Out-of-bounds read/write in Linux kernel AppArmor verify_dfa()
CVE-2026-23407 is a Linux kernel AppArmor vulnerability in verify_dfa(). The function validated DEFAULT_TABLE bounds only when a DFA state was not differentially encoded. While traversing a differential encoding chain, verify_dfa() read k = DEFAULT_TABLE[j] and then used k as an array index without validating that k was less than state_count. A malformed DFA containing a DEFAULT_TABLE entry greater than or equal to state_count can therefore trigger out-of-bounds memory access during DFA verification and unpacking. The provided KASAN trace shows a slab-out-of-bounds condition in verify_dfa(), reached through aa_dfa_unpack(), unpack_pdb(), aa_unpack(), aa_replace_profiles(), and policy_update() during profile loading/replacement.
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