CVE-2022-50206

Kernel crash via concurrent sysctl writes

Published Jun 18, 2025 · Updated Aug 15, 2026

Race condition in Linux arm64 instruction-emulation sysctls allows local users to crash the kernel through concurrent writes. The emulation_proc_handler function temporarily replaces table->data before proc_dointvec_minmax uses it, so a simultaneous invocation can dereference a NULL pointer. Reaching the race requires local low-privileged sysctl write access and simultaneous writes; the demonstrated consequence is a kernel oops and service interruption.

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

Race condition in Linux arm64 instruction-emulation sysctls allows local users to crash the kernel through concurrent writes. The emulation_proc_handler function temporarily replaces table->data before proc_dointvec_minmax uses it, so a simultaneous invocation can dereference a NULL pointer. Reaching the race requires local low-privileged sysctl write access and simultaneous writes; the demonstrated consequence is a kernel oops and service interruption.

The record

CVE
CVE-2022-50206
Published
Jun 18, 2025
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=3.19
  2. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <04549063d5701976034d8c2bfda3d3a8cbf0409f
  3. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <07022e07017ee5540f5559b0aeb916e8383c1e1a
  4. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <353b4673d01c512303c45cf2346f630cda73b5c9
  5. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <6a2fd114678d7fc1b5a0f8865ae98f1c17787455
  6. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <9d5fec6ba2e4117d196a8259ab54615ffe562460
  7. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <af483947d472eccb79e42059276c4deed76f99a6
  8. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <b51881b1da57fe9877125dfdd0aac5172958fcfd
  9. Affected versionversion=587064b610c703f259317d00dc37bf6d40f4fc74 <cc69ef95988b9ef2fc730ec452a7441efb90ef5e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.19; version=587064b610c703f259317d00dc37bf6d40f4fc74 <04549063d5701976034d8c2bfda3d3a8cbf0409f; version=587064b610c703f259317d00dc37bf6d40f4fc74 <07022e07017ee5540f5559b0aeb916e8383c1e1a; version=587064b610c703f259317d00dc37bf6d40f4fc74 <353b4673d01c512303c45cf2346f630cda73b5c9; version=587064b610c703f259317d00dc37bf6d40f4fc74 <6a2fd114678d7fc1b5a0f8865ae98f1c17787455; version=587064b610c703f259317d00dc37bf6d40f4fc74 <9d5fec6ba2e4117d196a8259ab54615ffe562460; version=587064b610c703f259317d00dc37bf6d40f4fc74 <af483947d472eccb79e42059276c4deed76f99a6; version=587064b610c703f259317d00dc37bf6d40f4fc74 <b51881b1da57fe9877125dfdd0aac5172958fcfd; version=587064b610c703f259317d00dc37bf6d40f4fc74 <cc69ef95988b9ef2fc730ec452a7441efb90ef5e

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

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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

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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