CVE-2022-50149

System hang via recursive device lock acquisition

Published Jun 18, 2025 · Updated May 11, 2026

Improper locking in the Linux kernel driver core starting in 5.1 allows local users to hang the system during asynchronous driver attachment. The __driver_attach path holds the device lock while scheduling __driver_attach_async_helper, which reacquires that lock when scheduling falls back to synchronous execution. Reaching the deadlock requires an asynchronous probe and allocation failure or saturation of the async-work limit; the resulting uninterruptible wait blocks driver attachment and can stall system startup.

CVSS severity5.5
Medium
EPSS probability0.13%
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 the Linux kernel driver core starting in 5.1 allows local users to hang the system during asynchronous driver attachment. The __driver_attach path holds the device lock while scheduling __driver_attach_async_helper, which reacquires that lock when scheduling falls back to synchronous execution. Reaching the deadlock requires an asynchronous probe and allocation failure or saturation of the async-work limit; the resulting uninterruptible wait blocks driver attachment and can stall system startup.

The record

CVE
CVE-2022-50149
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
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=5.1
  2. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <37f908038402c9b8325763f306a1c65d88757e15
  3. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <70fe758352cafdee72a7b13bf9db065f9613ced8
  4. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <733ab0c19bf17f6ad7c2b580ede006e369d5ab1b
  5. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <779b634714c51d05baaeff4868ce2fd9fc7399bf
  6. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <8191b6cd9ada09b675f17446d5872eb1f77685cb
  7. Affected versionversion=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <37f908038402c9b8325763f306a1c65d88757e15; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <70fe758352cafdee72a7b13bf9db065f9613ced8; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <733ab0c19bf17f6ad7c2b580ede006e369d5ab1b; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <779b634714c51d05baaeff4868ce2fd9fc7399bf; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <8191b6cd9ada09b675f17446d5872eb1f77685cb; version=ef0ff68351be4fd83bec2d797f0efdc0174a55a4 <a93f33aeef4e6a94ae9c9d3f5b2f9085ad0572ec

Published CVSS scores

5.5NVDCVSS: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
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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