CVE-2022-50771

Kernel warning via preemptible per-CPU read

Published Dec 24, 2025 · Updated Dec 24, 2025

Improper per-CPU access in affected Linux kernels allows local users to trigger a lockdep warning through rcutorture. The rcu_force_quiescent_state() function reads per-CPU state with __this_cpu_read() while execution remains preemptible, rather than using raw_cpu_read(). The demonstrated path requires CONFIG_PREEMPTION=y, rcutorture, and a nonzero fqs_duration parameter; public upstream evidence shows a diagnostic splat rather than data access or code execution.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper per-CPU access in affected Linux kernels allows local users to trigger a lockdep warning through rcutorture. The rcu_force_quiescent_state() function reads per-CPU state with __this_cpu_read() while execution remains preemptible, rather than using raw_cpu_read(). The demonstrated path requires CONFIG_PREEMPTION=y, rcutorture, and a nonzero fqs_duration parameter; public upstream evidence shows a diagnostic splat rather than data access or code execution.

The record

CVE
CVE-2022-50771
Published
Dec 24, 2025
Updated
Dec 24, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 24, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d92527a919edd1aa381bdd6c299dd75a8167396
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80a3e7ab477b3655615fc1627c88c248d4ad28d9
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98a5b1265a36e9d843a51ddd6c9fa02da50d2c57
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a74af9b937707b42c3fd041aae1ed4ce2f337307
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3d92527a919edd1aa381bdd6c299dd75a8167396; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5a52380b8193cf8be6c4a6b94b86ef64ed80c0dc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <80a3e7ab477b3655615fc1627c88c248d4ad28d9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <98a5b1265a36e9d843a51ddd6c9fa02da50d2c57; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a74af9b937707b42c3fd041aae1ed4ce2f337307; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <ceb1c8c9b8aa9199da46a0f29d2d5f08d9b44c15

Published CVSS scores

5.5Red HatCVSS: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

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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