CVE-2026-23269
Published: March 20, 2026Last modified: March 20, 2026
Description
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 7.1 |
| Attack Vector | LOCAL |
| Attack complexity | LOW |
| Privileges required | LOW |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | HIGH |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Vulnerable (6.1.164-r0) |
| 25 LTS | linux-lts | Vulnerable (6.12.74-r0) | |
| Stream | linux-lts | Vulnerable (6.12.76-r0) |
References
- https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da
- https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58
- https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c
- https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184
- https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816
- https://www.qualys.com/2026/03/10/crack-armor.txt