CVE-2026-89970 (GCVE-0-2026-89970)
Vulnerability from cvelistv5
Published
2026-09-16 10:32
Modified
2026-10-19 08:55
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: Synchronize timeout work during SQ teardown nvmet_auth_sq_free() cancels auth_expired_work with cancel_delayed_work(). If the work has already started, cancellation does not wait for the callback. Transport teardown can consequently free or reuse the queue containing struct nvmet_sq while nvmet_auth_expired_work() still accesses that SQ. Add a teardown-specific helper that synchronously drains the delayed work before freeing authentication state, and use it from nvmet_sq_destroy(). Keep the non-synchronous helper for in-band authentication state cleanup, where the SQ owner remains alive.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
Version: 1a70200f404ae210b4f0334e3936e84f8edb6bc8
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{
  "containers": {
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          "programFiles": [
            "drivers/nvme/target/auth.c",
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          "programFiles": [
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            "drivers/nvme/target/core.c",
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              "version": "7.2.5",
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              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
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        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "versionEndExcluding": "6.1.188",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-auth: Synchronize timeout work during SQ teardown\n\nnvmet_auth_sq_free() cancels auth_expired_work with\ncancel_delayed_work(). If the work has already started, cancellation does\nnot wait for the callback. Transport teardown can consequently free or\nreuse the queue containing struct nvmet_sq while\nnvmet_auth_expired_work() still accesses that SQ.\n\nAdd a teardown-specific helper that synchronously drains the delayed work\nbefore freeing authentication state, and use it from nvmet_sq_destroy().\nKeep the non-synchronous helper for in-band authentication state cleanup,\nwhere the SQ owner remains alive."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The UAF is in nvmet-auth timeout work reached via AUTH_SEND on NVMe-oF targets; nvmet-tcp (and nvmet-rdma) accept remote connections, so a network initiator can arm the timer and tear down the queue over TCP/RDMA.\nAC:L - The attacker controls both sides of the race: AUTH_SEND schedules auth_expired_work with an attacker-chosen KATO delay, and closing the connection runs nvmet_sq_destroy(); cancel_delayed_work() does not wait, so the race is repeatable.\nPR:N - AUTH_SEND is dispatched as a Fabrics command before nvmet_check_auth_status() and before DH-HMAC-CHAP credentials are verified; discovery accepts any host NQN, so no Linux privileges or verified secrets are required.\nUI:N - No victim user action is required; the attacker connects to an already-deployed NVMe-oF target, sends AUTH_SEND to arm the timeout, and disconnects when the work is due.\nS:U - The use-after-free corrupts the in-kernel nvmet_sq/queue object on the target host and does not cross a VM, hypervisor, or IOMMU security boundary.\nC:H - Transport teardown can free or reuse the queue containing struct nvmet_sq while nvmet_auth_expired_work() still accesses it; that UAF can be leveraged for kernel information disclosure via heap reuse.\nI:H - The delayed work writes dhchap_step and dhchap_tid into a potentially freed or reused queue object, giving a kernel UAF write primitive exploitable for memory corruption and control-flow hijacking.\nA:H - Racing the timeout callback against SQ teardown is a kernel UAF of the queue and can oops or panic; the work may also dereference sq-\u003ectrl after teardown has already cleared it."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:55:43.826Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/664022fa1c93f4eba09ef5ee02411b9709dd7a93"
        },
        {
          "url": "https://git.kernel.org/stable/c/c3c126a6142a1335bc8c34a5607c39cf01daf295"
        },
        {
          "url": "https://git.kernel.org/stable/c/c17c87bde6d6f5252a6a6f0a94b2430164aa28d5"
        },
        {
          "url": "https://git.kernel.org/stable/c/7555ddd60af72df2862dd8f9b730a9848577edda"
        },
        {
          "url": "https://git.kernel.org/stable/c/eb4f9127a2b8a152743f1ee597627e2f69cb54fe"
        },
        {
          "url": "https://git.kernel.org/stable/c/eaa948c0e19b1bb2d93262207bca0c3d19cc3406"
        }
      ],
      "title": "nvmet-auth: Synchronize timeout work during SQ teardown",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89970",
    "datePublished": "2026-09-16T10:32:50.306Z",
    "dateReserved": "2026-09-11T19:38:34.778Z",
    "dateUpdated": "2026-10-19T08:55:43.826Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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