In the Linux kernel, the following vulnerability has been resolved: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race Make sure… (CVE-2026-23271)
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.
AI Analysis
Technical Summary
CVE-2026-23271 addresses a race condition in the Linux kernel perf subsystem where __perf_event_overflow() did not consistently run with interrupts disabled, allowing a race against perf_remove_from_context() and related functions that free resources expected by the overflow path, such as BPF programs. This could lead to use-after-free conditions and potentially compromise system integrity. The vulnerability affects multiple Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions. The issue has been resolved in updated kernel releases, with patches available from Ubuntu advisories USN-8567-1 and USN-8574-1. Due to ABI changes, kernel updates require recompilation and reinstallation of third-party kernel modules.
Potential Impact
The vulnerability allows a local attacker with limited privileges to trigger a race condition that can lead to use-after-free scenarios within the perf subsystem, potentially causing system compromise with high confidentiality, integrity, and availability impact. The CVSS v3.1 score is 7.8 (High), reflecting the significant risk of privilege escalation or system instability if exploited.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributions. Users should update their Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by their vendor. After updating, a system reboot is required to apply the changes. Due to an ABI change in the kernel update, all third-party kernel modules must be recompiled and reinstalled to ensure compatibility. Follow vendor-specific update instructions carefully to fully mitigate the vulnerability.
In the Linux kernel, the following vulnerability has been resolved: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race Make sure… (CVE-2026-23271)
Description
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 v3.1
Score 7.8high
Affected software
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protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingpkg:deb/ubuntu/[email protected]?arch=source&distro=questingRun on your own infrastructure? 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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-23271 addresses a race condition in the Linux kernel perf subsystem where __perf_event_overflow() did not consistently run with interrupts disabled, allowing a race against perf_remove_from_context() and related functions that free resources expected by the overflow path, such as BPF programs. This could lead to use-after-free conditions and potentially compromise system integrity. The vulnerability affects multiple Linux kernel versions prior to 6.8.0-1061.64~22.04.1 and similar versions. The issue has been resolved in updated kernel releases, with patches available from Ubuntu advisories USN-8567-1 and USN-8574-1. Due to ABI changes, kernel updates require recompilation and reinstallation of third-party kernel modules.
Potential Impact
The vulnerability allows a local attacker with limited privileges to trigger a race condition that can lead to use-after-free scenarios within the perf subsystem, potentially causing system compromise with high confidentiality, integrity, and availability impact. The CVSS v3.1 score is 7.8 (High), reflecting the significant risk of privilege escalation or system instability if exploited.
Mitigation Recommendations
A patch is available and has been released by Ubuntu and other Linux distributions. Users should update their Linux kernel to versions 6.8.0-1061.64~22.04.1 or later as provided by their vendor. After updating, a system reboot is required to apply the changes. Due to an ABI change in the kernel update, all third-party kernel modules must be recompiled and reinstalled to ensure compatibility. Follow vendor-specific update instructions carefully to fully mitigate the vulnerability.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-23271
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10"]
- Cvss Version
- 4.0
Threat ID: 6a5b62dc2d1edb114c8a22f9
Added to database: 07/18/2026, 11:26:21 UTC
Last enriched: 08/01/2026, 06:51:58 UTC
Last updated: 09/10/2026, 19:36:52 UTC
Views: 31
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