CVE-2026-23269

Summary

In the Linux kernel, the following vulnerability has been resolved:

apparmor: validate DFA start states are in bounds in unpack_pdb

Start states are read from untrusted data and used as indexes into the DFA state tables. The aa_dfa_next() function call in unpack_pdb() will access dfa->tables[YYTD_ID_BASE][start], and if the start state exceeds the number of states in the DFA, this results in an out-of-bound read.

================================================================== BUG: KASAN: slab-out-of-bounds in aa_dfa_next+0x2a1/0x360 Read of size 4 at addr ffff88811956fb90 by task su/1097 …

Reject policies with out-of-bounds start states during unpacking to prevent the issue.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < f43eea8ae0102ea198da211ef7f5ce83725ecf19affected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 5487871b2b56c19d26936ed6fdc62652b30941dfaffected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767aaffected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 07cf6320f40ea2ccfad63728cff34ecb309d03daaffected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0caffected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 0baadb0eece2c4d939db10d3c323b4652ac79a58affected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 3bb7db43e32190c973d4019037cedb7895920184affected
LinuxLinuxad5ff3db53c68c2f12936bc74ea5dfe0af943592 < 9063d7e2615f4a7ab321de6b520e23d370e58816affected
LinuxLinux3.4affected
LinuxLinux0 < 3.4unaffected
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