CVE-2026-64507 is a vulnerability in Linux Kernel
Published on July 25, 2026
x86/bugs: Enable IBPB flush on BPF JIT allocation
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.
Products Associated with CVE-2026-64507
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Affected Versions
Linux:- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below cb27f3bf915cc0f20fc0c48da9059304e39ebd35 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 9354248fc1c33a844ca1872761f6668b393e8c37 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1 is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below 52440e15d9628f8f239373c0f2e5e8f92feea2df is affected.
- Version 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 and below a3af84b0fa00ead01fcd0e28b5d773ff25990a0d is affected.
- Before 6.6.145 is affected.
- Before 6.12.97 is affected.
- Before 6.18.39 is affected.
- Before 7.1.4 is affected.
- Version 6.6.145, <= 6.6.* is unaffected.
- Version 6.12.97, <= 6.12.* is unaffected.
- Version 6.18.39, <= 6.18.* is unaffected.
- Version 7.1.4, <= 7.1.* is unaffected.
- Version 7.2-rc2, <= * is unaffected.