CVE-2026-23404

Description

In the Linux kernel, the following vulnerability has been resolved: apparmor: replace recursive profile removal with iterative approach The profile removal code uses recursion when removing nested profiles, which can lead to kernel stack exhaustion and system crashes. Reproducer: $ pf='a'; for ((i=0; i<1024; i++)); do echo -e "profile $pf { \n }" | apparmor_parser -K -a; pf="$pf//x"; done $ echo -n a > /sys/kernel/security/apparmor/.remove Replace the recursive __aa_profile_list_release() approach with an iterative approach in __remove_profile(). The function repeatedly finds and removes leaf profiles until the entire subtree is removed, maintaining the same removal semantic without recursion.

References

• https://git.kernel.org/stable/c/33959a491e9fd557abfa5fce5ae4637d400915d3
• https://git.kernel.org/stable/c/7eade846e013cbe8d2dc4a484463aa19e6515c7f
• https://git.kernel.org/stable/c/999bd704b0b641527a5ed46f0d969deff8cfa68b
• https://git.kernel.org/stable/c/a6a941a1294ac5abe22053dc501d25aed96e48fe
• https://git.kernel.org/stable/c/ab09264660f9de5d05d1ef4e225aa447c63a8747