{
  "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-2021-47520",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47520",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-24T15:09:33.796Z",
    "updatedAt": "2026-08-05T08:48:14.519Z",
    "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": "can: pch_can: pch_can_rx_normal: fix use after free",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: pch_can: pch_can_rx_normal: fix use after free\n\nAfter calling netif_receive_skb(skb), dereferencing skb is unsafe.\nEspecially, the can_frame cf which aliases skb memory is dereferenced\njust after the call netif_receive_skb(skb).\n\nReordering the lines solves the issue.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bafe343a885c70dddf358379cf0b2a1c07355d8d"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3a3c46e2eff0577454860a203be1a8295f4acb76"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "affbad02bf80380a7403885b9fe4a1587d1bb4f3"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3e193ef4e0a3f5bf92ede83ef214cb09d01b00aa"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "abb4eff3dcd2e583060082a18a8dbf31f02689d4"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "703dde112021c93d6e89443c070e7dbd4dea612e"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6c73fc931658d8cbc8a1714b326cb31eb71d16a7"
            },
            {
              "version": "b21d18b51b31a24d17f883b678432fbdee3d5675",
              "status": "affected",
              "versionType": "git",
              "lessThan": "94cddf1e9227a171b27292509d59691819c458db"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "2.6.37",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "2.6.37"
            },
            {
              "version": "4.4.295",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.4.*"
            },
            {
              "version": "4.9.293",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "version": "4.14.258",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.221",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.165",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.85",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.16",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}