{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4f76617378ee97c557b526cb58d3c61eb0a9c963"
            },
            {
              "fixed": "dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0"
            },
            {
              "fixed": "56d7488533ceac4e986e96e15c9e487a2245bc01"
            },
            {
              "fixed": "f72a51810d49411bd8cad0c2df8592320a2fe5cc"
            },
            {
              "fixed": "2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd"
            },
            {
              "fixed": "b6aecea4b2b246f9fbd98a5712daa1193a60818e"
            },
            {
              "fixed": "2a5ac0c0f1f7da33929211a2e41911bf72ee35d8"
            },
            {
              "fixed": "34f4feff3e90bd09308fad0974e97113b23b812a"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.2.0"
            },
            {
              "fixed": "5.15.218"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.153"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.105"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.46"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80548.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ns390/vfio_ccw: Selectively expand io_mutex\n\nThe io_mutex was defined to serialize the io_regions, but then has\nalso sort of been associated with the I/O themselves because of\nthe close relationship they share.\n\nWith the handful of races that are possible, the choices are either to:\n A) expand the scope of io_mutex to close these remaining windows, or\n B) reduce the scope of io_mutex to just io_region, and introduce a new\n    lock mechanism for the remaining I/O resources\n\nThis patch implements A, since B brings with it a lot more interactions\nthat would need to be tracked and kept in a correct hierarchy. It also\ntakes advantage of the workqueue element for cp_free() that now gets\ncalled out of fsm_notoper(), which could be invoked out of an interrupt\ncontext and thus cannot acquire a mutex itself.",
  "id": "CVE-2026-80548",
  "modified": "2026-08-28T03:31:01.793142205Z",
  "published": "2026-08-26T14:37:18.759Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a5ac0c0f1f7da33929211a2e41911bf72ee35d8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/34f4feff3e90bd09308fad0974e97113b23b812a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/56d7488533ceac4e986e96e15c9e487a2245bc01"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b6aecea4b2b246f9fbd98a5712daa1193a60818e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f72a51810d49411bd8cad0c2df8592320a2fe5cc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80548.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80548"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "s390/vfio_ccw: Selectively expand io_mutex"
}