CVE-2022-49595

Unspecified impact via TCP sysctl data race

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in the Linux kernel TCP output path allows local users to cause unspecified impact by racing a TCP sysctl access. The reader in net/ipv4/tcp_output.c accesses sysctl_tcp_probe_threshold without READ_ONCE(), so a concurrent sysctl write races with the load. Low privileges and precise concurrency are required; public sources do not identify whether the outcome is a hang, crash, reboot, or shutdown.

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 TCP output path allows local users to cause unspecified impact by racing a TCP sysctl access. The reader in net/ipv4/tcp_output.c accesses sysctl_tcp_probe_threshold without READ_ONCE(), so a concurrent sysctl write races with the load. Low privileges and precise concurrency are required; public sources do not identify whether the outcome is a hang, crash, reboot, or shutdown.

The record

CVE
CVE-2022-49595
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
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=4.1
  2. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <44768749980d53bc01980d9c060f736808d11af0
  3. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <92c0aa4175474483d6cf373314343d4e624e882a
  4. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <96900fa61777402eb5056269d8000aace33a8b6c
  5. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <9b5dc7ad6da1373d3c60d4b869d688f996e5d219
  6. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <b04817c94fbd285a967d9b830b274fe9998c9c0b
  7. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <d452ce36f2d4c402fa3f5275c9677f80166e7fc6
  8. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <f524c3e7f6cdad66b3b6a912cef47b656f8b0de3
  9. Affected versionversion=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <fa5fb2cf9393db898772db8cb897ed5fd265eb78

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.1; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <44768749980d53bc01980d9c060f736808d11af0; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <92c0aa4175474483d6cf373314343d4e624e882a; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <96900fa61777402eb5056269d8000aace33a8b6c; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <9b5dc7ad6da1373d3c60d4b869d688f996e5d219; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <b04817c94fbd285a967d9b830b274fe9998c9c0b; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <d452ce36f2d4c402fa3f5275c9677f80166e7fc6; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <f524c3e7f6cdad66b3b6a912cef47b656f8b0de3; version=6b58e0a5f32dedb609438bb9c9c82aa6e23381f2 <fa5fb2cf9393db898772db8cb897ed5fd265eb78

Published CVSS scores

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')

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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