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CVE-2026-64507

UnknownEPSS 0.16%

Last modified

CVE-2026-64507 is a vulnerability of currently unknown severity. In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Enable IBPB flush on BPF JIT allocation Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. EPSS estimates a 0.16% chance of exploitation in the next 30 days.

Description

In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Enable IBPB flush on BPF JIT allocation Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence. This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.

Metrics

EPSS Probability
0.16%

5.3th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < cb27f3bf915cc0f20fc0c48da9059304e39ebd35; >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 9354248fc1c33a844ca1872761f6668b393e8c37; >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1; >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < 52440e15d9628f8f239373c0f2e5e8f92feea2df; >= 57631054fae6dcc9c892ae6310b58bbb6f6e5048, < a3af84b0fa00ead01fcd0e28b5d773ff25990a0d
LinuxLinux5.18

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-64507?
In the Linux kernel, the following vulnerability has been resolved: x86/bugs: Enable IBPB flush on BPF JIT allocation Enable hardening against JIT spraying when Spectre-v2 mitigations are in use. Specifically, issue an IBPB flush on BPF JIT memory reuse. Skip enabling the IBPB flush if the BPF dispatcher is already using a retpoline sequence. This hardening applies only when BPF-JIT is in use. Guard the enabling under CONFIG_BPF_JIT so that bugs.c still builds with CONFIG_BPF_JIT=n.
How severe is CVE-2026-64507?
Severity scoring for CVE-2026-64507 is pending analysis. The EPSS model estimates a 0.16% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64507?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST