CVE-2026-31557 (GCVE-0-2026-31557)
Vulnerability from cvelistv5
Published
2026-04-24 14:35
Modified
2026-10-21 12:39
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet: move async event work off nvmet-wq For target nvmet_ctrl_free() flushes ctrl->async_event_work. If nvmet_ctrl_free() runs on nvmet-wq, the flush re-enters workqueue completion for the same worker:- A. Async event work queued on nvmet-wq (prior to disconnect): nvmet_execute_async_event() queue_work(nvmet_wq, &ctrl->async_event_work) nvmet_add_async_event() queue_work(nvmet_wq, &ctrl->async_event_work) B. Full pre-work chain (RDMA CM path): nvmet_rdma_cm_handler() nvmet_rdma_queue_disconnect() __nvmet_rdma_queue_disconnect() queue_work(nvmet_wq, &queue->release_work) process_one_work() lock((wq_completion)nvmet-wq) <--------- 1st nvmet_rdma_release_queue_work() C. Recursive path (same worker): nvmet_rdma_release_queue_work() nvmet_rdma_free_queue() nvmet_sq_destroy() nvmet_ctrl_put() nvmet_ctrl_free() flush_work(&ctrl->async_event_work) __flush_work() touch_wq_lockdep_map() lock((wq_completion)nvmet-wq) <--------- 2nd Lockdep splat: ============================================ WARNING: possible recursive locking detected 6.19.0-rc3nvme+ #14 Tainted: G N -------------------------------------------- kworker/u192:42/44933 is trying to acquire lock: ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: touch_wq_lockdep_map+0x26/0x90 but task is already holding lock: ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x53e/0x660 3 locks held by kworker/u192:42/44933: #0: ffff888118a00948 ((wq_completion)nvmet-wq){+.+.}-{0:0}, at: process_one_work+0x53e/0x660 #1: ffffc9000e6cbe28 ((work_completion)(&queue->release_work)){+.+.}-{0:0}, at: process_one_work+0x1c5/0x660 #2: ffffffff82d4db60 (rcu_read_lock){....}-{1:3}, at: __flush_work+0x62/0x530 Workqueue: nvmet-wq nvmet_rdma_release_queue_work [nvmet_rdma] Call Trace: __flush_work+0x268/0x530 nvmet_ctrl_free+0x140/0x310 [nvmet] nvmet_cq_put+0x74/0x90 [nvmet] nvmet_rdma_free_queue+0x23/0xe0 [nvmet_rdma] nvmet_rdma_release_queue_work+0x19/0x50 [nvmet_rdma] process_one_work+0x206/0x660 worker_thread+0x184/0x320 kthread+0x10c/0x240 ret_from_fork+0x319/0x390 Move async event work to a dedicated nvmet-aen-wq to avoid reentrant flush on nvmet-wq.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8832cf922151e9dfa2821736beb0ae2dd3968b6e
Version: 8832cf922151e9dfa2821736beb0ae2dd3968b6e
Version: 8832cf922151e9dfa2821736beb0ae2dd3968b6e
Version: 8832cf922151e9dfa2821736beb0ae2dd3968b6e
Version: 8832cf922151e9dfa2821736beb0ae2dd3968b6e
Version: d44ff3b100b94e9f23b1e8dbe688eee9bb867ac9
Version: 84026f8c9357c62a9d3e4c554ffd10ccab813654
Version: 5.15.42   ≤
Version: 5.17.10   ≤
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          "value": "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-\u003easync_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, \u0026ctrl-\u003easync_event_work)\n\n  nvmet_add_async_event()\n     queue_work(nvmet_wq, \u0026ctrl-\u003easync_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, \u0026queue-\u003erelease_work)\n           process_one_work()\n             lock((wq_completion)nvmet-wq)  \u003c--------- 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(\u0026ctrl-\u003easync_event_work)\n               __flush_work()\n                 touch_wq_lockdep_map()\n                 lock((wq_completion)nvmet-wq) \u003c--------- 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)(\u0026queue-\u003erelease_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."
