CVE-2022-49124

Host crash via fast-string-copy machine check

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel before 5.17.3 allows local users to crash affected x86 hosts by triggering a machine check. On Skylake, Cascade Lake, and Cooper Lake CPUs, REP MOVS consumes an uncorrectable error from the cache line after copy_page's requested region, while normal MCE handling leaves fast string copy enabled for a repeat access. Exploitation requires a suitably placed uncorrected memory error and adjacent page-copy activity; a resulting panic interrupts the entire host.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel before 5.17.3 allows local users to crash affected x86 hosts by triggering a machine check. On Skylake, Cascade Lake, and Cooper Lake CPUs, REP MOVS consumes an uncorrectable error from the cache line after copy_page's requested region, while normal MCE handling leaves fast string copy enabled for a repeat access. Exploitation requires a suitably placed uncorrected memory error and adjacent page-copy activity; a resulting panic interrupts the entire host.

The record

CVE
CVE-2022-49124
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=2.6.19
  2. Affected versionversion=27fbe5b28a2ffef171c6005f304ea4f80fcdcc01 <8ca97812c3c830573f965a07bbd84223e8c5f5bd
  3. Affected versionversion=27fbe5b28a2ffef171c6005f304ea4f80fcdcc01 <ba37c73be3d5632f6fb9fa20b250ce45560ca85d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=27fbe5b28a2ffef171c6005f304ea4f80fcdcc01 <8ca97812c3c830573f965a07bbd84223e8c5f5bd; version=27fbe5b28a2ffef171c6005f304ea4f80fcdcc01 <ba37c73be3d5632f6fb9fa20b250ce45560ca85d

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

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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