CVE-2026-23269: apparmor: validate DFA start states are in bounds in unpack_pdb
Noroxi assessment
Priority: Monitor (action score 28/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.13% (FIRST EPSS).
- Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
- Fixed version: Linux Linux 07cf6320f40ea2ccfad63728cff34ecb309d03da, 0baadb0eece2c4d939db10d3c323b4652ac79a58, 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1.
Low priority for now. Upgrade to Linux Linux 07cf6320f40ea2ccfad63728cff34ecb309d03da, 0baadb0eece2c4d939db10d3c323b4652ac79a58, 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c; azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 6.6.130.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
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.
- Published
- Mar 18, 2026
- Updated
- Aug 5, 2026
- EPSS
- 0.1% · 3th percentile
- CWE
- CWE-125
Report tools
Action score
28
Low priority for now.
- CVSS
- 28 / 40 · 7.1 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.1
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
Is your version affected? Check itNoroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel3.4 and later · before 5.10.253
- linux linux kernel5.11 and later · before 5.15.203
- linux linux kernel5.16 and later · before 6.1.169
- linux linux kernel6.2 and later · before 6.6.130
- linux linux kernel6.7 and later · before 6.12.77
- linux linux kernel6.13 and later · before 6.18.18
- linux linux kernel6.19 and later · before 6.19.8
- linux linux kernel7.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 3.4affected
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before f43eea8ae0102ea198da211ef7f5ce83725ecf19affected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 5487871b2b56c19d26936ed6fdc62652b30941dfaffected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767aaffected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 07cf6320f40ea2ccfad63728cff34ecb309d03daaffected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0caffected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 0baadb0eece2c4d939db10d3c323b4652ac79a58affected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 3bb7db43e32190c973d4019037cedb7895920184affected · git
- ad5ff3db53c68c2f12936bc74ea5dfe0af943592 and later · before 9063d7e2615f4a7ab321de6b520e23d370e58816affected · git
- before 3.4not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.164-1 | 6.1.164-1 |
| Debian:13 | linux | before 6.12.74-2 | 6.12.74-2 |
| Debian:14 | linux | before 6.19.6-2 | 6.19.6-2 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-64kb | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-docs | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-obs-build | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-source | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-syms | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-64kb | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-docs | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-obs-build | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
| SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS | kernel-syms | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
| SUSE:Linux Enterprise Live Patching 15 SP4 | kernel-livepatch-SLE15-SP4_Update_49 | before 1-150400.9.3.1 | 1-150400.9.3.1 |
| SUSE:Linux Enterprise Live Patching 15 SP5 | kernel-livepatch-SLE15-SP5_Update_36 | before 1-150500.11.5.1 | 1-150500.11.5.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-default | before 6.4.0-150600.23.112.1 | 6.4.0-150600.23.112.1 |
| SUSE:Linux Enterprise Live Patching 15 SP6 | kernel-livepatch-SLE15-SP6_Update_26 | before 1-150600.13.3.1 | 1-150600.13.3.1 |
| SUSE:Linux Enterprise Micro 5.2 | kernel-rt | before 5.3.18-150300.238.1 | 5.3.18-150300.238.1 |
| SUSE:Linux Enterprise Micro 5.2 | kernel-source-rt | before 5.3.18-150300.238.1 | 5.3.18-150300.238.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default | before 5.14.21-150400.24.197.1 | 5.14.21-150400.24.197.1 |
| SUSE:Linux Enterprise Micro 5.3 | kernel-default-base | before 5.14.21-150400.24.197.1.150400.24.100.1 | 5.14.21-150400.24.197.1.150400.24.100.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-default-base | before 5.14.21-150500.55.141.1.150500.6.69.2 | 5.14.21-150500.55.141.1.150500.6.69.2 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-rt | before 5.14.21-150500.13.124.1 | 5.14.21-150500.13.124.1 |
| SUSE:Linux Enterprise Micro 5.5 | kernel-source | before 5.14.21-150500.55.141.1 | 5.14.21-150500.55.141.1 |
+10
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe…KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
Published before and after this one in the same product
- ← EarlierCVE-2026-23267Mar 18, 2026 · f2fs: fix IS_CHECKPOINTED flag inconsistency issue caused by concurrent atomic commit and checkpoint writes22Monitor
- ← EarlierCVE-2026-23268Mar 18, 2026 · apparmor: fix unprivileged local user can do privileged policy management31Monitor
- Later →CVE-2025-71268Mar 18, 2026 · btrfs: fix reservation leak in some error paths when inserting inline extent22Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 07cf6320f40ea2ccfad63728cff34ecb309d03da | Vendor (CNA) |
| Linux Linux | 0baadb0eece2c4d939db10d3c323b4652ac79a58 | Vendor (CNA) |
| Linux Linux | 15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c | Vendor (CNA) |
| Linux Linux | 3bb7db43e32190c973d4019037cedb7895920184 | Vendor (CNA) |
| Linux Linux | 5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a | Vendor (CNA) |
| Linux Linux | 5487871b2b56c19d26936ed6fdc62652b30941df | Vendor (CNA) |
| Linux Linux | 9063d7e2615f4a7ab321de6b520e23d370e58816 | Vendor (CNA) |
| Linux Linux | f43eea8ae0102ea198da211ef7f5ce83725ecf19 | Vendor (CNA) |
| azl3 kernel 6.6.126.1-1 on Azure Linux 3.0 | 6.6.130.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.164-1 · Debian:12 | Package registry (OSV) |
| suse:kernel-64kb | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-default | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-default-base | 5.14.21-150400.24.197.1.150400.24.100.1 · SUSE:Linux Enterprise Micro 5.3 | Package registry (OSV) |
| suse:kernel-docs | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP4_Update_49 | 1-150400.9.3.1 · SUSE:Linux Enterprise Live Patching 15 SP4 | Package registry (OSV) |
| suse:kernel-livepatch-SLE15-SP5_Update_36 | 1-150500.11.5.1 · SUSE:Linux Enterprise Live Patching 15 SP5 | Package registry (OSV) |
| suse:kernel-obs-build | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-rt | 5.3.18-150300.238.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-source | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-source-rt | 5.3.18-150300.238.1 · SUSE:Linux Enterprise Micro 5.2 | Package registry (OSV) |
| suse:kernel-syms | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS | Package registry (OSV) |
| suse:kernel-zfcpdump | 5.14.21-150400.24.197.1 · SUSE:Linux Enterprise Server 15 SP4-LTSS | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (8 more)Show less
- git.kernel.org/stable/c/0baadb0eece2c4d939db10d3c323b4652ac79a58
- git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c
- git.kernel.org/stable/c/3bb7db43e32190c973d4019037cedb7895920184
- git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a
- git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df
- git.kernel.org/stable/c/9063d7e2615f4a7ab321de6b520e23d370e58816
- git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19
- www.qualys.com/2026/03/10/crack-armor.txt
Vendor advisories and official records. Exploit/PoC links are deliberately left out.