{
  "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-2026-74735",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74735",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-26T14:36:49.352Z",
    "updatedAt": "2026-10-21T12:46:21.709Z",
    "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": "l2tp: fix tunnel and session refcount leak on seq_file release",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nl2tp: fix tunnel and session refcount leak on seq_file release\n\nIn pppol2tp_proc_open() and l2tp_dfs_seq_open(), iteration state\n(pd->tunnel and pd->session) is kept in seq_file private data to allow\niteration across multiple read() system calls.\n\nHowever, if userspace closes /proc/net/pppol2tp or /sys/kernel/debug/l2tp/tunnels\nbefore reading to end-of-file (EOF), any tunnel or session reference stored in\npd->tunnel / pd->session is left un-dropped when seq_file private data is freed.\n\nFix this by dropping any remaining pd->tunnel and pd->session references in\npppol2tp_proc_release() and l2tp_dfs_seq_release() when closing the file.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bd897e414451fb34dfdf08b31899180e5ab7149b"
            },
            {
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "status": "affected",
              "versionType": "git",
              "lessThan": "bdf83613781956cc39798ed08321f74ab0467f4d"
            },
            {
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8c4fde01bcf91f22b9c7ded8c3e14addd7ddd500"
            },
            {
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ebe2774e956482dd3c70b8991f6f7654356339e6"
            },
            {
              "version": "0e0c3fee3a59a387aeecc4fca6f3a2e9615a5443",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9006c116dd111d457bf5d074990210f70a4ad2c8"
            },
            {
              "version": "f6104e9ae04462523c372928b1173766a771ef95",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "7f8e401f9e612df2a95c1ef76217c00181389bb5",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "c712ed63e9b33d9a282fbd92ce25c64918c3129f",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "9a8863e8a8def9d88583cd9c60db38a008e6b8cf",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "3.16.60",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "3.17"
            },
            {
              "version": "4.16.6",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.17"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.17",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.17"
            },
            {
              "version": "6.6.160",
              "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": "7.1.10",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}