{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "8832cf922151e9dfa2821736beb0ae2dd3968b6e"
            },
            {
              "fixed": "49c7c50ee6325a084216e94395e067ecde8088fa"
            },
            {
              "fixed": "ca111c9d8d6c9d5735878d933a1716c4be86c2d1"
            },
            {
              "fixed": "25ceffc1dabec3b93f458b437aae26f4da293f87"
            },
            {
              "fixed": "2922e3507f6d5caa7f1d07f145e186fc6f317a4e"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "d44ff3b100b94e9f23b1e8dbe688eee9bb867ac9"
            },
            {
              "last_affected": "84026f8c9357c62a9d3e4c554ffd10ccab813654"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.15.42"
            },
            {
              "fixed": "5.16"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.17.10"
            },
            {
              "fixed": "5.18"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.18.0"
            },
            {
              "fixed": "6.12.80"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.21"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "6.19.11"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31557.json"
  },
  "details": "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.",
  "id": "CVE-2026-31557",
  "modified": "2026-07-15T01:49:00.646124392Z",
  "published": "2026-04-24T14:35:40.544Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/25ceffc1dabec3b93f458b437aae26f4da293f87"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2922e3507f6d5caa7f1d07f145e186fc6f317a4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/49c7c50ee6325a084216e94395e067ecde8088fa"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ca111c9d8d6c9d5735878d933a1716c4be86c2d1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/31xxx/CVE-2026-31557.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-31557"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.8.0",
  "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: move async event work off nvmet-wq"
}