CVE-2022-49572

Local service interruption via TCP sysctl race

Published Feb 26, 2025 · Updated May 11, 2026

A race condition in the Linux kernel TCP stack allows local users to interrupt service through concurrent sysctl changes. The TCP readers in include/net/tcp.h and net/ipv4/tcp_output.c access sysctl_tcp_slow_start_after_idle without READ_ONCE while it can change concurrently. Exploitation requires low-privileged local access and a high-complexity race; the bounded reported consequence is availability loss.

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

A race condition in the Linux kernel TCP stack allows local users to interrupt service through concurrent sysctl changes. The TCP readers in include/net/tcp.h and net/ipv4/tcp_output.c access sysctl_tcp_slow_start_after_idle without READ_ONCE while it can change concurrently. Exploitation requires low-privileged local access and a high-complexity race; the bounded reported consequence is availability loss.

The record

CVE
CVE-2022-49572
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=2.6.18
  2. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <0e3f82a03ec8c3808e87283e12946227415706c9
  3. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <369d99c2b89f54473adcf9acdf40ea562b5a6e0e
  4. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <3b26e11b07a09b31247688bec61e2925d4a571b6
  5. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <41aeba4506f6b70ec7500c6fe202731a4ba29fe5
  6. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <4845b5713ab18a1bb6e31d1fbb4d600240b8b691
  7. Affected versionversion=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <68b6f9506747d507c7bfa374d178929b4157e8c6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.18; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <0e3f82a03ec8c3808e87283e12946227415706c9; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <369d99c2b89f54473adcf9acdf40ea562b5a6e0e; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <3b26e11b07a09b31247688bec61e2925d4a571b6; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <41aeba4506f6b70ec7500c6fe202731a4ba29fe5; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <4845b5713ab18a1bb6e31d1fbb4d600240b8b691; version=35089bb203f44e33b6bbb6c4de0b0708f9a48921 <68b6f9506747d507c7bfa374d178929b4157e8c6

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.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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