nvmet: move async event work off nvmet-wq_CVE-2026-31557

{
    "lastseen": "",
    "description": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet: move async event work off nvmet-wq\n\nFor target nvmet_ctrl_free() flushes ctrl->async_event_work.\nIf nvmet_ctrl_free() runs on nvmet-wq, the flush re-enters workqueue\ncompletion for the same worker:-\n\nA. Async event work queued on nvmet-wq (prior to disconnect):\n  nvmet_execute_async_event()\n     queue_work(nvmet_wq, &ctrl->async_event_work)\n\n  nvmet_add_async_event()\n     queue_work(nvmet_wq, &ctrl->async_event_work)\n\nB. Full pre-work chain (RDMA CM path):\n  nvmet_rdma_cm_handler()\n     nvmet_rdma_queue_disconnect()\n       __nvmet_rdma_queue_disconnect()\n         queue_work(nvmet_wq, &queue->release_work)\n           process_one_work()\n             lock((wq_completion)nvmet-wq)  <--------- 1st\n             nvmet_rdma_release_queue_work()\n\nC. Recursive path (same worker):\n  nvmet_rdma_release_queue_work()\n     nvmet_rdma_free_queue()\n       nvmet_sq_destroy()\n         nvmet_ctrl_put()\n           nvmet_ctrl_free()\n             flush_work(&ctrl->async_event_work)\n               __flush_work()\n                 touch_wq_lockdep_map()\n                 lock((wq_completion)nvmet-wq) <--------- 2nd\n\nLockdep splat:\n\n  ============================================\n  WARNING: possible recursive locking detected\n  6.19.0-rc3nvme+ #14 Tainted: G                 N\n  --------------------------------------------\n  kworker/u192:42/44933 is trying to acquire lock:\n  ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26/0x90\n\n  but task is already holding lock:\n  ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x53e/0x660\n\n  3 locks held by kworker/u192:42/44933:\n   #0: ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x53e/0x660\n   #1: ffffc9000e6cbe28 ((work_completion)(&queue->release_work)){+.+.}-{0:0}, at: process_one_work+0x1c5/0x660\n   #2: ffffffff82d4db60 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x62/0x530\n\n  Workqueue: nvmet-wq nvmet_rdma_release_queue_work [nvmet_rdma]\n  Call Trace:\n   __flush_work+0x268/0x530\n   nvmet_ctrl_free+0x140/0x310 [nvmet]\n   nvmet_cq_put+0x74/0x90 [nvmet]\n   nvmet_rdma_free_queue+0x23/0xe0 [nvmet_rdma]\n   nvmet_rdma_release_queue_work+0x19/0x50 [nvmet_rdma]\n   process_one_work+0x206/0x660\n   worker_thread+0x184/0x320\n   kthread+0x10c/0x240\n   ret_from_fork+0x319/0x390\n\nMove async event work to a dedicated nvmet-aen-wq to avoid reentrant\nflush on nvmet-wq.",
    "published": "2026-04-24T14:35:40.544Z",
    "modified": "2026-04-27T14:04:03.623Z",
    "type": "cve",
    "title": "nvmet: move async event work off nvmet-wq",
    "source": "Linux",
    "references": "https://git.kernel.org/stable/c/49c7c50ee6325a084216e94395e067ecde8088fa\nhttps://git.kernel.org/stable/c/ca111c9d8d6c9d5735878d933a1716c4be86c2d1\nhttps://git.kernel.org/stable/c/25ceffc1dabec3b93f458b437aae26f4da293f87\nhttps://git.kernel.org/stable/c/2922e3507f6d5caa7f1d07f145e186fc6f317a4e",
    "id": "CVE-2026-31557",
    "bulletinFamily": "",
    "cwe": null,
    "cvelist": null,
    "sourceData": "Linux Linux 8832cf922151e9dfa2821736beb0ae2dd3968b6e\nLinux Linux 8832cf922151e9dfa2821736beb0ae2dd3968b6e\nLinux Linux 8832cf922151e9dfa2821736beb0ae2dd3968b6e\nLinux Linux 8832cf922151e9dfa2821736beb0ae2dd3968b6e\nLinux Linux d44ff3b100b94e9f23b1e8dbe688eee9bb867ac9\nLinux Linux 84026f8c9357c62a9d3e4c554ffd10ccab813654\nLinux Linux 5.18",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
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        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
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        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
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            "privilegesRequired": "",
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        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Linux",
    "version": "8832cf922151e9dfa2821736beb0ae2dd3968b6e",
    "vendor": "Linux",
    "ai_description": "",
    "ai_severity": "",
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    "ai_product": "",
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    "ai_score": 0
}