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Vulnerability record · CVE-2026-23269 · published 18 March 2026

CVE-2026-23269: Linux kernel out-of-bounds read vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.13% · top 97.8% CWE-125 · Out-of-bounds read
7.1CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
9References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da Patch
https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58 Patch
https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c Patch
https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184 Patch
https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a Patch
https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df Patch
https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816 Patch
https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19 Patch
https://www.qualys.com/2026/03/10/crack-armor.txt Third Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-23269), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.