# s390/vfio-ap: Fix NULL deref in status_show() during queue probe

CVE record · `CVE-2026-89955`

- **Identifiers:** `CVE-2026-89955`
- **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: `260f3ea141382386e97611e7c2029bc013088ab1 to before 10606c9af18baed75cd180b96ee695441aa15134` (git)
  - affected: `260f3ea141382386e97611e7c2029bc013088ab1 to before 31fa0a8a3c337ed2d200166d6926ab23c14f8b2e` (git)
  - affected: `260f3ea141382386e97611e7c2029bc013088ab1 to before e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9` (git)
  - affected: `260f3ea141382386e97611e7c2029bc013088ab1 to before 69632952aca04caa71e49953b6949fc04e788e67` (git)
  - affected: `260f3ea141382386e97611e7c2029bc013088ab1 to before 7db2511fc601ca3a6e3fb1bdce02261c3c3167c3` (git)
  - affected: `260f3ea141382386e97611e7c2029bc013088ab1 to before dd6f4ef6f8a37412909ad787c837332fb070159c` (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

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The Linux kernel s390 vfio-ap driver is affected in versions from 6.0 up to the fixes listed for each stable branch, which are 6.1.191, 6.6.157, 6.12.110, and 6.18.51. A NULL pointer dereference can occur in the status_show() sysfs handler when it reads the 'status' attribute while a queue is still being probed. The source gives few details on who can trigger the read. Upgrade to a fixed kernel version for your branch; no workaround is listed.

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

No source has published a CVSS score for this record yet.

- **CISA KEV:** Not listed.
- **EPSS:** 0.0021, the 10th 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-2026-89955](https://www.cve.org/CVERecord?id=CVE-2026-89955)
- [NVD: CVE-2026-89955](https://nvd.nist.gov/vuln/detail/CVE-2026-89955)

### References from the CNA

- <https://git.kernel.org/stable/c/10606c9af18baed75cd180b96ee695441aa15134>
- <https://git.kernel.org/stable/c/31fa0a8a3c337ed2d200166d6926ab23c14f8b2e>
- <https://git.kernel.org/stable/c/e102ce0f4af99dff769a4b1b4daa4cc6bd5ad2d9>
- <https://git.kernel.org/stable/c/69632952aca04caa71e49953b6949fc04e788e67>
- <https://git.kernel.org/stable/c/7db2511fc601ca3a6e3fb1bdce02261c3c3167c3>
- <https://git.kernel.org/stable/c/dd6f4ef6f8a37412909ad787c837332fb070159c>

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-2026-89955>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89955/>. Everything for agents: <https://agentprime.io/llms.txt>.