{
  "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-2026-31422",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2026-31422",
    "idYear": 2026,
    "status": "PUBLISHED",
    "publishedAt": "2026-04-13T13:40:25.911Z",
    "updatedAt": "2026-10-15T01:16:02.769Z",
    "importedAt": "2026-10-24T01:58:02.025Z",
    "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_flow: fix NULL pointer dereference on shared blocks",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/sched: cls_flow: fix NULL pointer dereference on shared blocks\n\nflow_change() calls tcf_block_q() and dereferences q->handle to derive\na default baseclass.  Shared blocks leave block->q NULL, causing a NULL\nderef when a flow filter without a fully qualified baseclass is created\non a shared block.\n\nCheck tcf_block_shared() before accessing block->q and return -EINVAL\nfor shared blocks.  This avoids the null-deref shown below:\n\n=======================================================================\nKASAN: null-ptr-deref in range [0x0000000000000038-0x000000000000003f]\nRIP: 0010:flow_change (net/sched/cls_flow.c:508)\nCall Trace:\n tc_new_tfilter (net/sched/cls_api.c:2432)\n rtnetlink_rcv_msg (net/core/rtnetlink.c:6980)\n [...]\n=======================================================================",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "57f94ac7e953eece5ed4819605a18f3cdfc63dcc"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "942813276edeb1741fa5b0a73471beb4e495fa08"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "cc707a4fd4c3b6ab2722e06bc359aa010e13d408"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "4a09f72007201c9f667dc47f64517ec23eea65e5"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "9bf5fc36a43f7b8b5507c96e74fb81f1e8b4957e"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a208c3e1232997e9317887294c20008dfcb75449"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "415ea0c973c754b9f375225807810eb9045f4293"
            },
            {
              "version": "1abf272022cf1d18469405f47b4ec49c6a3125db",
              "status": "affected",
              "versionType": "git",
              "lessThan": "1a280dd4bd1d616a01d6ffe0de284c907b555504"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.15"
            },
            {
              "version": "5.10.253",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.203",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "6.1.168",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "version": "6.6.134",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "version": "6.12.81",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "version": "6.18.22",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "version": "6.19.12",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "version": "7.0",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}