# ocfs2: o2hb: quiesce negotiate handlers and timeout work

CVE record · `CVE-2026-90301`

- **Identifiers:** `CVE-2026-90301`
- **State:** Confirmed
- **Severity:** CVSS 8.1 High
- **Critical:** No
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 17 Sept 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 17 Sept 2026, 16:08 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: `34069b886f95356d68bf8315fa648c4ab3193cdd to before ed3c9aebd6bb5aa6ccc2a9177fab7a87ae895715` (git)
  - affected: `34069b886f95356d68bf8315fa648c4ab3193cdd to before b672d4de13247369c8dc394ba83f2a896d9cc25c` (git)
  - affected: `34069b886f95356d68bf8315fa648c4ab3193cdd to before f218d70f27bb326f5e9b2f33503e253851b3bafa` (git)
  - affected: `34069b886f95356d68bf8315fa648c4ab3193cdd to before 9d44822ba34d6035690f725f9de602744a6e1946` (git)
  - affected: `34069b886f95356d68bf8315fa648c4ab3193cdd to before b5a2907bdeced0949bcddc84b95ba7d4cb93841b` (git)
  - affected: `34069b886f95356d68bf8315fa648c4ab3193cdd to before 011291b70ba4832e136b7b581825b2bc0f525bf6` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.7`
  - unaffected: `before 4.7` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.160 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.114 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.57 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's ocfs2 heartbeat code (o2hb) has a use-after-free in its negotiate and timeout handling. Affected kernels run from commit 34069b886f95356d68bf8315fa648c4ab3193cdd until the fixing commits listed for each branch. A peer on the cluster can reach the vulnerable path, and the source reports kernel memory corruption. Upgrade to 6.1.191, 6.6.160, 6.12.114, 6.18.57, or a later release in those 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0059, the 48th 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 17 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-90301](https://www.cve.org/CVERecord?id=CVE-2026-90301)
- [NVD: CVE-2026-90301](https://nvd.nist.gov/vuln/detail/CVE-2026-90301)

### References from the CNA

- <https://git.kernel.org/stable/c/ed3c9aebd6bb5aa6ccc2a9177fab7a87ae895715>
- <https://git.kernel.org/stable/c/b672d4de13247369c8dc394ba83f2a896d9cc25c>
- <https://git.kernel.org/stable/c/f218d70f27bb326f5e9b2f33503e253851b3bafa>
- <https://git.kernel.org/stable/c/9d44822ba34d6035690f725f9de602744a6e1946>
- <https://git.kernel.org/stable/c/b5a2907bdeced0949bcddc84b95ba7d4cb93841b>
- <https://git.kernel.org/stable/c/011291b70ba4832e136b7b581825b2bc0f525bf6>

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-2026-90301>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-90301/>. Everything for agents: <https://agentprime.io/llms.txt>.