CVE-2022-49571

Local service interruption via TCP sysctl race

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in Linux kernel TCP reordering code allows local users to interrupt service by racing a network sysctl. The tcp_check_sack_reordering() and tcp_check_reno_reordering() readers access sysctl_tcp_max_reordering without READ_ONCE(), permitting a concurrent write to yield an inconsistent value. Exploitation requires local low-privilege access and a difficult race; service interruption is the published consequence, while the precise failure mode is undisclosed.

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 Linux kernel TCP reordering code allows local users to interrupt service by racing a network sysctl. The tcp_check_sack_reordering() and tcp_check_reno_reordering() readers access sysctl_tcp_max_reordering without READ_ONCE(), permitting a concurrent write to yield an inconsistent value. Exploitation requires local low-privilege access and a difficult race; service interruption is the published consequence, while the precise failure mode is undisclosed.

The record

CVE
CVE-2022-49571
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CAPEC-26, 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=3.19
  2. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <064852663308c801861bd54789d81421fa4c2928
  3. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <46deb91ac8a790286ad6d24cf92e7ab0ab2582bb
  4. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <50a1d3d097503a90cf84ebe120afcde37e9c33b3
  5. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <5e38cee24f19d19280c68f1ac8bf6790d607f60a
  6. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <a11e5b3e7a59fde1a90b0eaeaa82320495cf8cae
  7. Affected versionversion=dca145ffaa8d39ea1904491ac81b92b7049372c0 <ce3731c61589ed73364a5b55ce34131762ef9b60

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.19; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <064852663308c801861bd54789d81421fa4c2928; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <46deb91ac8a790286ad6d24cf92e7ab0ab2582bb; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <50a1d3d097503a90cf84ebe120afcde37e9c33b3; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <5e38cee24f19d19280c68f1ac8bf6790d607f60a; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <a11e5b3e7a59fde1a90b0eaeaa82320495cf8cae; version=dca145ffaa8d39ea1904491ac81b92b7049372c0 <ce3731c61589ed73364a5b55ce34131762ef9b60

Published CVSS scores

4.7NVDCVSS: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')
CAPEC-26Leveraging Race Conditions
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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