{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cbc53e08a793b073e79f42ca33f1f3568703540d"
            },
            {
              "fixed": "f7a6cd508e9e825a2c69fa9e13d41ee156852f25"
            },
            {
              "fixed": "cc91202fc20a44aab4c206f12a2bfe05da936051"
            },
            {
              "fixed": "d970341cfa5594614c7a6634886c7688b4f5cafd"
            },
            {
              "fixed": "ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.7.0"
            },
            {
              "fixed": "6.12.81"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.22"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.12"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43036.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: use skb_header_pointer() for TCPv4 GSO frag_off check\n\nSyzbot reported a KMSAN uninit-value warning in gso_features_check()\ncalled from netif_skb_features() [1].\n\ngso_features_check() reads iph-\u003efrag_off to decide whether to clear\nmangleid_features. Accessing the IPv4 header via ip_hdr()/inner_ip_hdr()\ncan rely on skb header offsets that are not always safe for direct\ndereference on packets injected from PF_PACKET paths.\n\nUse skb_header_pointer() for the TCPv4 frag_off check so the header read\nis robust whether data is already linear or needs copying.\n\n[1] https://syzkaller.appspot.com/bug?extid=1543a7d954d9c6d00407",
  "id": "CVE-2026-43036",
  "modified": "2026-07-15T01:48:51.368718812Z",
  "published": "2026-05-01T14:15:34.640Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/cc91202fc20a44aab4c206f12a2bfe05da936051"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d970341cfa5594614c7a6634886c7688b4f5cafd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ddc748a391dd8642ba6b2e4fe22e7f2ddf84b7f0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f7a6cd508e9e825a2c69fa9e13d41ee156852f25"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/43xxx/CVE-2026-43036.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43036"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "summary": "net: use skb_header_pointer() for TCPv4 GSO frag_off check"
}