{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "cf60af03ca4e71134206809ea892e49b92a88896"
            },
            {
              "fixed": "7f57428ce00891d26b0f087ef754a4d820ec83aa"
            },
            {
              "fixed": "faea60deaa05c76f0772650f42eafde12bd39d93"
            },
            {
              "fixed": "07b71c342382b854ab8030b244aeab6a7228ad7d"
            },
            {
              "fixed": "4a69b83045d3195d5b9a9b053ad840ddb2998b4e"
            },
            {
              "fixed": "45ebb934ea50b436ce49b2f159f090dab0d7fa28"
            },
            {
              "fixed": "4d587cd8a72155089a627130bbd4716ec0856e21"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.6.0"
            },
            {
              "fixed": "6.1.177"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.144"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.95"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.38"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63828.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: mediate the implicit connect of TCP fast open sendmsg\n\nsendmsg()/sendto() with MSG_FASTOPEN is a combination of connect(2) and\nwrite(2): it opens the connection in the SYN. apparmor_socket_sendmsg()\nonly checks AA_MAY_SEND, so a profile that grants send but denies connect\nlets a confined task open an outbound TCP/MPTCP connection that connect(2)\nwould have refused, bypassing connect mediation.\n\nMediate the implicit connect when MSG_FASTOPEN is set and a destination\nis supplied. Add it to apparmor_socket_sendmsg() (not the shared\naa_sock_msg_perm() helper, which recvmsg also uses) and call aa_sk_perm()\ndirectly, mirroring the selinux and tomoyo fixes. sk_is_tcp() does not\ncover MPTCP fast open, so the SOCK_STREAM/IPPROTO_MPTCP arm is explicit.",
  "id": "CVE-2026-63828",
  "modified": "2026-07-21T03:42:11.973814682Z",
  "published": "2026-07-19T12:02:22.644Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/07b71c342382b854ab8030b244aeab6a7228ad7d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45ebb934ea50b436ce49b2f159f090dab0d7fa28"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a69b83045d3195d5b9a9b053ad840ddb2998b4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4d587cd8a72155089a627130bbd4716ec0856e21"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7f57428ce00891d26b0f087ef754a4d820ec83aa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/faea60deaa05c76f0772650f42eafde12bd39d93"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63828.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-63828"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "apparmor: mediate the implicit connect of TCP fast open sendmsg"
}