CVE-2022-49986
scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
In the Linux kernel, the following vulnerability has been resolved: scsi: storvsc: Remove WQ_MEM_RECLAIM from storvsc_error_wq storvsc_error_wq workqueue should not be marked as WQ_MEM_RECLAIM as it doesn't need to make forward progress under memory pressure. Marking this workqueue as WQ_MEM_RECLAIM may cause deadlock while flushing a non-WQ_MEM_RECLAIM workqueue. In the current state it causes the following warning: [ 14.506347] ------------[ cut here ]------------ [ 14.506354] workqueue: WQ_MEM_RECLAIM storvsc_error_wq_0:storvsc_remove_lun is flushing !WQ_MEM_RECLAIM events_freezable_power_:disk_events_workfn [ 14.506360] WARNING: CPU: 0 PID: 8 at <-snip->kernel/workqueue.c:2623 check_flush_dependency+0xb5/0x130 [ 14.506390] CPU: 0 PID: 8 Comm: kworker/u4:0 Not tainted 5.4.0-1086-azure #91~18.04.1-Ubuntu [ 14.506391] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.1 05/09/2022 [ 14.506393] Workqueue: storvsc_error_wq_0 storvsc_remove_lun [ 14.506395] RIP: 0010:check_flush_dependency+0xb5/0x130 <-snip-> [ 14.506408] Call Trace: [ 14.506412] __flush_work+0xf1/0x1c0 [ 14.506414] __cancel_work_timer+0x12f/0x1b0 [ 14.506417] ? kernfs_put+0xf0/0x190 [ 14.506418] cancel_delayed_work_sync+0x13/0x20 [ 14.506420] disk_block_events+0x78/0x80 [ 14.506421] del_gendisk+0x3d/0x2f0 [ 14.506423] sr_remove+0x28/0x70 [ 14.506427] device_release_driver_internal+0xef/0x1c0 [ 14.506428] device_release_driver+0x12/0x20 [ 14.506429] bus_remove_device+0xe1/0x150 [ 14.506431] device_del+0x167/0x380 [ 14.506432] __scsi_remove_device+0x11d/0x150 [ 14.506433] scsi_remove_device+0x26/0x40 [ 14.506434] storvsc_remove_lun+0x40/0x60 [ 14.506436] process_one_work+0x209/0x400 [ 14.506437] worker_thread+0x34/0x400 [ 14.506439] kthread+0x121/0x140 [ 14.506440] ? process_one_work+0x400/0x400 [ 14.506441] ? kthread_park+0x90/0x90 [ 14.506443] ret_from_fork+0x35/0x40 [ 14.506445] ---[ end trace 2d9633159fdc6ee7 ]---
Timeline
ID reserved
By Linux
Published
- 11 months later
· 11 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.19% · top 91% 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
Affected products
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < b692c238ddfa61f00d97c4c1f021425d132ba96f
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < b4c928ace9a123629eeb14ec5d7ee8f73e5ac668
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < 46fcb0fc884db78a0384be92cc2a51927e6581b8
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < cd2a50d0a097a42b6de283377da98ff757505120
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < 828f57ac75eaccd6607ee4d1468d34e983e32c68
- affected 436ad941335386c5fc7faa915a8fbdfe8c908084 – < d957e7ffb2c72410bcc1a514153a46719255a5da
- affected 4.15
- unaffected < 4.15
- unaffected 4.19.257 – ≤ 4.19.*
- unaffected 5.4.212 – ≤ 5.4.*
- unaffected 5.10.140 – ≤ 5.10.*
- unaffected 5.15.64 – ≤ 5.15.*
- unaffected 5.19.6 – ≤ 5.19.*
- unaffected 6.0 – ≤ *
References (6)
- https://git.kernel.org/stable/c/b692c238ddfa61f00d97c4c1f021425d132ba96f (opens in a new tab)
- https://git.kernel.org/stable/c/b4c928ace9a123629eeb14ec5d7ee8f73e5ac668 (opens in a new tab)
- https://git.kernel.org/stable/c/46fcb0fc884db78a0384be92cc2a51927e6581b8 (opens in a new tab)
- https://git.kernel.org/stable/c/cd2a50d0a097a42b6de283377da98ff757505120 (opens in a new tab)
- https://git.kernel.org/stable/c/828f57ac75eaccd6607ee4d1468d34e983e32c68 (opens in a new tab)
- https://git.kernel.org/stable/c/d957e7ffb2c72410bcc1a514153a46719255a5da (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
[](https://trackcve.app/cve/CVE-2022-49986)Record last updated .