Linux Kernel up to 6.12.76/6.18.16/6.19.6/7.0-rc1 __perf_event_overflow race condition

CVSS Meta Temp Score
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CTI Interest Score
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6.1$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.12.76/6.18.16/6.19.6/7.0-rc1. This vulnerability affects the function __perf_event_overflow. The manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2026-23271. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.12.76/6.18.16/6.19.6/7.0-rc1. It has been rated as critical. Using CWE to declare the problem leads to CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. The impact remains unknown. The summary by CVE is:

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.

The advisory is shared at git.kernel.org. The identification of this vulnerability is CVE-2026-23271 since 01/13/2026. The exploitation is known to be difficult. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 303176 (Linux Distros Unpatched Vulnerability : CVE-2026-23271), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.77, 6.18.17, 6.19.7 or 7.0-rc2 eliminates this vulnerability. Applying the patch 5c48fdc4b4623533d86e279f51531a7ba212eb87/3f89b61dd504c5b6711de9759e053b082f9abf12/bb190628fe5f2a73ba762a9972ba16c5e895f73e/c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (303176) and CERT Bund (WID-SEC-2026-0809). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Google Cloud Platform
  • Amazon Linux 2
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • Open Source Linux Kernel

Productinfo

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Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.2
VulDB Meta Temp Score: 6.1

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Race condition
CWE: CWE-362
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 303176
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-23271

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.77/6.18.17/6.19.7/7.0-rc2
Patch: 5c48fdc4b4623533d86e279f51531a7ba212eb87/3f89b61dd504c5b6711de9759e053b082f9abf12/bb190628fe5f2a73ba762a9972ba16c5e895f73e/c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae

Timelineinfo

01/13/2026 CVE reserved
03/20/2026 +66 days Advisory disclosed
03/20/2026 +0 days VulDB entry created
07/16/2026 +118 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-23271 (🔒)
GCVE (CVE): GCVE-0-2026-23271
GCVE (VulDB): GCVE-100-352025
CERT Bund: WID-SEC-2026-0809 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 03/20/2026 09:47
Updated: 07/16/2026 14:33
Changes: 03/20/2026 09:47 (57), 03/20/2026 16:11 (7), 03/23/2026 16:50 (2), 03/26/2026 12:45 (1), 05/04/2026 07:14 (1), 05/23/2026 03:32 (11), 06/18/2026 16:09 (1), 07/16/2026 14:33 (2)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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