CVE-2022-49575

Local service interruption via TCP sysctl race

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in the Linux kernel allows local users to interrupt service by changing a TCP thin-stream sysctl during timer processing. The TCP retransmission timer in net/ipv4/tcp_timer.c reads sysctl_tcp_thin_linear_timeouts without READ_ONCE(), allowing a concurrent sysctl write to create an unsynchronized shared-variable access. Low-privilege local access and a timing race are required; published scoring reports availability impact only, without a specified failure mode.

CVSS severity4.7
Medium
EPSS probability0.19%
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 the Linux kernel allows local users to interrupt service by changing a TCP thin-stream sysctl during timer processing. The TCP retransmission timer in net/ipv4/tcp_timer.c reads sysctl_tcp_thin_linear_timeouts without READ_ONCE(), allowing a concurrent sysctl write to create an unsynchronized shared-variable access. Low-privilege local access and a timing race are required; published scoring reports availability impact only, without a specified failure mode.

The record

CVE
CVE-2022-49575
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

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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=2.6.34
  2. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <404c53ccdebd11f96954f4070cffac8e0b4d5cb6
  3. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <492f3713b282c0e67e951cd804edd22eccc25412
  4. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <7c6f2a86ca590d5187a073d987e9599985fb1c7c
  5. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <a0f96c4f179cb3560078cefccef105e8f1701210
  6. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <cc133e4f4bc225079198192623945bb872c08143
  7. Affected versionversion=36e31b0af58728071e8023cf8e20c5166b700717 <f4b0295be9a3c4260de4585fac4062e602a88ac7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.34; version=36e31b0af58728071e8023cf8e20c5166b700717 <404c53ccdebd11f96954f4070cffac8e0b4d5cb6; version=36e31b0af58728071e8023cf8e20c5166b700717 <492f3713b282c0e67e951cd804edd22eccc25412; version=36e31b0af58728071e8023cf8e20c5166b700717 <7c6f2a86ca590d5187a073d987e9599985fb1c7c; version=36e31b0af58728071e8023cf8e20c5166b700717 <a0f96c4f179cb3560078cefccef105e8f1701210; version=36e31b0af58728071e8023cf8e20c5166b700717 <cc133e4f4bc225079198192623945bb872c08143; version=36e31b0af58728071e8023cf8e20c5166b700717 <f4b0295be9a3c4260de4585fac4062e602a88ac7

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
4.7CISA-ADPCVSS: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.

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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-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

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Your stack

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