# s390/vfio_ccw: Limit the number of channel program segments

CVE record · `CVE-2026-80554`

- **Identifiers:** `CVE-2026-80554`
- **State:** Confirmed
- **Severity:** CVSS 9.3 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 26 Aug 2026
- **Updated:** 30 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 26 Aug 2026, 14:37 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.

## Critical

Critical, because:

- CVSS score 9.3: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before 2ce00bb19db13606cda79f4b7aae4d9775de3096` (git)
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before 15fb4559a7fdf0b8725e433a71cfd03a1313a48b` (git)
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before a1625f66eaa1200068a0e2c05bc90e65182fc4e3` (git)
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before 06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2` (git)
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before 4ee94790490ae8dcc97df8597f07836c8a81bbcf` (git)
  - affected: `0a19e61e6d4c6192077ead760ba0a2d350987d4c to before 5405c90d6a47b3014e74ee0618a162449abbbc93` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `4.12`
  - unaffected: `before 4.12` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.153 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.105 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.46 to 6.18.*, inclusive` (semver)
  - unaffected: `7.1.10 to 7.1.*, inclusive` (semver)
  - unaffected: `7.2 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

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

- **CISA KEV:** Not listed.
- **EPSS:** 0.0014, the 3rd 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 26 Aug 2026. New records show when each source confirmed them.

## Sources

- [CVE List: CVE-2026-80554](https://www.cve.org/CVERecord?id=CVE-2026-80554)
- [NVD: CVE-2026-80554](https://nvd.nist.gov/vuln/detail/CVE-2026-80554)

### References from the CNA

- <https://git.kernel.org/stable/c/2ce00bb19db13606cda79f4b7aae4d9775de3096>
- <https://git.kernel.org/stable/c/15fb4559a7fdf0b8725e433a71cfd03a1313a48b>
- <https://git.kernel.org/stable/c/a1625f66eaa1200068a0e2c05bc90e65182fc4e3>
- <https://git.kernel.org/stable/c/06f4d6e5a8af6c2072e8cd39dbc512c683ca7fb2>
- <https://git.kernel.org/stable/c/4ee94790490ae8dcc97df8597f07836c8a81bbcf>
- <https://git.kernel.org/stable/c/5405c90d6a47b3014e74ee0618a162449abbbc93>

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-2026-80554>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-80554/>. Everything for agents: <https://agentprime.io/llms.txt>.