# ext4: fix circular lock dependency in ext4_ext_migrate

CVE record · `CVE-2026-93269`

- **Identifiers:** `CVE-2026-93269`
- **State:** Confirmed
- **Severity:** No CVSS score
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 24 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 24 Sept 2026, 15:52 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before f204882d5eaca09f7848f081c9c9b5bbf2234895` (git)
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before 452950461241dfed8b1d32e94b227db38c99c5af` (git)
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before ada23457d4748d6e9c36c6f871fc29a6f558c48c` (git)
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before e4223231b6860141813637a6413c2371ae4d6fa8` (git)
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before 32f7ab52875ec7f800ca67e7176e5743a84baddf` (git)
  - affected: `cb85f4d23f794e24127f3e562cb3b54b0803f456 to before a897682793eba5de51ee6f3152760374afa629cf` (git)
  - affected: `eb799e163dc2bc1ea0a4820b66f79d32a5e907df` (git)
  - affected: `bcc1eab71a67c46b9e24544ac7923f44444174ce` (git)
  - affected: `8cf20fb73e73a4c4df0328b5297842c5ef34fdd9` (git)
  - affected: `e5d25003d059649e18a249635ed5ca7a7b1de5ad` (git)
  - affected: `69f8a7991fd93c49096ddd11574db3e7df238b7b` (git)
  - affected: `4.9.215 to before 4.10` (semver)
  - and 4 more
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.6`
  - unaffected: `before 5.6` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.52 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.6 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel ext4 filesystem code, from 5.6 until the fixes, can deadlock through a circular lock dependency in ext4_ext_migrate. The source gives few details on what triggers it or who can. Upgrade to 6.1.191, 6.6.157, 6.12.110, 6.18.52, or a later release in the matching series.

Written 12 Nov 2026.

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0020, the 9th percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

This record came from the full history of the CVE Program, published 24 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-93269](https://www.cve.org/CVERecord?id=CVE-2026-93269)
- [NVD: CVE-2026-93269](https://nvd.nist.gov/vuln/detail/CVE-2026-93269)

### References from the CNA

- <https://git.kernel.org/stable/c/f204882d5eaca09f7848f081c9c9b5bbf2234895>
- <https://git.kernel.org/stable/c/452950461241dfed8b1d32e94b227db38c99c5af>
- <https://git.kernel.org/stable/c/ada23457d4748d6e9c36c6f871fc29a6f558c48c>
- <https://git.kernel.org/stable/c/e4223231b6860141813637a6413c2371ae4d6fa8>
- <https://git.kernel.org/stable/c/32f7ab52875ec7f800ca67e7176e5743a84baddf>
- <https://git.kernel.org/stable/c/a897682793eba5de51ee6f3152760374afa629cf>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-93269>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-93269/>. Everything for agents: <https://agentprime.io/llms.txt>.