{
  "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-2021-47309",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2021-47309",
    "idYear": 2021,
    "status": "PUBLISHED",
    "publishedAt": "2024-05-21T14:35:27.981Z",
    "updatedAt": "2026-08-05T08:47:13.551Z",
    "importedAt": "2026-10-24T01:56:36.661Z",
    "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: validate lwtstate->data before returning from skb_tunnel_info()",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: validate lwtstate->data before returning from skb_tunnel_info()\n\nskb_tunnel_info() returns pointer of lwtstate->data as ip_tunnel_info\ntype without validation. lwtstate->data can have various types such as\nmpls_iptunnel_encap, etc and these are not compatible.\nSo skb_tunnel_info() should validate before returning that pointer.\n\nSplat looks like:\nBUG: KASAN: slab-out-of-bounds in vxlan_get_route+0x418/0x4b0 [vxlan]\nRead of size 2 at addr ffff888106ec2698 by task ping/811\n\nCPU: 1 PID: 811 Comm: ping Not tainted 5.13.0+ #1195\nCall Trace:\n dump_stack_lvl+0x56/0x7b\n print_address_description.constprop.8.cold.13+0x13/0x2ee\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n kasan_report.cold.14+0x83/0xdf\n ? vxlan_get_route+0x418/0x4b0 [vxlan]\n vxlan_get_route+0x418/0x4b0 [vxlan]\n [ ... ]\n vxlan_xmit_one+0x148b/0x32b0 [vxlan]\n [ ... ]\n vxlan_xmit+0x25c5/0x4780 [vxlan]\n [ ... ]\n dev_hard_start_xmit+0x1ae/0x6e0\n __dev_queue_xmit+0x1f39/0x31a0\n [ ... ]\n neigh_xmit+0x2f9/0x940\n mpls_xmit+0x911/0x1600 [mpls_iptunnel]\n lwtunnel_xmit+0x18f/0x450\n ip_finish_output2+0x867/0x2040\n [ ... ]",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e7f3c9df40515a6c6b46f36c4c94cf48a043f887"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "b61d327cd3cc5ea591f3bf751dd11e034f388bb5"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "83bdcfbd968bcc91a0632b7b625e4a9b0cba5e0d"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8bb1589c89e61e3b182dd546f1021928ebb5c2a6"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8aa13a86964cdec4fd969ef677c6614ff068641a"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "2179d96ec702cc33ead02a9ce40ece599b8538c5"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "a915379594f1e045421635c6316d8f3ffa018c58"
            },
            {
              "version": "61adedf3e3f1d3f032c5a6a299978d91eff6d555",
              "status": "affected",
              "versionType": "git",
              "lessThan": "67a9c94317402b826fc3db32afc8f39336803d97"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "4.3",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "4.3"
            },
            {
              "version": "4.4.277",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.4.*"
            },
            {
              "version": "4.9.277",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.9.*"
            },
            {
              "version": "4.14.241",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.14.*"
            },
            {
              "version": "4.19.199",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.135",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.53",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.13.5",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.13.*"
            },
            {
              "version": "5.14",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}