# CVE-2026-23269 — Linux

> As of 2026-08-05, CVE-2026-23269 is a HIGH-severity vulnerability in Linux, CVSS v3.1 7.1, EPSS 0.1% (2.3th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-23269, most recently “Linux Kernel LPE Surge: Copy Fail (CVE-2026-31431), Dirty Frag/Fragnesia (CVE-2026-43284/CVE-2026-43500/CVE-2026-46300), and CrackArmor AppArmor Flaws vs. Defense-in-Depth Mitigations”.

**Last updated:** 2026-08-05

## What is CVE-2026-23269?

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.

The record classifies CVE-2026-23269 under weakness class [CWE-125](https://intel.threadlinqs.com/cwe/CWE-125). Its CVSS v3 base vector states that the flaw requires local access to the host, needs low-privilege credentials, needs no user interaction, and has high impact on confidentiality, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 221 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.1 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`)
- **EPSS (FIRST):** 0.1% probability of exploitation in the next 30 days, higher than 2.3% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 5.6/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-03-18, last modified 2026-08-05

## Is CVE-2026-23269 being exploited?

Weaponised exploit code for CVE-2026-23269 is publicly available. 1 public proof-of-concept repository is tracked for this identifier. It currently carries a trending score of 14 in the Threadlinqs vulnerability feed.

- [trickest/cve](https://github.com/trickest/cve/blob/main/2026/CVE-2026-23269.md) (trickest)

## Affected products and versions

- [Linux](https://intel.threadlinqs.com/vendors/linux): Linux

## How to fix CVE-2026-23269

The record marks a vendor fix as available for CVE-2026-23269. Patch reference: [https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da](https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da). Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

## Threat activity tracking CVE-2026-23269

1 tracked threat in the Threadlinqs corpus references CVE-2026-23269, either in the campaign’s CVE list or as an indicator on the campaign record.

- [Linux Kernel LPE Surge: Copy Fail (CVE-2026-31431), Dirty Frag/Fragnesia (CVE-2026-43284/CVE-2026-43500/CVE-2026-46300), and CrackArmor AppArmor Flaws vs. Defense-in-Depth Mitigations](https://intel.threadlinqs.com/threat/TL-2026-2424) — HIGH · 2026-05-29

## Sources

Enriched from CVE.org, NVD, FIRST EPSS, GitHub Security Advisories, public proof-of-concept repositories. Last verified by Threadlinqs on 2026-10-10. This product uses the NVD API but is not endorsed or certified by the NVD.

**Other references**

- [git.kernel.org](https://git.kernel.org/stable/c/f43eea8ae0102ea198da211ef7f5ce83725ecf19)
- [git.kernel.org (5487871b2b56c19d26936ed6fdc62652b30941df)](https://git.kernel.org/stable/c/5487871b2b56c19d26936ed6fdc62652b30941df)
- [git.kernel.org (5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a)](https://git.kernel.org/stable/c/5443c027ec16afa55b1b8a3e7a1ab2ea3c77767a)
- [git.kernel.org (07cf6320f40ea2ccfad63728cff34ecb309d03da)](https://git.kernel.org/stable/c/07cf6320f40ea2ccfad63728cff34ecb309d03da)
- [git.kernel.org (15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c)](https://git.kernel.org/stable/c/15c3eb8916e7db01cb246d04a1fe6f0fdc065b0c)

_Showing 5 of 9 recorded references._

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-23269
Full detection coverage and IOCs for threats exploiting CVE-2026-23269 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp