# f2fs: fix dentry folio leak in find_in_level

CVE record · `CVE-2026-89837`

- **Identifiers:** `CVE-2026-89837`
- **State:** Confirmed
- **Severity:** No CVSS score
- **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: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before d2011b371fcb9247b2ef4ea2d852401a6c82ab88` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before 3b8593f7965fcb22672d98b55ae2e9410ea3d9f7` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before b6c0e77d950bf80ab357e2b4b9667f4389ed417c` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before af9cc316d31371824de8d409260a2ab9759dd51c` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before aefb4b0f465b6f95fe02b52d1822a3fb4a9ae922` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before 93a3e6a4c9e726a13a935963e8dc43d181db1527` (git)
  - affected: `7ad08a58bf67594057362e45cbddd3e27e53e557 to before cca7d3e30bf30333314e31bc70b9a739f1342167` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `5.11`
  - unaffected: `before 5.11` (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: `6.18.51 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 filesystem is affected from version 5.11 until fixed. A dentry folio reference is leaked on an error path in directory lookup, so memory is not released, and the source gives few details on how an attacker would trigger it. Upgrade to kernel 5.15.224 or later, 6.1.191 or later, 6.6.160 or later, or 6.12.112 or later.

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:** 0.0023, the 13th 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-2026-89837](https://www.cve.org/CVERecord?id=CVE-2026-89837)
- [NVD: CVE-2026-89837](https://nvd.nist.gov/vuln/detail/CVE-2026-89837)

### References from the CNA

- <https://git.kernel.org/stable/c/d2011b371fcb9247b2ef4ea2d852401a6c82ab88>
- <https://git.kernel.org/stable/c/3b8593f7965fcb22672d98b55ae2e9410ea3d9f7>
- <https://git.kernel.org/stable/c/b6c0e77d950bf80ab357e2b4b9667f4389ed417c>
- <https://git.kernel.org/stable/c/af9cc316d31371824de8d409260a2ab9759dd51c>
- <https://git.kernel.org/stable/c/aefb4b0f465b6f95fe02b52d1822a3fb4a9ae922>
- <https://git.kernel.org/stable/c/93a3e6a4c9e726a13a935963e8dc43d181db1527>
- <https://git.kernel.org/stable/c/cca7d3e30bf30333314e31bc70b9a739f1342167>

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-2026-89837>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89837/>. Everything for agents: <https://agentprime.io/llms.txt>.