{
  "cveId": "CVE-2026-93191",
  "url": "https://patchblox.com/security/cve/CVE-2026-93191",
  "summary": "CVE-2026-93191 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-93191, released September 23, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "smack: fix incorrect task context in smack_msg_queue_msgrcv",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  smack: fix incorrect task context in smack_msg_queue_msgrcv  The smack_msg_queue_msgrcv() function incorrectly checks the permissions of the \u0027current\u0027 task instead of the \u0027target\u0027 task.  In the msgsnd() syscall path, if a receiver is already waiting, the pipelined_send() optimization is used to push the message directly to the receiver task:      ipc/msg.c\u0060pipelined_send():     \u0060 smp_store_release(\u0026msr-\u003Er_msg, msg)  In this case, the \u0027sender\u0027 (current) task performs the check on behalf of the \u0027receiver\u0027 task (msr-\u003Er_tsk, passed as the \u0027target\u0027 parameter):    ipc/msg.c\u0060pipelined_send():   \u0060 security_msg_queue_msgrcv(,, target := msr-\u003Er_tsk,,)  However, smack_msg_queue_msgrcv() ignores the \u0027target\u0027 and checks \u0027current\u0027:    smack_msg_queue_msgrcv(\u2026)   \u0060 smk_curacc_msq(isp, MAY_READWRITE); // current task  \u0027current\u0027 MAY satisfy smack_msg_queue_msgrcv r/w requirement, but \u0027target\u0027 (the receiver task) might NOT; as a result, an unauthorized receiver gets the message, violating MAC policy.  Test: 1) create a sysv message queue with label \u201Cfoo\u201D 2) echo \u0022bar foo r\u0022 \u003E/smack/load2 3) msgrcv(,,,0,MSG_NOERROR) in \u0022bar\u0022-labeled task.     The task is waiting for the messages ... 4) msgsnd() from a \u0022foo\u0022-labeled task: \u0022bar\u0022-labeled task gets the message.  This patch fixes the issue by checking permission on the \u0027target\u0027 task instead of \u0027current\u0027.  (2008-02-04, Casey Schaufler)",
  "published": "2026-09-17T17:18:15Z",
  "severity": "Low",
  "cvss": 3.3,
  "epss": 0.00196,
  "epssPercentile": 0.0938,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-93191",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-93191",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93191",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-93191",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93191",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-93191",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93191",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-93191",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-93191",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}