{
  "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-2025-21703",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-21703",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-18T14:37:44.261Z",
    "updatedAt": "2026-10-15T01:03:25.306Z",
    "importedAt": "2026-10-24T01:57:29.455Z",
    "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": "netem: Update sch->q.qlen before qdisc_tree_reduce_backlog()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetem: Update sch->q.qlen before qdisc_tree_reduce_backlog()\n\nqdisc_tree_reduce_backlog() notifies parent qdisc only if child\nqdisc becomes empty, therefore we need to reduce the backlog of the\nchild qdisc before calling it. Otherwise it would miss the opportunity\nto call cops->qlen_notify(), in the case of DRR, it resulted in UAF\nsince DRR uses ->qlen_notify() to maintain its active list.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "83c6ab12f08dcc09d4c5ac86fdb89736b28f1d31",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e395fec75ac2dbffc99b4bce57b7f1f3c5449f2c"
            },
            {
              "version": "216509dda290f6db92c816dd54b83c1df9da9e76",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7f31d74fcc556a9166b1bb20515542de7bb939d1"
            },
            {
              "version": "c2047b0e216c8edce227d7c42f99ac2877dad0e4",
              "status": "affected",
              "versionType": "git",
              "lessThan": "98a2c685293aae122f688cde11d9334dddc5d207"
            },
            {
              "version": "10df49cfca73dfbbdb6c4150d859f7e8926ae427",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7b79ca9a1de6a428d486ff52fb3d602321c08f55"
            },
            {
              "version": "3824c5fad18eeb7abe0c4fc966f29959552dca3e",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1f8e3f4a4b8b90ad274dfbc66fc7d55cb582f4d5"
            },
            {
              "version": "356078a5c55ec8d2061fcc009fb8599f5b0527f9",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6312555249082d6d8cc5321ff725df05482d8b83"
            },
            {
              "version": "f8d4bc455047cf3903cd6f85f49978987dbb3027",
              "status": "affected",
              "versionType": "git",
              "lessThan": "839ecc583fa00fab785fde1c85a326743657fd32"
            },
            {
              "version": "f8d4bc455047cf3903cd6f85f49978987dbb3027",
              "status": "affected",
              "versionType": "git",
              "lessThan": "638ba5089324796c2ee49af10427459c2de35f71"
            },
            {
              "version": "5.4.288",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.4.291"
            },
            {
              "version": "5.10.232",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.235"
            },
            {
              "version": "5.15.175",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15.179"
            },
            {
              "version": "6.1.121",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.1.129"
            },
            {
              "version": "6.6.67",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.6.78"
            },
            {
              "version": "6.12.6",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "6.12.14"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "6.13",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "6.13"
            },
            {
              "version": "5.4.291",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.235",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.179",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.129",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.78",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.14",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.13.3",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.13.*"
            },
            {
              "version": "6.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}