CVE-2026-23271
Race Condition in Linux Kernel perf Event Overflow Handling
Publication date: 2026-03-20
Last updated on: 2026-04-02
Assigner: kernel.org
Description
Description
CVSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linux | linux_kernel | * |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in the Linux kernel's perf subsystem. It involves a race condition between the __perf_event_overflow() function and perf_remove_from_context() (and related functions). Specifically, __perf_event_overflow() may run with interrupts disabled only in some callchains, but in others it runs with only preemption disabled. This inconsistency can cause a race condition with perf_event_exit_event() and similar functions that free resources expected to be present during the overflow path, such as the BPF program.
How can this vulnerability impact me? :
The race condition can lead to use-after-free or other memory corruption issues within the perf subsystem of the Linux kernel. This could potentially cause system instability, crashes, or unexpected behavior when performance events are being handled. It may also affect the reliability of BPF programs that rely on these events.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
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How can this vulnerability be detected on my network or system? Can you suggest some commands?
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What immediate steps should I take to mitigate this vulnerability?
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