CVE-2026-80551

Full vulnerability record from the local CVENow database.
Description

In the Linux kernel, the following vulnerability has been resolved: s390/vfio_ccw: Ensure first IDAW remains constant The first IDAW in a list does not need to be on a 2K/4K boundary like all others, and so is read separately to accurately calculate the size of the buffer needed to read the full IDAL. Verify that the address found in the first IDAW is unchanged between reads, to ensure a consistent set of IDAWs being worked with.
Severity
CRITICAL
CVSS score
9.3 (v3.1)
Vulnerability status
Received
Source identifier
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Published
2026-08-26 15:17:09.610000
Last modified
2026-10-30 13:20:06.703000
View original CVE JSON
{
  "id": "CVE-2026-80551",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-26T15:17:09.610",
  "lastModified": "2026-10-30T13:20:06.703",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Ensure first IDAW remains constant\n\nThe first IDAW in a list does not need to be on a 2K/4K boundary\nlike all others, and so is read separately to accurately calculate\nthe size of the buffer needed to read the full IDAL.\n\nVerify that the address found in the first IDAW is unchanged between\nreads, to ensure a consistent set of IDAWs being worked with."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/s390/cio/vfio_ccw_cp.c",
            "drivers/s390/cio/vfio_ccw_cp.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "5b7c23440343e336259cd45017cc901a744c41b0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "460b977a4e71cc319fdadf91c193ec3beaa57263",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "0d46c2565f173bcddcdcaf44a4f69789a20535e2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "08ef2a82115690d6e229615872ac1731af732497",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "fc59e9482117ebdccd6dc7fa8082f8b980fd021e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "01aa26c672c0eb771de4aaa2a8ccf6055778887b",
              "lessThan": "565bef268d75bf7df665bce6923a88cd0eb74592",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/s390/cio/vfio_ccw_cp.c",
            "drivers/s390/cio/vfio_ccw_cp.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.3",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.3",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.154",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.105",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.46",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.10",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
          "baseScore": 9.3,
          "baseSeverity": "CRITICAL",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "NONE",
          "userInteraction": "NONE",
          "scope": "CHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 2.5,
        "impactScore": 6.0
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-10-16T19:17:11.083121Z",
          "id": "CVE-2026-80551",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/08ef2a82115690d6e229615872ac1731af732497",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/0d46c2565f173bcddcdcaf44a4f69789a20535e2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/460b977a4e71cc319fdadf91c193ec3beaa57263",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/565bef268d75bf7df665bce6923a88cd0eb74592",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/5b7c23440343e336259cd45017cc901a744c41b0",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fc59e9482117ebdccd6dc7fa8082f8b980fd021e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}