{
  "cveId": "CVE-2026-80554",
  "url": "https://patchblox.com/security/cve/CVE-2026-80554",
  "summary": "CVE-2026-80554 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-80554, released August 27, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "s390/vfio_ccw: Limit the number of channel program segments",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  s390/vfio_ccw: Limit the number of channel program segments  The processing of channel programs, and the CCWs within them, is done recursively. As such, there is an arbitrary (but not architectural) limit to the number of CCWs that can exist in a single channel program.  The vfio-ccw logic breaks these channel programs into segments whenever it encounters a Transfer-In-Channel (TIC) CCW, and the combined number of segments count towards the global limit. Impose an equivalent limit to the number of segments until such logic can be made non-recursive.",
  "published": "2026-08-26T15:17:09Z",
  "severity": "Moderate",
  "cvss": 9.3,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
  "epss": 0.00142,
  "epssPercentile": 0.03573,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-80554",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.105-1",
      "fix": "DEBIAN-CVE-2026-80554",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80554",
      "released": "2026-08-27T00:27:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.1.10-1",
      "fix": "DEBIAN-CVE-2026-80554",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80554",
      "released": "2026-08-27T00:27:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.107-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-80554",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80554",
      "released": "2026-08-27T00:27:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}