CVE-2026-23269
apparmor: validate DFA start states are in bounds in unpack_pdb
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.
INFO
Published Date :
March 18, 2026, 6:16 p.m.
Last Modified :
May 29, 2026, 6:23 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Apply the Linux kernel patch.
- Update the system to the latest version.
- Validate DFA start states upon unpacking.
Public PoC/Exploit Available at Github
CVE-2026-23269 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-23269.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23269 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23269
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
5:24 PMProof-of-concept demonstrations for CrackArmor — multiple vulnerabilities in Linux AppArmor
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-23269 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23269 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
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Initial Analysis by [email protected]
May. 29, 2026
Action Type Old Value New Value Added CWE CWE-125 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.130 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.77 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.203 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.169 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.18 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.8 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.4 up to (excluding) 5.10.253 Added Reference Type kernel.org: https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19 Types: Patch Added Reference Type kernel.org: https://www.qualys.com/2026/03/10/crack-armor.txt Types: Third Party Advisory -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 18, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a Added Reference https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df Added Reference https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Apr. 02, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 25, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 23, 2026
Action Type Old Value New Value Added Reference https://www.qualys.com/2026/03/10/crack-armor.txt -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Mar. 18, 2026
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58 Added Reference https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c Added Reference https://git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184 Added Reference https://git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816