CVE-2026-46135 (GCVE-0-2026-46135)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:35 – Updated: 2026-07-04 11:50
VLAI
Title
nvmet-tcp: fix race between ICReq handling and queue teardown
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fix race between ICReq handling and queue teardown nvmet_tcp_handle_icreq() updates queue->state after sending an Initialization Connection Response (ICResp), but it does so without serializing against target-side queue teardown. If an NVMe/TCP host sends an Initialization Connection Request (ICReq) and immediately closes the connection, target-side teardown may start in softirq context before io_work drains the already buffered ICReq. In that case, nvmet_tcp_schedule_release_queue() sets queue->state to NVMET_TCP_Q_DISCONNECTING and drops the queue reference under state_lock. If io_work later processes that ICReq, nvmet_tcp_handle_icreq() can still overwrite the state back to NVMET_TCP_Q_LIVE. That defeats the DISCONNECTING-state guard in nvmet_tcp_schedule_release_queue() and allows a later socket state change to re-enter teardown and issue a second kref_put() on an already released queue. The ICResp send failure path has the same problem. If teardown has already moved the queue to DISCONNECTING, a send error can still overwrite the state with NVMET_TCP_Q_FAILED, again reopening the window for a second teardown path to drop the queue reference. Fix this by serializing both post-send state transitions with state_lock and bailing out if teardown has already started. Use -ESHUTDOWN as an internal sentinel for that bail-out path rather than propagating it as a transport error like -ECONNRESET. Keep nvmet_tcp_socket_error() setting rcv_state to NVMET_TCP_RECV_ERR before honoring that sentinel so receive-side parsing stays quiesced until the existing release path completes.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 5f0b95ef68ab9afba75b20eebf436130f80c161a (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 49891c8fe0cb43fbbe480da1cdccfbbaeb820cb3 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 67e1aaf93b495c2f10bc8a5fbba575fbb7f449b6 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < dcfe4d1f7960e7d1c01642318f3aae1a604f8508 (git)
Affected: 872d26a391da92ed8f0c0f5cb5fef428067b7f30 , < 5293a8882c549fab4a878bc76b0b6c951f980a61 (git)
Create a notification for this product.
Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.88 , ≤ 6.12.* (semver)
Unaffected: 6.18.30 , ≤ 6.18.* (semver)
Unaffected: 7.0.7 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: fix race between ICReq handling and queue teardown\n\nnvmet_tcp_handle_icreq() updates queue-\u003estate after sending an\nInitialization Connection Response (ICResp), but it does so without\nserializing against target-side queue teardown.\n\nIf an NVMe/TCP host sends an Initialization Connection Request\n(ICReq) and immediately closes the connection, target-side teardown\nmay start in softirq context before io_work drains the already\nbuffered ICReq. In that case, nvmet_tcp_schedule_release_queue()\nsets queue-\u003estate to NVMET_TCP_Q_DISCONNECTING and drops the queue\nreference under state_lock.\n\nIf io_work later processes that ICReq, nvmet_tcp_handle_icreq() can\nstill overwrite the state back to NVMET_TCP_Q_LIVE. That defeats the\nDISCONNECTING-state guard in nvmet_tcp_schedule_release_queue() and\nallows a later socket state change to re-enter teardown and issue a\nsecond kref_put() on an already released queue.\n\nThe ICResp send failure path has the same problem. If teardown has\nalready moved the queue to DISCONNECTING, a send error can still\noverwrite the state with NVMET_TCP_Q_FAILED, again reopening the\nwindow for a second teardown path to drop the queue reference.\n\nFix this by serializing both post-send state transitions with\nstate_lock and bailing out if teardown has already started.\n\nUse -ESHUTDOWN as an internal sentinel for that bail-out path rather\nthan propagating it as a transport error like -ECONNRESET. Keep\nnvmet_tcp_socket_error() setting rcv_state to NVMET_TCP_RECV_ERR before\nhonoring that sentinel so receive-side parsing stays quiesced until the\nexisting release path completes."
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-07T11:41:24+00:00",
      "cve": "CVE-2026-46135",
      "id": "CVE-2026-46135",
      "initial_release_date": "2026-05-28T00:00:00+00:00",
      "product_status:fixed": "963",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet-tcp: fix race between ICReq handling and queue teardown",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46135.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.