Race Condition Affecting linux-6.1 package, versions <6.1.170-1~deb11u1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.11% (2nd percentile)

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  • Snyk IDSNYK-DEBIAN11-LINUX61-16399070
  • published4 May 2026
  • disclosed20 Mar 2026

Introduced: 20 Mar 2026

CVE-2026-23271  (opens in a new tab)
CWE-362  (opens in a new tab)

How to fix?

Upgrade Debian:11 linux-6.1 to version 6.1.170-1~deb11u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream linux-6.1 package and not the linux-6.1 package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

In the Linux kernel, the following vulnerability has been resolved:

perf: Fix __perf_event_overflow() vs perf_remove_from_context() race

Make sure that __perf_event_overflow() runs with IRQs disabled for all possible callchains. Specifically the software events can end up running it with only preemption disabled.

This opens up a race vs perf_event_exit_event() and friends that will go and free various things the overflow path expects to be present, like the BPF program.

CVSS Base Scores

version 3.1