# RDMA/ucma: Lock the handler in ucma_write_cm_event()

CVE record · `CVE-2026-89507`

- **Identifiers:** `CVE-2026-89507`
- **State:** Confirmed
- **Severity:** CVSS 7.8 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: `a3c9d0fcd3715541bbf97da2ddde9d032e2fe6d5 to before 4f8bb11dd2ff365e7cff1c9964ab4607292d364e` (git)
  - affected: `a3c9d0fcd3715541bbf97da2ddde9d032e2fe6d5 to before 0be1955040a2eceed0ecfc387fdc92305411d273` (git)
  - affected: `a3c9d0fcd3715541bbf97da2ddde9d032e2fe6d5 to before f4cc21c6a8e9d392871477f9fd98d68e5ad80272` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.18`
  - unaffected: `before 6.18` (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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0013, the 2nd 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-2026-89507](https://www.cve.org/CVERecord?id=CVE-2026-89507)
- [NVD: CVE-2026-89507](https://nvd.nist.gov/vuln/detail/CVE-2026-89507)

### References from the CNA

- <https://git.kernel.org/stable/c/4f8bb11dd2ff365e7cff1c9964ab4607292d364e>
- <https://git.kernel.org/stable/c/0be1955040a2eceed0ecfc387fdc92305411d273>
- <https://git.kernel.org/stable/c/f4cc21c6a8e9d392871477f9fd98d68e5ad80272>

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-2026-89507>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

---

The web page: <https://agentprime.io/advisories/CVE-2026-89507/>. Everything for agents: <https://agentprime.io/llms.txt>.