CVE-2026-23404

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < ea854f032190cc9f26dc4a0e727090c89e55e342affected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < 4fdc847b107321dec22bf8ecd6019b7af76d7886affected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < b36a04284d0208be94e5e401409caa00e2bf1be1affected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < 33959a491e9fd557abfa5fce5ae4637d400915d3affected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < 999bd704b0b641527a5ed46f0d969deff8cfa68baffected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < 7eade846e013cbe8d2dc4a484463aa19e6515c7faffected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < a6a941a1294ac5abe22053dc501d25aed96e48feaffected
LinuxLinuxc88d4c7b049e87998ac0a9f455aa545cc895ef92 < ab09264660f9de5d05d1ef4e225aa447c63a8747affected
LinuxLinux2.6.36affected
LinuxLinux0 < 2.6.36unaffected
LinuxLinux5.10.253 <= 5.10.*unaffected
LinuxLinux5.15.203 <= 5.15.*unaffected
LinuxLinux6.1.169 <= 6.1.*unaffected
LinuxLinux6.6.130 <= 6.6.*unaffected
LinuxLinux6.12.77 <= 6.12.*unaffected
LinuxLinux6.18.18 <= 6.18.*unaffected
LinuxLinux6.19.8 <= 6.19.*unaffected
LinuxLinux7.0 <= *unaffected

Weaknesses

References