Updated Apr 22, 2026

Out-of-bounds access in Linux Kernel allows local users to corrupt kernel memory through inherited perf event groups. The inherit and __perf_event_read() paths use event->pmu instead of pmu_ctx->pmu, causing mixed groups to invoke transaction handlers for the wrong PMU during rollback. A low-privilege process can combine an inheritable software-event leader with an over-constrained hardware group, then fork and schedule it to trigger kernel disclosure, corruption, or a panic.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux Kernel allows local users to corrupt kernel memory through inherited perf event groups. The inherit and __perf_event_read() paths use event->pmu instead of pmu_ctx->pmu, causing mixed groups to invoke transaction handlers for the wrong PMU during rollback. A low-privilege process can combine an inheritable software-event leader with an over-constrained hardware group, then fork and schedule it to trigger kernel disclosure, corruption, or a panic.

The record

CVE
CVE-2026-31528
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=bd27568117664b8b3e259721393df420ed51f57b <35f7914e54fe7f13654c22ee045b05e4b6d8062b
  3. Affected versionversion=bd27568117664b8b3e259721393df420ed51f57b <3a696e84a8b1fafdd774bb30d62919faf844d9e4
  4. Affected versionversion=bd27568117664b8b3e259721393df420ed51f57b <4b9ce671960627b2505b3f64742544ae9801df97
  5. Affected versionversion=bd27568117664b8b3e259721393df420ed51f57b <4c759446046500a1a6785b25725725c3ff087ace
  6. Affected versionversion=bd27568117664b8b3e259721393df420ed51f57b <656f35b463995bee024d948440128230aacd81e1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.2; version=bd27568117664b8b3e259721393df420ed51f57b <35f7914e54fe7f13654c22ee045b05e4b6d8062b; version=bd27568117664b8b3e259721393df420ed51f57b <3a696e84a8b1fafdd774bb30d62919faf844d9e4; version=bd27568117664b8b3e259721393df420ed51f57b <4b9ce671960627b2505b3f64742544ae9801df97; version=bd27568117664b8b3e259721393df420ed51f57b <4c759446046500a1a6785b25725725c3ff087ace; version=bd27568117664b8b3e259721393df420ed51f57b <656f35b463995bee024d948440128230aacd81e1

Published CVSS scores

7.8Linux Kernel CVE TeamCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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