{
  "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-2025-37890",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-37890",
    "idYear": 2025,
    "status": "PUBLISHED",
    "publishedAt": "2025-05-16T13:01:12.798Z",
    "updatedAt": "2026-08-05T11:58:05.817Z",
    "importedAt": "2026-10-24T01:57:34.152Z",
    "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": "net_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet_sched: hfsc: Fix a UAF vulnerability in class with netem as child qdisc\n\nAs described in Gerrard's report [1], we have a UAF case when an hfsc class\nhas a netem child qdisc. The crux of the issue is that hfsc is assuming\nthat checking for cl->qdisc->q.qlen == 0 guarantees that it hasn't inserted\nthe class in the vttree or eltree (which is not true for the netem\nduplicate case).\n\nThis patch checks the n_active class variable to make sure that the code\nwon't insert the class in the vttree or eltree twice, catering for the\nreentrant case.\n\n[1] https://lore.kernel.org/netdev/CAHcdcOm+03OD2j6R0=YHKqmy=VgJ8xEOKuP6c7mSgnp-TEJJbw@mail.gmail.com/",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "273bbcfa53541cde38b2003ad88a59b770306421"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e0cf8ee23e1915431f262a7b2dee0c7a7d699af0"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e3e949a39a91d1f829a4890e7dfe9417ac72e4d0"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8df7d37d626430035b413b97cee18396b3450bef"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "6082a87af4c52f58150d40dec1716011d871ac21"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2e7093c7a8aba5d4f8809f271488e5babe75e202"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ac39fd4a757584d78ed062d4f6fd913f83bd98b5"
            },
            {
              "version": "37d9cf1a3ce35de3df6f7d209bfb1f50cf188cea",
              "status": "affected",
              "versionType": "git",
              "lessThan": "141d34391abbb315d68556b7c67ad97885407547"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.0",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.0"
            },
            {
              "version": "5.4.294",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.238",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.182",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.138",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.90",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.28",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.14.6",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.14.*"
            },
            {
              "version": "6.15",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}