CVE-2022-49771

Service interruption via device-mapper version-list race

Published May 1, 2025 · Updated May 11, 2026

A race condition in Linux kernel device-mapper ioctl code allows local users to interrupt service through concurrent module loading. __list_versions measures target-name storage, releases the target lock, then fills the user buffer using its original length even if a newly loaded target makes the second iteration larger. A local low-privileged user must race DM_LIST_VERSIONS against target-module loading; the resulting size mismatch truncates the ioctl result and disrupts device-mapper operations.

CVSS severity4.3
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

A race condition in Linux kernel device-mapper ioctl code allows local users to interrupt service through concurrent module loading. __list_versions measures target-name storage, releases the target lock, then fills the user buffer using its original length even if a newly loaded target makes the second iteration larger. A local low-privileged user must race DM_LIST_VERSIONS against target-module loading; the resulting size mismatch truncates the ioctl result and disrupts device-mapper operations.

The record

CVE
CVE-2022-49771
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c8d4112df329bf3dfbf27693f918c3b08676538
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a1c35d72dc0b34d1e746ed705790c0f630aa427
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fe1ec995483737f3d2a14c3fe1d8fe634972979
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5398b8e275bf81a2517b327d216c0f37ac9ac5ae
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a818db0d5aecf80d4ba9e10ac153f60adc629ca
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ffce7a92ef5c68f7e5d6f4d722c2f96280c064b
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b545c0e1e4094d4de2bdfe9a3823f9154b0c0005
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f59f5a269ca5e43c567aca7f1f52500a0186e9b7
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0c8d4112df329bf3dfbf27693f918c3b08676538; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3a1c35d72dc0b34d1e746ed705790c0f630aa427; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <4fe1ec995483737f3d2a14c3fe1d8fe634972979; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5398b8e275bf81a2517b327d216c0f37ac9ac5ae; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a818db0d5aecf80d4ba9e10ac153f60adc629ca; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6ffce7a92ef5c68f7e5d6f4d722c2f96280c064b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b545c0e1e4094d4de2bdfe9a3823f9154b0c0005; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f59f5a269ca5e43c567aca7f1f52500a0186e9b7; version=2.6.12

Published CVSS scores

4.3NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

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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