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      {
        "category": "legal_disclaimer",
        "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.",
        "title": "Terms of Use"
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          "date": "2026-06-08T15:46:31Z",
          "number": "1",
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          "text": "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->async_event_work on\nthe same nvmet-wq.\n\nCall chain:\n\n nvmet_tcp_schedule_release_queue()\n   kref_put(&queue->kref, nvmet_tcp_release_queue)\n     nvmet_tcp_release_queue()\n       queue_work(nvmet_wq, &queue->release_work) <--- nvmet_wq\n         process_one_work()\n           nvmet_tcp_release_queue_work()\n             nvmet_cq_put(&queue->nvme_cq)\n               nvmet_cq_destroy()\n                 nvmet_ctrl_put(cq->ctrl)\n                   nvmet_ctrl_free()\n                     flush_work(&ctrl->async_event_work) <--- nvmet_wq\n\n                      Previously Scheduled by :-\n\t\t        nvmet_add_async_event\n\t\t          queue_work(nvmet_wq, &ctrl->async_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)(&queue->release_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]  <TASK>\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---",
          "title": "Vulnerability description"
        }
      ],
      "product_status": {
        "known_affected": [
          "Debian-10:hyperv-daemons-0:4.19.325-1+tuxcare.els1.amd64",
          "Debian-10:hyperv-daemons-0:4.19.325-1.amd64",
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        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://cve.tuxcare.com/els/cve/CVE-2026-46304"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/551f445a56a11a6457550cddcf39c9ebb8bcacc6",
          "url": "https://git.kernel.org/stable/c/551f445a56a11a6457550cddcf39c9ebb8bcacc6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/781f47d641432c26c19625b2cdd7f40825097592",
          "url": "https://git.kernel.org/stable/c/781f47d641432c26c19625b2cdd7f40825097592"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/8d66ba89480ff098a58d79003a505f383aa4e920",
          "url": "https://git.kernel.org/stable/c/8d66ba89480ff098a58d79003a505f383aa4e920"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/9a4d7222c0955b221e38bb66d10e6bccb672c8a1",
          "url": "https://git.kernel.org/stable/c/9a4d7222c0955b221e38bb66d10e6bccb672c8a1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/a696fbbd5240b4ac9b166f7bd4c550882ff543f1",
          "url": "https://git.kernel.org/stable/c/a696fbbd5240b4ac9b166f7bd4c550882ff543f1"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/aade8abd8b868b6ffa9697aadaea28ec7f65bee6",
          "url": "https://git.kernel.org/stable/c/aade8abd8b868b6ffa9697aadaea28ec7f65bee6"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ae5b0cad163833e10b271e9becc05d81dae56e5f",
          "url": "https://git.kernel.org/stable/c/ae5b0cad163833e10b271e9becc05d81dae56e5f"
        },
        {
          "category": "external",
          "summary": "https://git.kernel.org/stable/c/ee6e20c4bc9eae542a0954a368449532383169d4",
          "url": "https://git.kernel.org/stable/c/ee6e20c4bc9eae542a0954a368449532383169d4"
        }
      ],
      "release_date": "2026-06-08T15:46:31Z",
      "remediations": [
        {
          "category": "no_fix_planned",
          "date": "2026-08-06T12:11:16.882298Z",
          "details": "This issue exists only in the NVMe over Fabrics target path (nvmet/nvmet-tcp) and is reachable only on hosts explicitly configured to export NVMe/TCP; these target modules are not enabled or listening by default. The consequence is a workqueue self-deadlock during controller teardown, affecting availability only with no confidentiality or integrity impact. For enterprise VMs and servers that are not operating as NVMe storage targets, this can be safely deprioritized.",
          "product_ids": [
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  ]
}