{
  "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-2021-47294",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47294",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T14:35:18.034Z",
    "updatedAt": "2026-05-23T15:19:39.451Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "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": "netrom: Decrease sock refcount when sock timers expire",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetrom: Decrease sock refcount when sock timers expire\n\nCommit 63346650c1a9 (\"netrom: switch to sock timer API\") switched to use\nsock timer API. It replaces mod_timer() by sk_reset_timer(), and\ndel_timer() by sk_stop_timer().\n\nFunction sk_reset_timer() will increase the refcount of sock if it is\ncalled on an inactive timer, hence, in case the timer expires, we need to\ndecrease the refcount ourselves in the handler, otherwise, the sock\nrefcount will be unbalanced and the sock will never be freed.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "ce29e8a259de767f7210d346ad2b031cb8ab2732",
              "status": "affected",
              "versionType": "git",
              "lessThan": "853262355518cd1247515b74e83fabf038aa6c29"
            },
            {
              "version": "baa9e32336bf6d0d74a7c3486d2a27feaf57cd5f",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a01634bf91f2b6c42583770eb6815fb6d1e251cf"
            },
            {
              "version": "0adf571fa34b27bd0b97b408cc0f0dc54b72f0eb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "48866fd5c361ea417ed24b43fc2a7dc2f5b060ef"
            },
            {
              "version": "2c6b572458a9127e8070df13fa7f115c29ab1d92",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9619cc7d97c3aa8ed3cfd2b8678b74fb6d6c7950"
            },
            {
              "version": "63346650c1a94a92be61a57416ac88c0a47c4327",
              "status": "affected",
              "versionType": "git",
              "lessThan": "25df44e90ff5959b5c24ad361b648504a7e39ef3"
            },
            {
              "version": "63346650c1a94a92be61a57416ac88c0a47c4327",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6811744bd0efb9e472cb15d066cdb460beb8cb8a"
            },
            {
              "version": "63346650c1a94a92be61a57416ac88c0a47c4327",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bc1660206c3723c37ed4d622ad81781f1e987250"
            },
            {
              "version": "63346650c1a94a92be61a57416ac88c0a47c4327",
              "status": "affected",
              "versionType": "git",
              "lessThan": "517a16b1a88bdb6b530f48d5d153478b2552d9a8"
            },
            {
              "version": "f1d9a1f2ef6ff17293d21d5e6b80e04bea0cf508",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "519e8a22a454b1f1baa3a151b184fe51bc18e178",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.4.173",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.4.277"
            },
            {
              "version": "4.9.155",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.9.277"
            },
            {
              "version": "4.14.98",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.14.241"
            },
            {
              "version": "4.19.20",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.19.199"
            },
            {
              "version": "3.18.134",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.19"
            },
            {
              "version": "4.20.7",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.21"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "4.4.277",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.4.*"
            },
            {
              "version": "4.9.277",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "version": "4.14.241",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.199",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.136",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.54",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.13.6",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.13.*"
            },
            {
              "version": "5.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}