{"cve":"CVE-2022-50166","nvd":{"published":"2025-06-18T11:15:46.907","modified":"2026-06-17T05:22:53.700","status":"Analyzed","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: When HCI work queue is drained, only queue chained work\n\nThe HCI command, event, and data packet processing workqueue is drained\nto avoid deadlock in commit\n76727c02c1e1 (\"Bluetooth: Call drain_workqueue() before resetting state\").\n\nThere is another delayed work, which will queue command to this drained\nworkqueue. Which results in the following error report:\n\nBluetooth: hci2: command 0x040f tx timeout\nWARNING: CPU: 1 PID: 18374 at kernel/workqueue.c:1438 __queue_work+0xdad/0x1140\nWorkqueue: events hci_cmd_timeout\nRIP: 0010:__queue_work+0xdad/0x1140\nRSP: 0000:ffffc90002cffc60 EFLAGS: 00010093\nRAX: 0000000000000000 RBX: ffff8880b9d3ec00 RCX: 0000000000000000\nRDX: ffff888024ba0000 RSI: ffffffff814e048d RDI: ffff8880b9d3ec08\nRBP: 0000000000000008 R08: 0000000000000000 R09: 00000000b9d39700\nR10: ffffffff814f73c6 R11: 0000000000000000 R12: ffff88807cce4c60\nR13: 0000000000000000 R14: ffff8880796d8800 R15: ffff8880796d8800\nFS:  0000000000000000(0000) GS:ffff8880b9d00000(0000) knlGS:0000000000000000\nCS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 000000c0174b4000 CR3: 000000007cae9000 CR4: 00000000003506e0\nDR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000\nDR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400\nCall Trace:\n <TASK>\n ? queue_work_on+0xcb/0x110\n ? lockdep_hardirqs_off+0x90/0xd0\n queue_work_on+0xee/0x110\n process_one_work+0x996/0x1610\n ? pwq_dec_nr_in_flight+0x2a0/0x2a0\n ? rwlock_bug.part.0+0x90/0x90\n ? _raw_spin_lock_irq+0x41/0x50\n worker_thread+0x665/0x1080\n ? process_one_work+0x1610/0x1610\n kthread+0x2e9/0x3a0\n ? kthread_complete_and_exit+0x40/0x40\n ret_from_fork+0x1f/0x30\n </TASK>\n\nTo fix this, we can add a new HCI_DRAIN_WQ flag, and don't queue the\ntimeout workqueue while command workqueue is draining.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-667"],"references":["https://git.kernel.org/stable/c/3b382555706558f5c0587862b6dc03e96a252bba","https://git.kernel.org/stable/c/4bf367fa1fefabdf14938d0ac9ed60020389112e","https://git.kernel.org/stable/c/877afadad2dce8aae1f2aad8ce47e072d4f6165e"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:03:23.287444849+00:00"},"epss":{"cve":"CVE-2022-50166","score":0.00184,"percentile":0.08006,"date":"2026-10-31"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}