# ocfs2: validate rl_used against rl_count in refcount block validator

CVE record · `CVE-2026-89493`

- **Identifiers:** `CVE-2026-89493`
- **State:** Confirmed
- **Severity:** CVSS 8.8 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 11 Sept 2026
- **Updated:** 19 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.

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before f882e9e32d017a6569b2996c63ba3864717788e6` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before 5593b63028cb43a6cda75a65ce1db95f00ea6857` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before c8b02f4ee91e757b3fff556c7168b24b7ae55132` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before 97584e93fc49a2d59252ac60467e9279f11b1b5b` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before af56e90cb546cb0c47bef059335365283f61d6a4` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before 0761d2c9494424469a0d30a9da3496ca010b0b2d` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before 04ead708e13ddcb9c39319cbe02a18cef99cb823` (git)
  - affected: `f2c870e3b12e38da6d9b5b17c4c8ae56a0ed68e4 to before 4ca62df6bc0708947b48da3f6a712ecb8e73929c` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.32`
  - unaffected: `before 2.6.32` (semver)
  - unaffected: `5.10.270 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.221 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.188 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.109 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.50 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

## 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0065, the 51st 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-2026-89493](https://www.cve.org/CVERecord?id=CVE-2026-89493)
- [NVD: CVE-2026-89493](https://nvd.nist.gov/vuln/detail/CVE-2026-89493)

### References from the CNA

- <https://git.kernel.org/stable/c/f882e9e32d017a6569b2996c63ba3864717788e6>
- <https://git.kernel.org/stable/c/5593b63028cb43a6cda75a65ce1db95f00ea6857>
- <https://git.kernel.org/stable/c/c8b02f4ee91e757b3fff556c7168b24b7ae55132>
- <https://git.kernel.org/stable/c/97584e93fc49a2d59252ac60467e9279f11b1b5b>
- <https://git.kernel.org/stable/c/af56e90cb546cb0c47bef059335365283f61d6a4>
- <https://git.kernel.org/stable/c/0761d2c9494424469a0d30a9da3496ca010b0b2d>
- <https://git.kernel.org/stable/c/04ead708e13ddcb9c39319cbe02a18cef99cb823>
- <https://git.kernel.org/stable/c/4ca62df6bc0708947b48da3f6a712ecb8e73929c>

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-2026-89493>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89493/>. Everything for agents: <https://agentprime.io/llms.txt>.