What’s Vulnerable › Vulnerabilities

CVE-2026-23271: perf: Fix __perf_event_overflow() vs perf_remove_from_context() race

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-20 · updated 2026-10-19
• Weakness: CWE-362

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.

Affected products

• Linux kernel: from 2.6.31 before 6.1.167; from 6.2 before 6.6.130; from 6.7 before 6.12.77; from 6.13 before 6.18.17; from 6.19 before 6.19.7; 7.0-rc1 — fixed in 6.1.167, 6.12.77, 6.18.17, 6.19.7, 6.6.130

How to fix

Upgrade to a fixed version: Linux kernel 6.1.167, 6.12.77, 6.18.17, 6.19.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3f89b61dd504c5b6711de9759e053b082f9abf12
• https://git.kernel.org/stable/c/4df1a45819e50993cb351682a6ae8e7ed2d233a0
• https://git.kernel.org/stable/c/4f8d5812337871227bb2c98669a87c306a2f86ef
• https://git.kernel.org/stable/c/5c48fdc4b4623533d86e279f51531a7ba212eb87
• https://git.kernel.org/stable/c/bb190628fe5f2a73ba762a9972ba16c5e895f73e
• https://git.kernel.org/stable/c/c9bc1753b3cc41d0e01fbca7f035258b5f4db0ae
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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