{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "e114e473771c848c3cfec05f0123e70f1cdbdc99"
            },
            {
              "fixed": "4e49f997ef0c569e09b42aab6bd38c7c54ea095d"
            },
            {
              "fixed": "dbece6c2f80b0470d8d99d7a016827dce99ed6e3"
            },
            {
              "fixed": "7be4bd21c50afa83c93799b0f16cf5bfa493194e"
            },
            {
              "fixed": "ec47f4177046dfaaf1cebb15f4d2e7b543475daf"
            },
            {
              "fixed": "e35dc5a4ed6d1e536382d80c685187511ff248a1"
            },
            {
              "fixed": "c2ab27c2e11591524b1378c24ad18882a425d1fa"
            },
            {
              "fixed": "d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe"
            },
            {
              "fixed": "fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "2.6.25"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93191.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmack: fix incorrect task context in smack_msg_queue_msgrcv\n\nThe smack_msg_queue_msgrcv() function incorrectly checks\nthe permissions of the 'current' task instead of the\n'target' task.\n\nIn the msgsnd() syscall path, if a receiver is already waiting,\nthe pipelined_send() optimization is used to push the message\ndirectly to the receiver task:\n\n    ipc/msg.c`pipelined_send():\n    ` smp_store_release(\u0026msr-\u003er_msg, msg)\n\nIn this case, the 'sender' (current) task performs the check\non behalf of the 'receiver' task (msr-\u003er_tsk, passed as the\n'target' parameter):\n\n  ipc/msg.c`pipelined_send():\n  ` security_msg_queue_msgrcv(,, target := msr-\u003er_tsk,,)\n\nHowever, smack_msg_queue_msgrcv() ignores the 'target' and\nchecks 'current':\n\n  smack_msg_queue_msgrcv(…)\n  ` smk_curacc_msq(isp, MAY_READWRITE); // current task\n\n'current' MAY satisfy smack_msg_queue_msgrcv r/w requirement,\nbut 'target' (the receiver task) might NOT;\nas a result, an unauthorized receiver gets the message,\nviolating MAC policy.\n\nTest:\n1) create a sysv message queue with label “foo”\n2) echo \"bar foo r\" \u003e/smack/load2\n3) msgrcv(,,,0,MSG_NOERROR) in \"bar\"-labeled task.\n    The task is waiting for the messages ...\n4) msgsnd() from a \"foo\"-labeled task:\n\"bar\"-labeled task gets the message.\n\nThis patch fixes the issue by checking permission on the\n'target' task instead of 'current'.\n\n(2008-02-04, Casey Schaufler)",
  "id": "CVE-2026-93191",
  "modified": "2026-09-19T03:30:38.102083155Z",
  "published": "2026-09-17T16:12:15.765Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4e49f997ef0c569e09b42aab6bd38c7c54ea095d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7be4bd21c50afa83c93799b0f16cf5bfa493194e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c2ab27c2e11591524b1378c24ad18882a425d1fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d02c55e3ea82e41ea2c2026e08201e5daa4d0cfe"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dbece6c2f80b0470d8d99d7a016827dce99ed6e3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e35dc5a4ed6d1e536382d80c685187511ff248a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ec47f4177046dfaaf1cebb15f4d2e7b543475daf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fba3d32825f4bbc8e20f0cdc3b14df57965b8fe5"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93191.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93191"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "smack: fix incorrect task context in smack_msg_queue_msgrcv"
}