apparmor: validate DFA start states are in bounds in unpack_pdb
Summary
| CVE | CVE-2026-23269 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-03-18 18:16:25 UTC |
| Updated | 2026-04-02 15:16:27 UTC |
| 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. |
Risk And Classification
Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | Secondary | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
| 3.1 | CNA | DECLARED | 7.1 | HIGH | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H |
CVSS v3.1 Breakdown
Attack Vector
LocalAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
UnchangedConfidentiality
HighIntegrity
NoneAvailability
HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected ad5ff3db53c68c2f12936bc74ea5dfe0af943592 07cf6320f40ea2ccfad63728cff34ecb309d03da git | Not specified |
| CNA | Linux | Linux | affected ad5ff3db53c68c2f12936bc74ea5dfe0af943592 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c git | Not specified |
| CNA | Linux | Linux | affected ad5ff3db53c68c2f12936bc74ea5dfe0af943592 0baadb0eece2c4d939db10d3c323b4652ac79a58 git | Not specified |
| CNA | Linux | Linux | affected ad5ff3db53c68c2f12936bc74ea5dfe0af943592 3bb7db43e32190c973d4019037cedb7895920184 git | Not specified |
| CNA | Linux | Linux | affected ad5ff3db53c68c2f12936bc74ea5dfe0af943592 9063d7e2615f4a7ab321de6b520e23d370e58816 git | Not specified |
| CNA | Linux | Linux | affected 3.4 | Not specified |
| CNA | Linux | Linux | unaffected 3.4 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.130 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.77 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.18 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.19.8 6.19.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0-rc4 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| www.qualys.com/2026/03/10/crack-armor.txt | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | www.qualys.com | |
| git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.