{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-63828",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-63828"
  ],
  "published": "2026-07-19T12:02:32Z",
  "summary": "apparmor: mediate the implicit connect of TCP fast open sendmsg",
  "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.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N"
    }
  ],
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    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4d587cd8a72155089a627130bbd4716ec0856e21"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-17T05:24:08Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.4,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Exploitation requires a confined local process to invoke sendmsg(2)/sendto(2) with MSG_FASTOPEN; the vulnerable AppArmor LSM hook runs on the syscall path before TCP fast-open performs its implicit connect.\nAC:L - Any confined task that already has send permission can reliably trigger the bypass with a single sendmsg/sendto call using MSG_FASTOPEN and a destination address, with no race or special victim state required beyond TCP Fast Open client support.\nPR:L - The attacker must be an unprivileged process confined by an AppArmor profile that grants network send but denies connect (e.g., hardened Snap/sandboxed service profiles on Ubuntu); no real root or capabilities beyond normal confined-user execution are needed.\nUI:N - No victim interaction is required; the confined attacker process directly issues the bypassing syscall without needing another user or administrator to perform any action.\nS:C - Successful exploitation crosses the AppArmor confinement boundary, allowing a sandboxed task to establish outbound TCP/MPTCP connections that connect(2) mediation would have blocked, escaping the intended network policy scope.\nC:H - Bypassing connect mediation lets a confined process open TCP/MPTCP sessions to destinations policy forbids and read arbitrary response data from those services (internal APIs, metadata endpoints, C2 servers), constituting unauthorized information disclosure.\nI:H - The bypass enables unauthorized outbound connection establishment and transmission of arbitrary application data (including SYN-cookie data) to hosts explicitly denied by the AppArmor connect rule, violating integrity of the confinement policy.\nA:N - This is a pure LSM policy-bypass flaw with no kernel memory corruption, panic, oops, hang, or resource exhaustion; exploitation does not impact system availability."
    }
  }
}