CVE-2022-50549

Storage I/O hang via ABBA lock inversion

Published Oct 7, 2025 · Updated Oct 7, 2025

Improper locking in dm-thin in affected Linux kernel branches allows local users to hang storage I/O through concurrent cleanup paths. dm_pool_abort_metadata holds pmd->root_lock while destroying its buffer client and waiting for shrinker_rwsem, while cache eviction holds shrinker_rwsem and waits for pmd->root_lock in dm_thin_find_block. Local access and overlapping dm-thin cache eviction and metadata failure are required; the resulting tasks remain blocked and storage service is interrupted.

CVSS severity5.5
Medium
EPSS probability0.15%
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 dm-thin in affected Linux kernel branches allows local users to hang storage I/O through concurrent cleanup paths. dm_pool_abort_metadata holds pmd->root_lock while destroying its buffer client and waiting for shrinker_rwsem, while cache eviction holds shrinker_rwsem and waits for pmd->root_lock in dm_thin_find_block. Local access and overlapping dm-thin cache eviction and metadata failure are required; the resulting tasks remain blocked and storage service is interrupted.

The record

CVE
CVE-2022-50549
Published
Oct 7, 2025
Updated
Oct 7, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 7, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 7, 2025Record 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=3.6
  2. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <200aa33b5d781e7c0fa6c0c7db9dbcc3f574ce8f
  3. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <2d891cc5a1706b6908bceb56af7176a463ee6d62
  4. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <7e37578069737b04955c71dd85db8a3bc2709eff
  5. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <8111964f1b8524c4bb56b02cd9c7a37725ea21fd
  6. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <cdf7a39bcc427febbfe3c3b9fe829825ead96c27
  7. Affected versionversion=e49e582965b3694f07a106adc83ddb44aa4f0890 <f8c26c33fef588ee54852cffa7cbb9f9d9869405

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.6; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <200aa33b5d781e7c0fa6c0c7db9dbcc3f574ce8f; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <2d891cc5a1706b6908bceb56af7176a463ee6d62; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <7e37578069737b04955c71dd85db8a3bc2709eff; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <8111964f1b8524c4bb56b02cd9c7a37725ea21fd; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <cdf7a39bcc427febbfe3c3b9fe829825ead96c27; version=e49e582965b3694f07a106adc83ddb44aa4f0890 <f8c26c33fef588ee54852cffa7cbb9f9d9869405

Published CVSS scores

5.5NIST National Vulnerability DatabaseCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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.

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Technologies

Your stack

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Your stack

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