# f2fs: limit recovery filename logging to stored length

CVE record · `CVE-2026-89838`

- **Identifiers:** `CVE-2026-89838`
- **State:** Confirmed
- **Severity:** CVSS 7.1 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 16 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 16 Sept 2026, 10:31 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: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 450ab2e5dbe0ef6e3ed73214256565f6f003d62a` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before e754120f8ede55cc773ade108cf7e5b17c859c46` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 7ab1780074943508534343e1e5e5ab0c9ef9dd7b` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 35c5abccd0924b02ad34126f562d93c8d75b0831` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 317d32e1a8deaf1c01c388badc667334c39e62ca` (git)
  - affected: `f356fe0cba0e3523e538987916bd2acedd4e6f41 to before 01027b2fcb74dade59fb833b51023f6593b6a9a2` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.11`
  - unaffected: `before 3.11` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.112 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.53 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.5 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 f2fs recovery code can read past its filename buffer and print adjacent inode data when logging a 255-byte name. Affected versions start at 3.11, and the source gives few details on what an attacker needs. Upgrade to Linux kernel 5.10.273, 5.15.224, 6.1.191, 6.6.160, or a later fixed release.

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

- 7.1 High, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0016, the 5th percentile, on 14 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89838](https://www.cve.org/CVERecord?id=CVE-2026-89838)
- [NVD: CVE-2026-89838](https://nvd.nist.gov/vuln/detail/CVE-2026-89838)

### References from the CNA

- <https://git.kernel.org/stable/c/b8ac8b14b9d92dd2e1cb05fa8994f41f701fbf28>
- <https://git.kernel.org/stable/c/450ab2e5dbe0ef6e3ed73214256565f6f003d62a>
- <https://git.kernel.org/stable/c/3d02c7c8446f5d6793ac67f93bf3f84bf24e3f25>
- <https://git.kernel.org/stable/c/e754120f8ede55cc773ade108cf7e5b17c859c46>
- <https://git.kernel.org/stable/c/7ab1780074943508534343e1e5e5ab0c9ef9dd7b>
- <https://git.kernel.org/stable/c/35c5abccd0924b02ad34126f562d93c8d75b0831>
- <https://git.kernel.org/stable/c/317d32e1a8deaf1c01c388badc667334c39e62ca>
- <https://git.kernel.org/stable/c/01027b2fcb74dade59fb833b51023f6593b6a9a2>

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-2026-89838>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89838/>. Everything for agents: <https://agentprime.io/llms.txt>.