# ocfs2: validate directory-index entry counts when reading metadata

CVE record · `CVE-2026-89492`

- **Identifiers:** `CVE-2026-89492`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:43 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.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before 3f28574dd59672ac47f3110c9a8ead703ec021c0` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before 3497aa757788de5d904f41814f1df0b292a8be09` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before 47b8152ed7709f7ef30b398fb0bfe4b452dd0495` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before aad3129b8e915d0ff492bb7517d825d8490cfdd9` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before 5e661f55ca8568471fce558effe81cca112f5cb2` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before fcfcba8fe17dbf2c8805690b8cc25e32d81249a4` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before b8a5c0c32df2c5b685ceef76ac77e37c7e1dc3ed` (git)
  - affected: `9b7895efac906d66d19856194e1ba61f37e231a4 to before bc70726ddad53c7e9a9a85915bf2415b0d4f42f9` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.30`
  - unaffected: `before 2.6.30` (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: `6.12.111 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.51 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.4 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's ocfs2 filesystem code, from 2.6.30 onward, can read past the end of directory-index metadata blocks. An attacker who can get a crafted ocfs2 image mounted can trigger this by accessing an indexed directory, causing an out-of-bounds memory read. Upgrade to 5.10.273, 5.15.224, 6.1.191, 6.6.160, or a later release in those stable 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0071, the 54th 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 11 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89492](https://www.cve.org/CVERecord?id=CVE-2026-89492)
- [NVD: CVE-2026-89492](https://nvd.nist.gov/vuln/detail/CVE-2026-89492)

### References from the CNA

- <https://git.kernel.org/stable/c/3f28574dd59672ac47f3110c9a8ead703ec021c0>
- <https://git.kernel.org/stable/c/3497aa757788de5d904f41814f1df0b292a8be09>
- <https://git.kernel.org/stable/c/47b8152ed7709f7ef30b398fb0bfe4b452dd0495>
- <https://git.kernel.org/stable/c/aad3129b8e915d0ff492bb7517d825d8490cfdd9>
- <https://git.kernel.org/stable/c/5e661f55ca8568471fce558effe81cca112f5cb2>
- <https://git.kernel.org/stable/c/fcfcba8fe17dbf2c8805690b8cc25e32d81249a4>
- <https://git.kernel.org/stable/c/b8a5c0c32df2c5b685ceef76ac77e37c7e1dc3ed>
- <https://git.kernel.org/stable/c/bc70726ddad53c7e9a9a85915bf2415b0d4f42f9>

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-2026-89492>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89492/>. Everything for agents: <https://agentprime.io/llms.txt>.