driver core: fix potential deadlock in __driver_attach

Description

In the Linux kernel, the following vulnerability has been resolved: driver core: fix potential deadlock in __driver_attach In __driver_attach function, There are also AA deadlock problem, like the commit b232b02bf3c2 ("driver core: fix deadlock in __device_attach"). stack like commit b232b02bf3c2 ("driver core: fix deadlock in __device_attach"). list below: In __driver_attach function, The lock holding logic is as follows: ... __driver_attach if (driver_allows_async_probing(drv)) device_lock(dev) // get lock dev async_schedule_dev(__driver_attach_async_helper, dev); // func async_schedule_node async_schedule_node_domain(func) entry = kzalloc(sizeof(struct async_entry), GFP_ATOMIC); /* when fail or work limit, sync to execute func, but __driver_attach_async_helper will get lock dev as will, which will lead to A-A deadlock. */ if (!entry || atomic_read(&entry_count) > MAX_WORK) { func; else queue_work_node(node, system_unbound_wq, &entry->work) device_unlock(dev) As above show, when it is allowed to do async probes, because of out of memory or work limit, async work is not be allowed, to do sync execute instead. it will lead to A-A deadlock because of __driver_attach_async_helper getting lock dev. Reproduce: and it can be reproduce by make the condition (if (!entry || atomic_read(&entry_count) > MAX_WORK)) untenable, like below: [ 370.785650] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. [ 370.787154] task:swapper/0 state:D stack: 0 pid: 1 ppid: 0 flags:0x00004000 [ 370.788865] Call Trace: [ 370.789374] <TASK> [ 370.789841] __schedule+0x482/0x1050 [ 370.790613] schedule+0x92/0x1a0 [ 370.791290] schedule_preempt_disabled+0x2c/0x50 [ 370.792256] __mutex_lock.isra.0+0x757/0xec0 [ 370.793158] __mutex_lock_slowpath+0x1f/0x30 [ 370.794079] mutex_lock+0x50/0x60 [ 370.794795] __device_driver_lock+0x2f/0x70 [ 370.795677] ? driver_probe_device+0xd0/0xd0 [ 370.796576] __driver_attach_async_helper+0x1d/0xd0 [ 370.797318] ? driver_probe_device+0xd0/0xd0 [ 370.797957] async_schedule_node_domain+0xa5/0xc0 [ 370.798652] async_schedule_node+0x19/0x30 [ 370.799243] __driver_attach+0x246/0x290 [ 370.799828] ? driver_allows_async_probing+0xa0/0xa0 [ 370.800548] bus_for_each_dev+0x9d/0x130 [ 370.801132] driver_attach+0x22/0x30 [ 370.801666] bus_add_driver+0x290/0x340 [ 370.802246] driver_register+0x88/0x140 [ 370.802817] ? virtio_scsi_init+0x116/0x116 [ 370.803425] scsi_register_driver+0x1a/0x30 [ 370.804057] init_sd+0x184/0x226 [ 370.804533] do_one_initcall+0x71/0x3a0 [ 370.805107] kernel_init_freeable+0x39a/0x43a [ 370.805759] ? rest_init+0x150/0x150 [ 370.806283] kernel_init+0x26/0x230 [ 370.806799] ret_from_fork+0x1f/0x30 To fix the deadlock, move the async_schedule_dev outside device_lock, as we can see, in async_schedule_node_domain, the parameter of queue_work_node is system_unbound_wq, so it can accept concurrent operations. which will also not change the code logic, and will not lead to deadlock.

Scores

EPSS (exploitation in 30 days)

0.15% · top 96% of all CVEs (7 Nov 2026)

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.

Weakness

• CWE-667 (opens in a new tab)All about CWE-667 and its CVEs

Affected products

• Linux · Linux

  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < 8191b6cd9ada09b675f17446d5872eb1f77685cb
  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec
  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < 733ab0c19bf17f6ad7c2b580ede006e369d5ab1b
  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < 779b634714c51d05baaeff4868ce2fd9fc7399bf
  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < 37f908038402c9b8325763f306a1c65d88757e15
  • affected ef0ff68351be4fd83bec2d797f0efdc0174a55a4 – < 70fe758352cafdee72a7b13bf9db065f9613ced8

• Linux · Linux

  • affected 5.1
  • unaffected < 5.1
  • unaffected 5.4.211 – ≤ 5.4.*
  • unaffected 5.10.137 – ≤ 5.10.*
  • unaffected 5.15.61 – ≤ 5.15.*
  • unaffected 5.18.18 – ≤ 5.18.*
  • unaffected 5.19.2 – ≤ 5.19.*
  • unaffected 6.0 – ≤ *

References (6)

• https://git.kernel.org/stable/c/8191b6cd9ada09b675f17446d5872eb1f77685cb (opens in a new tab)
• https://git.kernel.org/stable/c/a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec (opens in a new tab)
• https://git.kernel.org/stable/c/733ab0c19bf17f6ad7c2b580ede006e369d5ab1b (opens in a new tab)
• https://git.kernel.org/stable/c/779b634714c51d05baaeff4868ce2fd9fc7399bf (opens in a new tab)
• https://git.kernel.org/stable/c/37f908038402c9b8325763f306a1c65d88757e15 (opens in a new tab)
• https://git.kernel.org/stable/c/70fe758352cafdee72a7b13bf9db065f9613ced8 (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2022-50149](https://trackcve.app/badge/CVE-2022-50149.svg)](https://trackcve.app/cve/CVE-2022-50149)

Record last updated 11 May 2026, 19:13 UTC.