CVE-2022-49599

Service interruption via unsynchronized TCP sysctl reads

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in the Linux kernel allows local users to interrupt service through concurrent access to a TCP sysctl. Readers of sysctl_tcp_l3mdev_accept in include/net/inet_hashtables.h and include/net/inet_sock.h access the shared setting without READ_ONCE(), so a concurrent write can produce an inconsistent read. Successful triggering requires local low-privilege access and a difficult timing race; the documented consequence is limited to availability.

CVSS severity4.7
Medium
EPSS probability0.20%
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 allows local users to interrupt service through concurrent access to a TCP sysctl. Readers of sysctl_tcp_l3mdev_accept in include/net/inet_hashtables.h and include/net/inet_sock.h access the shared setting without READ_ONCE(), so a concurrent write can produce an inconsistent read. Successful triggering requires local low-privilege access and a difficult timing race; the documented consequence is limited to availability.

The record

CVE
CVE-2022-49599
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, T1499.004
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=4.5
  2. Affected versionversion=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <08a75f10679470552a3a443f9aefd1399604d31d
  3. Affected versionversion=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <1d9c81833dec46ccb52a1d0db970fefb7c4fa071
  4. Affected versionversion=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <7d38d86b818104cf88961f3aebea34da89364a8e
  5. Affected versionversion=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <9ba9cd43b5776c27d25e5a32dde9e80bdeb1c6a1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.5; version=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <08a75f10679470552a3a443f9aefd1399604d31d; version=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <1d9c81833dec46ccb52a1d0db970fefb7c4fa071; version=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <7d38d86b818104cf88961f3aebea34da89364a8e; version=6dd9a14e92e54895e143f10fef4d0b9abe109aa9 <9ba9cd43b5776c27d25e5a32dde9e80bdeb1c6a1

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')
T1499.004Application or System Exploitation

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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