CVE-2022-49440

System crash via cleared RTAS recoverability state

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel's PowerPC RTAS code allows attackers to crash affected systems during a watchdog interrupt. The enter_rtas path clears the MSR recoverability-interrupt bit while switching execution modes, leaving an interrupt during RTAS without recoverable machine state. The failure requires a PowerPC system to take a watchdog interrupt while executing an RTAS call, and the observed consequence is an unrecoverable system reset.

CVSS severityUnavailable
Unscored
EPSS probability0.26%
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's PowerPC RTAS code allows attackers to crash affected systems during a watchdog interrupt. The enter_rtas path clears the MSR recoverability-interrupt bit while switching execution modes, leaving an interrupt during RTAS without recoverable machine state. The failure requires a PowerPC system to take a watchdog interrupt while executing an RTAS call, and the observed consequence is an unrecoverable system reset.

The record

CVE
CVE-2022-49440
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

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=2.6.34
  2. Affected versionversion=44c9f3cc1a07503b653b571eac5792436da39a30 <5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d
  3. Affected versionversion=44c9f3cc1a07503b653b571eac5792436da39a30 <5f4367448f6817c8a0e94dc9736ed84fa8eee4a3
  4. Affected versionversion=44c9f3cc1a07503b653b571eac5792436da39a30 <b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5
  5. Affected versionversion=44c9f3cc1a07503b653b571eac5792436da39a30 <c9c41f0273826a13ac93124e66a4ff45df281ba0

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=44c9f3cc1a07503b653b571eac5792436da39a30 <5ca40fcf0da0ce2b5bc44e7d8b036535955f2e3d; version=44c9f3cc1a07503b653b571eac5792436da39a30 <5f4367448f6817c8a0e94dc9736ed84fa8eee4a3; version=44c9f3cc1a07503b653b571eac5792436da39a30 <b6b1c3ce06ca438eb24e0f45bf0e63ecad0369f5; version=44c9f3cc1a07503b653b571eac5792436da39a30 <c9c41f0273826a13ac93124e66a4ff45df281ba0

Published CVSS scores

No CVSS assessment is available in this record.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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