{
  "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-2026-74478",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74478",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-15T12:27:12.549Z",
    "updatedAt": "2026-08-19T16:37:30.555Z",
    "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": "um: vector: fix use-after-free in vector_mmsg_rx()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\num: vector: fix use-after-free in vector_mmsg_rx()\n\nWhen vector_mmsg_rx() discards a packet whose overlay header fails\nverify_header(), it frees the skb and continues the loop:\n\n\tif (header_check < 0) {\n\t\tdev_kfree_skb_irq(skb);\n\t\tvp->estats.rx_encaps_errors++;\n\t\tcontinue;\n\t}\n\nThe normal and short-packet paths fall through to the bottom of the\nloop body, which clears the consumed slot and advances the cursors:\n\n\t(*skbuff_vector) = NULL;\n\tmmsg_vector++;\n\tskbuff_vector++;\n\nThe verify_header() < 0 path skips that via continue, so the freed skb\nis left in skbuff_vector[] and the cursors do not advance. The next\niteration reads the same slot, gets the freed skb, and frees it again,\nproducing a refcount underflow / use-after-free in the RX path.\n\nDiscard the slot the same way the other paths do before continuing.\n\nOnly transports whose verify_header() can return negative are affected:\nGRE and L2TPv3 do so on a cookie/session-id mismatch (raw/tap do not),\nso any peer on such a transport can trigger it without authentication.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "967c779c9853d2a1cc9cd8e61d300250c348f3d9"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a7bc015bb798c525e7a82dd14225c6aeb994274b"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7dc9781e320d664c9bdd50003c9acfddf363d1e1"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4b9601595e8b6b5d18878cac0aeabc687d241111"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "67d58ab4f2ccf7145f3da07e025735a09c79de1b"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "180ff4c81faf01ec4e06082c9daa7c40518ead89"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "804b681002ead233abf49a3efd681f5468a835f9"
            },
            {
              "version": "49da7e64f33e80edffb1a9eeb230fa4c3f42dffb",
              "status": "affected",
              "versionType": "git",
              "lessThan": "af421e9aed3920c7ac88c24daa48606c7112feca"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.17",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.17"
            },
            {
              "version": "5.10.265",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.216",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.183",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.151",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.103",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.44",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.8",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}