{
  "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-2022-49340",
    "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2022-49340",
    "idYear": 2022,
    "status": "PUBLISHED",
    "publishedAt": "2025-02-26T02:10:57.322Z",
    "updatedAt": "2026-08-05T08:54:49.092Z",
    "importedAt": "2026-10-24T01:56:49.724Z",
    "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": "ip_gre: test csum_start instead of transport header",
      "summary": "In the Linux kernel, the following vulnerability has been resolved:\n\nip_gre: test csum_start instead of transport header\n\nGRE with TUNNEL_CSUM will apply local checksum offload on\nCHECKSUM_PARTIAL packets.\n\nipgre_xmit must validate csum_start after an optional skb_pull,\nelse lco_csum may trigger an overflow. The original check was\n\n\tif (csum && skb_checksum_start(skb) < skb->data)\n\t\treturn -EINVAL;\n\nThis had false positives when skb_checksum_start is undefined:\nwhen ip_summed is not CHECKSUM_PARTIAL. A discussed refinement\nwas straightforward\n\n\tif (csum && skb->ip_summed == CHECKSUM_PARTIAL &&\n\t    skb_checksum_start(skb) < skb->data)\n\t\treturn -EINVAL;\n\nBut was eventually revised more thoroughly:\n- restrict the check to the only branch where needed, in an\n  uncommon GRE path that uses header_ops and calls skb_pull.\n- test skb_transport_header, which is set along with csum_start\n  in skb_partial_csum_set in the normal header_ops datapath.\n\nTurns out skbs can arrive in this branch without the transport\nheader set, e.g., through BPF redirection.\n\nRevise the check back to check csum_start directly, and only if\nCHECKSUM_PARTIAL. Do leave the check in the updated location.\nCheck field regardless of whether TUNNEL_CSUM is configured.",
      "affected": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "774430026bd9a472d08c5d3c33351a782315771a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "7596bd7920985f7fc8579a92e48bc53ce4475b21"
            },
            {
              "version": "3d32ce5472bb2ca720bef84089b85f76a705fd1a",
              "status": "affected",
              "versionType": "git",
              "lessThan": "3d08bc3a5d9b2106f5c8bcf1adb73147824aa006"
            },
            {
              "version": "87b34cd6485192777f632f92d592f2a71d8801a6",
              "status": "affected",
              "versionType": "git",
              "lessThan": "fbeb8dfa8b87ef259eef0c89e39b53962a3cf604"
            },
            {
              "version": "8a0ed250f911da31a2aef52101bc707846a800ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "e6b6f98fc7605c06c0a3baa70f62c534d7b4ce58"
            },
            {
              "version": "8a0ed250f911da31a2aef52101bc707846a800ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0c92d813c7c9ca2212ecd879232e7d87362fce98"
            },
            {
              "version": "8a0ed250f911da31a2aef52101bc707846a800ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "0ffa268724656633af5f37a38c212326d98ebe8c"
            },
            {
              "version": "8a0ed250f911da31a2aef52101bc707846a800ff",
              "status": "affected",
              "versionType": "git",
              "lessThan": "8d21e9963bec1aad2280cdd034c8993033ef2948"
            },
            {
              "version": "4bf5d5224ffca069df4501ba5fcc6ded9c002ead",
              "status": "affected",
              "versionType": "git"
            },
            {
              "version": "4.19.207",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "4.19.247"
            },
            {
              "version": "5.4.148",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.4.198"
            },
            {
              "version": "5.10.68",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.10.122"
            },
            {
              "version": "5.14.7",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "5.15"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "status": "unaffected",
              "versionType": "semver",
              "lessThan": "5.15"
            },
            {
              "version": "4.19.247",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "version": "5.4.198",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "version": "5.10.122",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "version": "5.15.47",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "version": "5.17.15",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.17.*"
            },
            {
              "version": "5.18.4",
              "status": "unaffected",
              "versionType": "semver",
              "lessThanOrEqual": "5.18.*"
            },
            {
              "version": "5.19",
              "status": "unaffected",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ]
        }
      ]
    }
  }
}