CVE-2022-49573

Local system crash via unsynchronized TCP sysctl read

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in Linux kernel releases from 3.5 allows local users to crash the system through concurrent early-retransmit sysctl access. The tcp_schedule_loss_probe function in net/ipv4/tcp_output.c reads sysctl_tcp_early_retrans without READ_ONCE while another execution context can change it. Exploitation requires low-privileged local access and precise timing; the documented consequence is availability loss, with no confidentiality or integrity impact.

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 releases from 3.5 allows local users to crash the system through concurrent early-retransmit sysctl access. The tcp_schedule_loss_probe function in net/ipv4/tcp_output.c reads sysctl_tcp_early_retrans without READ_ONCE while another execution context can change it. Exploitation requires low-privileged local access and precise timing; the documented consequence is availability loss, with no confidentiality or integrity impact.

The record

CVE
CVE-2022-49573
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=3.5
  2. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <11e8b013d16e5db63f8f76acceb5b86964098aaa
  3. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <488d3ad98ef7cddce7054193dbae6b4349c6807d
  4. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <5037ca9e4b169cc9aed0174d658c3d81fdaf8ea5
  5. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <52e65865deb6a36718a463030500f16530eaab74
  6. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <83767fe800a311370330d4ec83aa76093b744a80
  7. Affected versionversion=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <d5975f6376ce90c2c483ae36bf88c9cface4c13b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <11e8b013d16e5db63f8f76acceb5b86964098aaa; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <488d3ad98ef7cddce7054193dbae6b4349c6807d; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <5037ca9e4b169cc9aed0174d658c3d81fdaf8ea5; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <52e65865deb6a36718a463030500f16530eaab74; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <83767fe800a311370330d4ec83aa76093b744a80; version=eed530b6c67624db3f2cf477bac7c4d005d8f7ba <d5975f6376ce90c2c483ae36bf88c9cface4c13b

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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