CVE-2022-50177

RCU test failure via mistimed ksoftirqd boosting

Published Jun 18, 2025 · Updated May 11, 2026

Availability failure in Linux kernel 5.14 allows local users to disrupt RCU torture tests through CPU-hotplug and boosting races. rcutorture boosts only ksoftirqd threads online during initialization and starts rcu_torture_boost threads before remaining ksoftirqd threads receive FIFO priority. Reachability requires CONFIG_RCU_BOOST and the rcutorture test configuration; the observed consequence is a kernel warning and failed test boosting, not data access or privilege gain.

CVSS severity5.5
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Availability failure in Linux kernel 5.14 allows local users to disrupt RCU torture tests through CPU-hotplug and boosting races. rcutorture boosts only ksoftirqd threads online during initialization and starts rcu_torture_boost threads before remaining ksoftirqd threads receive FIFO priority. Reachability requires CONFIG_RCU_BOOST and the rcutorture test configuration; the observed consequence is a kernel warning and failed test boosting, not data access or privilege gain.

The record

CVE
CVE-2022-50177
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
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=5.14
  2. Affected versionversion=ea6d962e80b61996aeacb443661cc3adcb605315 <3002153a91a9732a6d1d0bb95138593c7da15743
  3. Affected versionversion=ea6d962e80b61996aeacb443661cc3adcb605315 <621595f771a6bd458ffbc40679e222ba5d0a7a1e
  4. Affected versionversion=ea6d962e80b61996aeacb443661cc3adcb605315 <7e7472c62c6ded322afd9d5ac8bb20a08e7c5674
  5. Affected versionversion=ea6d962e80b61996aeacb443661cc3adcb605315 <8e84693621f53bf894af9905a6531e0530402145

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.14; version=ea6d962e80b61996aeacb443661cc3adcb605315 <3002153a91a9732a6d1d0bb95138593c7da15743; version=ea6d962e80b61996aeacb443661cc3adcb605315 <621595f771a6bd458ffbc40679e222ba5d0a7a1e; version=ea6d962e80b61996aeacb443661cc3adcb605315 <7e7472c62c6ded322afd9d5ac8bb20a08e7c5674; version=ea6d962e80b61996aeacb443661cc3adcb605315 <8e84693621f53bf894af9905a6531e0530402145

Published CVSS scores

5.5UbuntuCVSS: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

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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