CVE-2022-49634

Local service interruption via torn sysctl access

Published Feb 26, 2025 · Updated May 11, 2026

A race condition in the Linux kernel allows local users to interrupt service through concurrent access to an 8-bit sysctl variable. proc_dou8vec_minmax reads and writes the shared byte without READ_ONCE and WRITE_ONCE protection, permitting load or store tearing. Exploitation requires low-privileged local access and a high-complexity race; the published impact is limited to availability.

CVSS severity4.7
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

A race condition in the Linux kernel allows local users to interrupt service through concurrent access to an 8-bit sysctl variable. proc_dou8vec_minmax reads and writes the shared byte without READ_ONCE and WRITE_ONCE protection, permitting load or store tearing. Exploitation requires low-privileged local access and a high-complexity race; the published impact is limited to availability.

The record

CVE
CVE-2022-49634
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=389dab6142d742f91010f38de0f1f2f440b97e1b <f177b382c33900d0e5a9766493c11a1074076f78
  2. Affected versionversion=5.13
  3. Affected versionversion=cb9444130662c6c13022579c861098f212db2562 <5f776daef0b5354615ec4b4234cd9539ca05f273
  4. Affected versionversion=cb9444130662c6c13022579c861098f212db2562 <7dee5d7747a69aa2be41f04c6a7ecfe3ac8cdf18
  5. Affected versionversion=cb9444130662c6c13022579c861098f212db2562 <e58b02e445463065b4078bf621561da75197853f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=389dab6142d742f91010f38de0f1f2f440b97e1b <f177b382c33900d0e5a9766493c11a1074076f78; version=5.13; version=cb9444130662c6c13022579c861098f212db2562 <5f776daef0b5354615ec4b4234cd9539ca05f273; version=cb9444130662c6c13022579c861098f212db2562 <7dee5d7747a69aa2be41f04c6a7ecfe3ac8cdf18; version=cb9444130662c6c13022579c861098f212db2562 <e58b02e445463065b4078bf621561da75197853f

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo