CVE-2022-50296

Local kernel warning via CPU-mask over-iteration

Published Sep 15, 2025 · Updated Sep 15, 2025

Improper CPU-mask iteration in the Linux User-Mode cpuinfo path allows local users to trigger a kernel warning through /proc/cpuinfo. With CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS enabled, show_cpuinfo iterates to compile-time NR_CPUS instead of runtime nr_cpu_ids, causing cpu_max_bits_warn to report an out-of-range CPU access. The public record establishes a warning and availability impact but does not establish data compromise or an unconditional kernel crash.

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

What happened

Improper CPU-mask iteration in the Linux User-Mode cpuinfo path allows local users to trigger a kernel warning through /proc/cpuinfo. With CONFIG_CPUMASK_OFFSTACK and CONFIG_DEBUG_PER_CPU_MAPS enabled, show_cpuinfo iterates to compile-time NR_CPUS instead of runtime nr_cpu_ids, causing cpu_max_bits_warn to report an out-of-range CPU access. The public record establishes a warning and availability impact but does not establish data compromise or an unconditional kernel crash.

The record

CVE
CVE-2022-50296
Published
Sep 15, 2025
Updated
Sep 15, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 15, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 15, 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 <16c546e148fa6d14a019431436a6f7b4087dbccd
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e3863cc02c156b51b50592d43ffa6a13b680b0d
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5177bdc38eaa1c1ca6302214ab06913540cd00a2
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a73e6edcbf3cdd82796dcdf0c0f5fe5d91021af
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7efe61dc6aa45aab8a40e304fa2dae21e33b0db4
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <844748412be03a236dcf4a208b588162a275e189
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f96aa67c2ccbd7e41b8dc992b8d13cfe206d571
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd251d39b13485eb94ee65bb000d024e02c00e45
  9. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dbd964a733db015bbb9dff592c259c736398140f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <16c546e148fa6d14a019431436a6f7b4087dbccd; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2e3863cc02c156b51b50592d43ffa6a13b680b0d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5177bdc38eaa1c1ca6302214ab06913540cd00a2; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6a73e6edcbf3cdd82796dcdf0c0f5fe5d91021af; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7efe61dc6aa45aab8a40e304fa2dae21e33b0db4; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <844748412be03a236dcf4a208b588162a275e189; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8f96aa67c2ccbd7e41b8dc992b8d13cfe206d571; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cd251d39b13485eb94ee65bb000d024e02c00e45; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <dbd964a733db015bbb9dff592c259c736398140f

Published CVSS scores

5.5NIST NVDCVSS: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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