CVE-2026-64507

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux57631054fae6dcc9c892ae6310b58bbb6f6e5048 < cb27f3bf915cc0f20fc0c48da9059304e39ebd35affected
LinuxLinux57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 9354248fc1c33a844ca1872761f6668b393e8c37affected
LinuxLinux57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 8a4c8af9ae67eb072d90d1b339f14d27a82bd2a1affected
LinuxLinux57631054fae6dcc9c892ae6310b58bbb6f6e5048 < 52440e15d9628f8f239373c0f2e5e8f92feea2dfaffected
LinuxLinux57631054fae6dcc9c892ae6310b58bbb6f6e5048 < a3af84b0fa00ead01fcd0e28b5d773ff25990a0daffected
LinuxLinux5.18affected
LinuxLinux0 < 5.18unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.39 <= 6.18.*unaffected
LinuxLinux7.1.4 <= 7.1.*unaffected
LinuxLinux7.2-rc2 <= *unaffected

Weaknesses

References