CVE-2022-49594

Service interruption via incoherent TCP sysctl read

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in affected Linux kernel releases allows local users to interrupt service through concurrent TCP MTU-floor access. The tcp_mtu_probing function reads net->ipv4.sysctl_tcp_mtu_probe_floor while the sysctl can change, without READ_ONCE() enforcing a single coherent access. Exploitation requires local low-privilege access and a difficult race; the documented consequence is limited to availability.

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 affected Linux kernel releases allows local users to interrupt service through concurrent TCP MTU-floor access. The tcp_mtu_probing function reads net->ipv4.sysctl_tcp_mtu_probe_floor while the sysctl can change, without READ_ONCE() enforcing a single coherent access. Exploitation requires local low-privilege access and a difficult race; the documented consequence is limited to availability.

The record

CVE
CVE-2022-49594
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=5.4
  2. Affected versionversion=c04b79b6cfd714144f6a2cf359603d82ee631e62 <033963b220633ed1602d458e7e4ac06afa9fefb2
  3. Affected versionversion=c04b79b6cfd714144f6a2cf359603d82ee631e62 <8e92d4423615a5257d0d871fc067aa561f597deb
  4. Affected versionversion=c04b79b6cfd714144f6a2cf359603d82ee631e62 <cc36c37f5fe066c4708e623ead96dc8f57224bf5
  5. Affected versionversion=c04b79b6cfd714144f6a2cf359603d82ee631e62 <d5bece4df6090395f891110ef52a6f82d16685db
  6. Affected versionversion=c04b79b6cfd714144f6a2cf359603d82ee631e62 <e2ecbf3f0aa88277d43908c53b99399d55729ff9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.4; version=c04b79b6cfd714144f6a2cf359603d82ee631e62 <033963b220633ed1602d458e7e4ac06afa9fefb2; version=c04b79b6cfd714144f6a2cf359603d82ee631e62 <8e92d4423615a5257d0d871fc067aa561f597deb; version=c04b79b6cfd714144f6a2cf359603d82ee631e62 <cc36c37f5fe066c4708e623ead96dc8f57224bf5; version=c04b79b6cfd714144f6a2cf359603d82ee631e62 <d5bece4df6090395f891110ef52a6f82d16685db; version=c04b79b6cfd714144f6a2cf359603d82ee631e62 <e2ecbf3f0aa88277d43908c53b99399d55729ff9

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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