{
  "schemaVersion": 1,
  "attribution": [
    {
      "source": "CISA Known Exploited Vulnerabilities",
      "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog",
      "licence": "US government work"
    },
    {
      "source": "GitHub Advisory Database",
      "url": "https://github.com/advisories",
      "licence": "CC BY 4.0"
    },
    {
      "source": "Have I Been Pwned",
      "url": "https://haveibeenpwned.com/",
      "licence": "CC BY 4.0"
    },
    {
      "source": "CVE Program (CVE records)",
      "url": "https://www.cve.org/Legal/TermsOfUse",
      "licence": "CVE Terms of Use",
      "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.",
      "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy."
    },
    {
      "source": "FIRST EPSS",
      "url": "https://www.first.org/epss/",
      "licence": "free to use; FIRST requests attribution"
    }
  ],
  "record": {
    "id": "CVE-2026-80548",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-80548",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-26T14:37:18.759Z",
    "updatedAt": "2026-10-16T19:26:25.857Z",
    "importedAt": "2026-10-24T01:58:30.346Z",
    "snapshot": {
      "id": "cve_2026-10-24_midnight_baseline",
      "at": "2026-10-24T00:00:00.000Z",
      "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z"
    },
    "facts": {
      "title": "s390/vfio_ccw: Selectively expand io_mutex",
      "summary": "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.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "dab6a6627b0b0cce23653e99c7b0bf8c6cfd82e0"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "56d7488533ceac4e986e96e15c9e487a2245bc01"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "f72a51810d49411bd8cad0c2df8592320a2fe5cc"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2ba9efdf9ebedc4e54df4b56aa3b43a65f7967cd"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b6aecea4b2b246f9fbd98a5712daa1193a60818e"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2a5ac0c0f1f7da33929211a2e41911bf72ee35d8"
            },
            {
              "version": "4f76617378ee97c557b526cb58d3c61eb0a9c963",
              "status": "affected",
              "versionType": "git",
              "lessThan": "34f4feff3e90bd09308fad0974e97113b23b812a"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.2",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.2"
            },
            {
              "version": "5.15.218",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.185",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.153",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.105",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.46",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}