{
  "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-2026-74583",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-74583",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-08-21T16:31:55.886Z",
    "updatedAt": "2026-10-16T19:05:58.388Z",
    "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": "net/sched: cls_route: fix fastmap use-after-free on filter",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_route: fix fastmap use-after-free on filter\n\nThe route4 classifier maintains a 16-slot fastmap cache that stores raw\nstruct route4_filter pointers indexed by (id, iif). The reader\n(route4_classify) populates this cache via route4_set_fastmap() for every\nclassified packet that hits a filter. The writer (route4_delete,\nroute4_change) clears the cache via route4_reset_fastmap() before\nRCU-deferred kfree of the filter.\n\nThis creates a UAF race:\n 1. Reader walks the RCU-protected bucket chain, finds filter f\n 2. Writer unlinks f, calls route4_reset_fastmap(), then tcf_queue_work()\n 3. Reader calls route4_set_fastmap() and writes f into the cache\n    *after* the writer's reset, caching a pointer about to be freed\n 4. After the RCU grace period, kfree(f) executes\n 5. Next classified packet on the same (id, iif) tuple hits the stale\n    fastmap entry and reads f->res from freed memory\n\nReproduced with an mdelay(100) accelerator in route4_set_fastmap() and a\nconcurrent add/delete stress test (provided by both zdi and Santosh).\nBoth triggered KASAN slab-use-after-free reports in the route4 fastmap\npaths.\n\nFix:\nIntroduce a per-filter boolean dying flag to suppress stale fastmap\nrepublishing by in-flight readers.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7897198b26445b4009a057bda1986b94a99e5d5f"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "820f083c294ad6d319c02a7d43294f2ed2565139"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "5ec9001be6d0eb527251125632ec8fe88278897f"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b969984b2bdc85d721ce4047cd270cd37ec705a2"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a17f636c9330eac879822ce29f998e5abd1b72c1"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0e7a8cf8895b06d07c7311f028eba16ad742b9bc"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "ae9aff87025219005a2d16b4fe83d6f24643e50d"
            },
            {
              "version": "1109c00547fc66df45b9ff923544be4c1e1bec13",
              "status": "affected",
              "versionType": "git",
              "lessThan": "47d7f7051253bdc02b1d245d87e38f16d31a74df"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "3.18",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "3.18"
            },
            {
              "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": "6.6.152",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.104",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.45",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "7.1.9",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "7.1.*"
            },
            {
              "version": "7.2",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}