{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "06406d81a2d7cfb8abcc4fa6cdfeb8e5897007c5"
            },
            {
              "fixed": "ae5b0cad163833e10b271e9becc05d81dae56e5f"
            },
            {
              "fixed": "8d66ba89480ff098a58d79003a505f383aa4e920"
            },
            {
              "fixed": "a696fbbd5240b4ac9b166f7bd4c550882ff543f1"
            },
            {
              "fixed": "9a4d7222c0955b221e38bb66d10e6bccb672c8a1"
            },
            {
              "fixed": "ee6e20c4bc9eae542a0954a368449532383169d4"
            },
            {
              "fixed": "781f47d641432c26c19625b2cdd7f40825097592"
            },
            {
              "fixed": "551f445a56a11a6457550cddcf39c9ebb8bcacc6"
            },
            {
              "fixed": "aade8abd8b868b6ffa9697aadaea28ec7f65bee6"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "3976dd677e891c0b2c63d08028d445663539472c"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "4.9.68"
            },
            {
              "fixed": "4.10"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "4.10.0"
            },
            {
              "fixed": "5.10.258"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.209"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.175"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.140"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.88"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.30"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.0.7"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46304.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free\n\nnvmet_tcp_release_queue_work() runs on nvmet-wq and can drop the\nfinal controller reference through nvmet_cq_put(). If that triggers\nnvmet_ctrl_free(), the teardown path flushes ctrl-\u003easync_event_work on\nthe same nvmet-wq.\n\nCall chain:\n\n nvmet_tcp_schedule_release_queue()\n   kref_put(\u0026queue-\u003ekref, nvmet_tcp_release_queue)\n     nvmet_tcp_release_queue()\n       queue_work(nvmet_wq, \u0026queue-\u003erelease_work) \u003c--- nvmet_wq\n         process_one_work()\n           nvmet_tcp_release_queue_work()\n             nvmet_cq_put(\u0026queue-\u003envme_cq)\n               nvmet_cq_destroy()\n                 nvmet_ctrl_put(cq-\u003ectrl)\n                   nvmet_ctrl_free()\n                     flush_work(\u0026ctrl-\u003easync_event_work) \u003c--- nvmet_wq\n\n                      Previously Scheduled by :-\n\t\t        nvmet_add_async_event\n\t\t          queue_work(nvmet_wq, \u0026ctrl-\u003easync_event_work);\n\nThis trips lockdep with a possible recursive locking warning.\n\n[ 5223.015876] run blktests nvme/003 at 2026-04-07 20:53:55\n[ 5223.061801] loop0: detected capacity change from 0 to 2097152\n[ 5223.072206] nvmet: adding nsid 1 to subsystem blktests-subsystem-1\n[ 5223.088368] nvmet_tcp: enabling port 0 (127.0.0.1:4420)\n[ 5223.126086] nvmet: Created discovery controller 1 for subsystem nqn.2014-08.org.nvmexpress.discovery for NQN nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349.\n[ 5223.128453] nvme nvme1: new ctrl: NQN \"nqn.2014-08.org.nvmexpress.discovery\", addr 127.0.0.1:4420, hostnqn: nqn.2014-08.org.nvmexpress:uuid:0f01fb42-9f7f-4856-b0b3-51e60b8de349\n[ 5233.199447] nvme nvme1: Removing ctrl: NQN \"nqn.2014-08.org.nvmexpress.discovery\"\n\n[ 5233.227718] ============================================\n[ 5233.231283] WARNING: possible recursive locking detected\n[ 5233.234696] 7.0.0-rc3nvme+ #20 Tainted: G           O     N\n[ 5233.238434] --------------------------------------------\n[ 5233.241852] kworker/u192:6/2413 is trying to acquire lock:\n[ 5233.245429] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26/0x90\n[ 5233.251438]\n               but task is already holding lock:\n[ 5233.255254] ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc/0x6e0\n[ 5233.261125]\n               other info that might help us debug this:\n[ 5233.265333]  Possible unsafe locking scenario:\n\n[ 5233.269217]        CPU0\n[ 5233.270795]        ----\n[ 5233.272436]   lock((wq_completion)nvmet-wq);\n[ 5233.275241]   lock((wq_completion)nvmet-wq);\n[ 5233.278020]\n                *** DEADLOCK ***\n\n[ 5233.281793]  May be due to missing lock nesting notation\n\n[ 5233.286195] 3 locks held by kworker/u192:6/2413:\n[ 5233.289192]  #0: ffff888111632548 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x5cc/0x6e0\n[ 5233.294569]  #1: ffffc9000e2a7e40 ((work_completion)(\u0026queue-\u003erelease_work)){+.+.}-{0:0}, at: process_one_work+0x1c5/0x6e0\n[ 5233.300128]  #2: ffffffff82d7dc40 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x62/0x530\n[ 5233.304290]\n               stack backtrace:\n[ 5233.306520] CPU: 4 UID: 0 PID: 2413 Comm: kworker/u192:6 Tainted: G           O     N  7.0.0-rc3nvme+ #20 PREEMPT(full)\n[ 5233.306524] Tainted: [O]=OOT_MODULE, [N]=TEST\n[ 5233.306525] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.17.0-0-gb52ca86e094d-prebuilt.qemu.org 04/01/2014\n[ 5233.306527] Workqueue: nvmet-wq nvmet_tcp_release_queue_work [nvmet_tcp]\n[ 5233.306532] Call Trace:\n[ 5233.306534]  \u003cTASK\u003e\n[ 5233.306536]  dump_stack_lvl+0x73/0xb0\n[ 5233.306552]  print_deadlock_bug+0x225/0x2f0\n[ 5233.306556]  __lock_acquire+0x13f0/0x2290\n[ 5233.306563]  lock_acquire+0xd0/0x300\n[ 5233.306565]  ? touch_wq_lockdep_map+0x26/0x90\n[ 5233.306571]  ? __flush_work+0x20b/0x530\n[ 5233.306573]  ? touch_wq_lockdep_map+0x26/0x90\n[ 5233.306577]  touch_wq_lockdep_map+0x3b/0x90\n[ 5233.306580]  ? touch_wq_lockdep_map+0x26/0x90\n[ 52\n---truncated---",
  "id": "CVE-2026-46304",
  "modified": "2026-07-10T03:54:25.870030158Z",
  "published": "2026-06-08T15:46:31.747Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/551f445a56a11a6457550cddcf39c9ebb8bcacc6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/781f47d641432c26c19625b2cdd7f40825097592"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/8d66ba89480ff098a58d79003a505f383aa4e920"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9a4d7222c0955b221e38bb66d10e6bccb672c8a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a696fbbd5240b4ac9b166f7bd4c550882ff543f1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/aade8abd8b868b6ffa9697aadaea28ec7f65bee6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ae5b0cad163833e10b271e9becc05d81dae56e5f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ee6e20c4bc9eae542a0954a368449532383169d4"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46304.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-46304"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.7.5",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nvmet: avoid recursive nvmet-wq flush in nvmet_ctrl_free"
}