{
  "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-2026-97931",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-97931",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-09-25T10:22:47.382Z",
    "updatedAt": "2026-10-19T09:10:58.123Z",
    "importedAt": "2026-10-24T01:58:41.756Z",
    "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": "ALSA: us122l: Prevent write upgrades for read mappings",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: us122l: Prevent write upgrades for read mappings\n\nThe hwdep mmap callback rejects read-buffer mappings that are initially\nwritable, but leaves VM_MAYWRITE set on mappings created with PROT_READ.\nA process that can open the hwdep node O_RDWR can later use mprotect() to\nmake the mapping writable.\n\nThe read allocation begins with struct usb_stream. Its read_size member is\nused by the fault handler to decide which pages belong to the read buffer.\nThe read VMA intentionally remains expandable because pcm_usb_stream uses\nmremap() after reading that size. Changing read_size first can therefore\nmap and access pages beyond the allocation. The same member is also\nconsumed by usb_stream_free(), where changing it can make\nfree_pages_exact() release pages outside the allocation.\n\nClear VM_MAYWRITE for read-buffer mappings after rejecting an initially\nwritable VMA. This keeps the separate output-buffer mapping writable while\npreventing later permission upgrades.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cbc1f954ce67d739d41d1f0757d29850353ebb6a"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "becb89036a1320ef0a77da2d27935ac0704345c4"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6a5f5a5a32c78e67701f1d0f26bc87af68895604"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "938e8d6cee8d36f24669dfdcd3717e081eb32d64"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "64a87950239867682cde128020e1a47088295e5c"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "d9c537b14f4982f17b103e3a2cfeee4bee6bc026"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0eb9dd4774af0ac4d1fd105ef2b0a1f6cec06f2f"
            },
            {
              "version": "030a07e441296c372f946cd4065b5d831d8dc40c",
              "status": "affected",
              "versionType": "git",
              "lessThan": "71c610aeb1770302ac9c9e0b9a4ecd37f1311928"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.28",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.28"
            },
            {
              "version": "5.10.271",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.222",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.189",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.158",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.111",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.2.7",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.2.*"
            },
            {
              "version": "7.3",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}