What’s Vulnerable › Vulnerabilities

CVE-2026-64507: x86/bugs: Enable IBPB flush on BPF JIT allocation

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-25 · updated 2026-08-19

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.

Affected products

• Linux kernel: 5.18 — fixed in 7.2

How to fix

Upgrade to a fixed version: Linux kernel 7.2. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/25dbcd31781e2bc3cd63d873af1fcd06f863a126
• https://git.kernel.org/stable/c/52440e15d9628f8f239373c0f2e5e8f92feea2df
• https://git.kernel.org/stable/c/8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1
• https://git.kernel.org/stable/c/9354248fc1c33a844ca1872761f6668b393e8c37
• https://git.kernel.org/stable/c/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d
• https://git.kernel.org/stable/c/cb27f3bf915cc0f20fc0c48da9059304e39ebd35

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