# s390/vfio-ap: Fix dereference matrix_mdev->kvm without checking for NULL

CVE record · `CVE-2026-89958`

- **Identifiers:** `CVE-2026-89958`
- **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, 10:32 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: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before 2fbe430fe40bc5adb7e439d0136d2c5fe34613ba` (git)
  - affected: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before 5e932abfcce6189d067fffb0eb8214443bc04374` (git)
  - affected: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before 334b435b951353f934d5110c4630e0cb58d2f9a7` (git)
  - affected: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before 178ea7a1c2c3c0c01d14b8f60aa35f1e0cdc6b78` (git)
  - affected: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before 4f7e869d0db24ae07b4c888fd3bc21554eef775d` (git)
  - affected: `eeb386aeb5b7c8d2dae6a3ba49255d8a97803182 to before d50346801b4f144e42b49cd4f1496010498ab114` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `6.0`
  - unaffected: `before 6.0` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.157 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.110 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

## 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:** 0.0022, the 11th 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 16 Sept 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-89958](https://www.cve.org/CVERecord?id=CVE-2026-89958)
- [NVD: CVE-2026-89958](https://nvd.nist.gov/vuln/detail/CVE-2026-89958)

### References from the CNA

- <https://git.kernel.org/stable/c/2fbe430fe40bc5adb7e439d0136d2c5fe34613ba>
- <https://git.kernel.org/stable/c/5e932abfcce6189d067fffb0eb8214443bc04374>
- <https://git.kernel.org/stable/c/334b435b951353f934d5110c4630e0cb58d2f9a7>
- <https://git.kernel.org/stable/c/178ea7a1c2c3c0c01d14b8f60aa35f1e0cdc6b78>
- <https://git.kernel.org/stable/c/4f7e869d0db24ae07b4c888fd3bc21554eef775d>
- <https://git.kernel.org/stable/c/d50346801b4f144e42b49cd4f1496010498ab114>

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-2026-89958>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89958/>. Everything for agents: <https://agentprime.io/llms.txt>.