{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "decde2586b34b99684faff1eab41e5c496c27fb6"
            },
            {
              "fixed": "bbb7db8c74b0b5d17a695136f0f0806ecd0118f6"
            },
            {
              "fixed": "fadaff3f66e124c3a62237f9c881819a8ac90309"
            },
            {
              "fixed": "a859b280441fb02f64ed4037f03d5c0c34a7a595"
            },
            {
              "fixed": "e1a9d3cc11829c5414a75eb39c704f461936eb24"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.101"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.42"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68119.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ntcp: initialize standalone TCP-AO response padding\n\ntcp_v4_send_ack() and tcp_v6_send_response() construct standalone TCP\nresponses with TCP-AO options.  The option length carries the actual MAC\nlength, but the TCP header length includes the option rounded up to a\nfour-byte boundary.\n\ntcp_ao_hash_hdr() writes the MAC only.  Thus, when the MAC length is not\nfour-byte aligned, the one to three bytes after the MAC are left\nuninitialized and may be transmitted.  For the normal TCP-AO hashing\nmode, those bytes also have to be initialized before computing the MAC.\n\nInitialize only the alignment padding in the TCP-AO branches, before\nhashing the header.  Use TCPOPT_NOP, as in the normal TCP-AO output path.\nThis avoids adding work to non-AO TCP responses while preserving a valid\nauthenticated header.",
  "id": "CVE-2026-68119",
  "modified": "2026-08-14T03:51:35.596869361Z",
  "published": "2026-08-10T11:58:39.026Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a859b280441fb02f64ed4037f03d5c0c34a7a595"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bbb7db8c74b0b5d17a695136f0f0806ecd0118f6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e1a9d3cc11829c5414a75eb39c704f461936eb24"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fadaff3f66e124c3a62237f9c881819a8ac90309"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68119.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68119"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "tcp: initialize standalone TCP-AO response padding"
}