CVE-2026-64507

Name	CVE-2026-64507
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6405-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	fixed
	bullseye (security)	5.10.259-1	fixed
	bookworm	6.1.176-1	vulnerable
	bookworm (security)	6.1.177-1	vulnerable
	trixie	6.12.94-1	vulnerable
	trixie (security)	6.12.100-1	fixed
	forky	7.1.3-1	vulnerable
	sid	7.1.5-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
linux	source	bullseye	(not affected)
linux	source	trixie	6.12.100-1	DSA-6405-1
linux	source	(unstable)	7.1.4-1

[bullseye] - linux <not-affected> (Vulnerable code not present)
https://git.kernel.org/linus/a3af84b0fa00ead01fcd0e28b5d773ff25990a0d (7.2-rc2)