CVE-2022-49986

System hang via storvsc workqueue deadlock

Published Jun 18, 2025 · Updated May 11, 2026

Improper locking in affected Linux kernel releases from 4.15 through 6.0-rc2 allows local users to hang a system during Hyper-V SCSI LUN removal. The storvsc_error_wq queue is incorrectly created with WQ_MEM_RECLAIM, so storvsc_remove_lun can flush a non-reclaim workqueue and deadlock. Reachability requires a Linux guest using the Hyper-V storvsc driver and a SCSI LUN-removal path; reported effects are a dependency warning or hang, with no data access or modification.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in affected Linux kernel releases from 4.15 through 6.0-rc2 allows local users to hang a system during Hyper-V SCSI LUN removal. The storvsc_error_wq queue is incorrectly created with WQ_MEM_RECLAIM, so storvsc_remove_lun can flush a non-reclaim workqueue and deadlock. Reachability requires a Linux guest using the Hyper-V storvsc driver and a SCSI LUN-removal path; reported effects are a dependency warning or hang, with no data access or modification.

The record

CVE
CVE-2022-49986
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.15
  2. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <46fcb0fc884db78a0384be92cc2a51927e6581b8
  3. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <828f57ac75eaccd6607ee4d1468d34e983e32c68
  4. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <b4c928ace9a123629eeb14ec5d7ee8f73e5ac668
  5. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <b692c238ddfa61f00d97c4c1f021425d132ba96f
  6. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <cd2a50d0a097a42b6de283377da98ff757505120
  7. Affected versionversion=436ad941335386c5fc7faa915a8fbdfe8c908084 <d957e7ffb2c72410bcc1a514153a46719255a5da

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.15; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <46fcb0fc884db78a0384be92cc2a51927e6581b8; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <828f57ac75eaccd6607ee4d1468d34e983e32c68; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <b4c928ace9a123629eeb14ec5d7ee8f73e5ac668; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <b692c238ddfa61f00d97c4c1f021425d132ba96f; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <cd2a50d0a097a42b6de283377da98ff757505120; version=436ad941335386c5fc7faa915a8fbdfe8c908084 <d957e7ffb2c72410bcc1a514153a46719255a5da

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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