{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "69e3c75f4d541a6eb151b3ef91f34033cb3ad6e1"
            },
            {
              "fixed": "9c7e8ff48c377bef18c3d178748aea0575b69ede"
            },
            {
              "fixed": "2a73b2c37ee3060a880b53cd24783d93fc7be5f8"
            },
            {
              "fixed": "e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2"
            },
            {
              "fixed": "d85d2fd54e901637c81d847811e03c662aee13cd"
            },
            {
              "fixed": "016763e829cac37b3234eace86fd0a4c560de4a7"
            },
            {
              "fixed": "27e068d1b35dbec10a3cf268887c94407be4badc"
            },
            {
              "fixed": "d48ea5c9c4c34dc0df621f0e39ed3a16b644621a"
            },
            {
              "fixed": "21b5953e7494c16a42e6cd8cf110e18d13ae4a6b"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.31"
            },
            {
              "fixed": "5.10.267"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.218"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.185"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.152"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.104"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.45"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.9"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74668.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\npacket: use consistent hard_header_len in TX_RING send path\n\ntpacket_snd() reads dev-\u003ehard_header_len independently for skb\nallocation and header construction in tpacket_fill_skb(). Concurrent\nnetdevice reconfiguration can therefore make the reserved headroom\nsmaller than the amount later pushed, or make copylen - hard_header_len\nnegative.\n\nSnapshot hard_header_len once before processing ring frames and use it\nfor the frame limit, headroom allocation, copy length, and skb\nconstruction. Pass the snapshot to tpacket_fill_skb().\n\nThe separate SOCK_DGRAM consistency problem between hard_header_len and\nheader_ops-\u003ecreate is not addressed here.",
  "id": "CVE-2026-74668",
  "modified": "2026-08-28T03:30:29.654626516Z",
  "published": "2026-08-22T15:32:39.583Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/016763e829cac37b3234eace86fd0a4c560de4a7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/21b5953e7494c16a42e6cd8cf110e18d13ae4a6b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/27e068d1b35dbec10a3cf268887c94407be4badc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2a73b2c37ee3060a880b53cd24783d93fc7be5f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9c7e8ff48c377bef18c3d178748aea0575b69ede"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d48ea5c9c4c34dc0df621f0e39ed3a16b644621a"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d85d2fd54e901637c81d847811e03c662aee13cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e79f59a8527a49078cfaf8fe8fb5fcefc20c76d2"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74668.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74668"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "packet: use consistent hard_header_len in TX_RING send path"
}