CVE-2026-23066 (GCVE-0-2026-23066)
Vulnerability from cvelistv5
Published
2026-02-04 16:07
Modified
2026-04-03 13:31
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: rxrpc: Fix recvmsg() unconditional requeue If rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at the front of the recvmsg queue already has its mutex locked, it requeues the call - whether or not the call is already queued. The call may be on the queue because MSG_PEEK was also passed and so the call was not dequeued or because the I/O thread requeued it. The unconditional requeue may then corrupt the recvmsg queue, leading to things like UAFs or refcount underruns. Fix this by only requeuing the call if it isn't already on the queue - and moving it to the front if it is already queued. If we don't queue it, we have to put the ref we obtained by dequeuing it. Also, MSG_PEEK doesn't dequeue the call so shouldn't call rxrpc_notify_socket() for the call if we didn't use up all the data on the queue, so fix that also.
References
Impacted products
Vendor Product Version
Linux Linux Version: 540b1c48c37ac0ad66212004db21e1ff7e2d78be
Version: 540b1c48c37ac0ad66212004db21e1ff7e2d78be
Version: 540b1c48c37ac0ad66212004db21e1ff7e2d78be
Version: 540b1c48c37ac0ad66212004db21e1ff7e2d78be
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{
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          "programFiles": [
            "include/trace/events/rxrpc.h",
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrxrpc: Fix recvmsg() unconditional requeue\n\nIf rxrpc_recvmsg() fails because MSG_DONTWAIT was specified but the call at\nthe front of the recvmsg queue already has its mutex locked, it requeues\nthe call - whether or not the call is already queued.  The call may be on\nthe queue because MSG_PEEK was also passed and so the call was not dequeued\nor because the I/O thread requeued it.\n\nThe unconditional requeue may then corrupt the recvmsg queue, leading to\nthings like UAFs or refcount underruns.\n\nFix this by only requeuing the call if it isn\u0027t already on the queue - and\nmoving it to the front if it is already queued.  If we don\u0027t queue it, we\nhave to put the ref we obtained by dequeuing it.\n\nAlso, MSG_PEEK doesn\u0027t dequeue the call so shouldn\u0027t call\nrxrpc_notify_socket() for the call if we didn\u0027t use up all the data on the\nqueue, so fix that also."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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      "providerMetadata": {
        "dateUpdated": "2026-04-03T13:31:50.977Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/930114425065f7ace6e0c0630fab4af75e059ea8"
        },
        {
          "url": "https://git.kernel.org/stable/c/2c28769a51deb6022d7fbd499987e237a01dd63a"
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      ],
      "title": "rxrpc: Fix recvmsg() unconditional requeue",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-23066",
    "datePublished": "2026-02-04T16:07:47.764Z",
    "dateReserved": "2026-01-13T15:37:45.954Z",
    "dateUpdated": "2026-04-03T13:31:50.977Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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