CVE-2026-23403

Name	CVE-2026-23403
Description	In the Linux kernel, the following vulnerability has been resolved: apparmor: fix memory leak in verify_header The function sets `ns = NULL` on every call, leaking the namespace string allocated in previous iterations when multiple profiles are unpacked. This also breaks namespace consistency checking since ns is always NULL when the comparison is made. Remove the incorrect assignment. The caller (aa_unpack) initializes *ns to NULL once before the loop, which is sufficient.
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)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
linux (PTS)	bullseye	5.10.223-1	vulnerable
	bullseye (security)	5.10.251-1	fixed
	bookworm	6.1.159-1	vulnerable
	bookworm (security)	6.1.164-1	fixed
	trixie	6.12.73-1	vulnerable
	trixie (security)	6.12.74-2	fixed
	forky	6.19.11-1	fixed
	sid	6.19.13-1	fixed

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

Package	Type	Release	Fixed Version
linux	source	bullseye	5.10.251-1
linux	source	bookworm	6.1.164-1
linux	source	trixie	6.12.74-2
linux	source	(unstable)	6.19.6-2

https://git.kernel.org/linus/e38c55d9f834e5b848bfed0f5c586aaf45acb825 (7.0-rc4)
NOTE: https://www.qualys.com/2026/03/10/crack-armor.txt