# KVM: s390: Fix length check \_\_import_wp_info()

CVE record · `CVE-2026-89926`

- **Identifiers:** `CVE-2026-89926`
- **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: `27291e2165b6de70c476b7b675308113edd69a60 to before 36d62dfb3cac66e6a97fd850a592c2ed56e35ba5` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before aef540194effd768bed0bd2e6a74fe135a3d7c3a` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before 71153d3262517e1c02c3a66aa5094f279b2d1454` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before fec89d327d9b2b669b5bbdac209386c6317c3722` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before b94ab9caa5d72c78226121cccff5e33f946da900` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before beb9c55af609c4c7308259d7191688c75a4e3d4a` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before 3fe801db90bdeefb0bbdda42d832846b53f64f8a` (git)
  - affected: `27291e2165b6de70c476b7b675308113edd69a60 to before 4c07680a467e2f7697245bcd11691bffb2a6f0ed` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `3.16`
  - unaffected: `before 3.16` (semver)
  - unaffected: `5.10.273 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: `6.12.110 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's KVM s390 breakpoint code is affected from version 3.16 until fixed in the 5.10.273, 5.15.221, 6.1.188 and 6.6.157 stable releases. A user-space program using KVM can supply a breakpoint length that bypasses the size check, triggering an oversized allocation and a kernel warning. Upgrade to 5.10.273, 5.15.221, 6.1.188, 6.6.157 or a later release.

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:** 0.0022, the 12th percentile, on 15 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-2026-89926](https://www.cve.org/CVERecord?id=CVE-2026-89926)
- [NVD: CVE-2026-89926](https://nvd.nist.gov/vuln/detail/CVE-2026-89926)

### References from the CNA

- <https://git.kernel.org/stable/c/36d62dfb3cac66e6a97fd850a592c2ed56e35ba5>
- <https://git.kernel.org/stable/c/aef540194effd768bed0bd2e6a74fe135a3d7c3a>
- <https://git.kernel.org/stable/c/71153d3262517e1c02c3a66aa5094f279b2d1454>
- <https://git.kernel.org/stable/c/fec89d327d9b2b669b5bbdac209386c6317c3722>
- <https://git.kernel.org/stable/c/b94ab9caa5d72c78226121cccff5e33f946da900>
- <https://git.kernel.org/stable/c/beb9c55af609c4c7308259d7191688c75a4e3d4a>
- <https://git.kernel.org/stable/c/3fe801db90bdeefb0bbdda42d832846b53f64f8a>
- <https://git.kernel.org/stable/c/4c07680a467e2f7697245bcd11691bffb2a6f0ed>

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-2026-89926>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-89926/>. Everything for agents: <https://agentprime.io/llms.txt>.