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31557",
    "datePublished": "2026-04-24T14:35:40.544Z",
    "dateReserved": "2026-03-09T15:48:24.116Z",
    "dateUpdated": "2026-10-21T12:39:27.712Z",
    "state": "PUBLISHED"
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No uncontrollable memory layout or victim timing condition is required beyond repeating the network sequence.\\nPR:N - The NVMe discovery controller is reachable with the standard discovery NQN, allows hosts by design, supports async event requests, and skips DH-HMAC-CHAP authentication. In an exposed nvmet-tcp deployment this is reachable without credentials.\\nUI:N - No victim user action is needed after the target service is exposed. The remote peer can trigger the sequence by protocol messages and disconnecting.\\nS:U - The impact is confined to the kernel/NVMe target host that processes the malicious connection. It does not cross a VM, IOMMU, or separate security authority boundary.\\nC:N - The bug is a workqueue/flush recursion issue and does not expose kernel memory or target data. There is no identified read primitive.\\nI:N - The issue does not corrupt memory or provide a write/control-flow primitive. 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It can be triggered repeatedly over the network, so availability impact is scored high.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"8832cf922151e9dfa2821736beb0ae2dd3968b6e\", \"lessThan\": \"a8a3fb2888e2c4fd5410a19ac1623cc78a2383ec\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8832cf922151e9dfa2821736beb0ae2dd3968b6e\", \"lessThan\": \"49c7c50ee6325a084216e94395e067ecde8088fa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8832cf922151e9dfa2821736beb0ae2dd3968b6e\", \"lessThan\": \"ca111c9d8d6c9d5735878d933a1716c4be86c2d1\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8832cf922151e9dfa2821736beb0ae2dd3968b6e\", \"lessThan\": \"25ceffc1dabec3b93f458b437aae26f4da293f87\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"8832cf922151e9dfa2821736beb0ae2dd3968b6e\", \"lessThan\": \"2922e3507f6d5caa7f1d07f145e186fc6f317a4e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"d44ff3b100b94e9f23b1e8dbe688eee9bb867ac9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"84026f8c9357c62a9d3e4c554ffd10ccab813654\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.15.42\", \"lessThan\": \"5.16\", \"versionType\": \"semver\"}, {\"status\": \"affected\", \"version\": \"5.17.10\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}], \"programFiles\": [\"drivers/nvme/target/admin-cmd.c\", \"drivers/nvme/target/core.c\", \"drivers/nvme/target/nvmet.h\", \"drivers/nvme/target/rdma.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.18\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.18\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"6.6.160\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.80\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.21\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.11\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/nvme/target/admin-cmd.c\", \"drivers/nvme/target/core.c\", \"drivers/nvme/target/nvmet.h\", \"drivers/nvme/target/rdma.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/a8a3fb2888e2c4fd5410a19ac1623cc78a2383ec\"}, {\"url\": \"https://git.kernel.org/stable/c/49c7c50ee6325a084216e94395e067ecde8088fa\"}, {\"url\": \"https://git.kernel.org/stable/c/ca111c9d8d6c9d5735878d933a1716c4be86c2d1\"}, {\"url\": \"https://git.kernel.org/stable/c/25ceffc1dabec3b93f458b437aae26f4da293f87\"}, {\"url\": \"https://git.kernel.org/stable/c/2922e3507f6d5caa7f1d07f145e186fc6f317a4e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"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-\u003easync_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, \u0026ctrl-\u003easync_event_work)\\n\\n  nvmet_add_async_event()\\n     queue_work(nvmet_wq, \u0026ctrl-\u003easync_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, \u0026queue-\u003erelease_work)\\n           process_one_work()\\n             lock((wq_completion)nvmet-wq)  \u003c--------- 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(\u0026ctrl-\u003easync_event_work)\\n               __flush_work()\\n                 touch_wq_lockdep_map()\\n                 lock((wq_completion)nvmet-wq) \u003c--------- 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)(\u0026queue-\u003erelease_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.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.160\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.80\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.21\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.11\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.15.42\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionStartIncluding\": \"5.17.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-21T12:39:27.712Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-31557\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-21T12:39:27.712Z\", \"dateReserved\": \"2026-03-09T15:48:24.116Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-04-24T14:35:40.544Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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