CVE-2022-49603

Service interruption via unsynchronized forwarding-priority reads

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in the Linux kernel 4.19 allows local users to interrupt service via concurrent access to an IP forwarding sysctl. Readers in ip_forward.c and spectrum_router.c access sysctl_ip_fwd_update_priority without READ_ONCE while it can change concurrently. Low-privilege local access and favorable race timing are required; the public record does not specify whether interruption takes the form of a hang or crash.

CVSS severity4.7
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Race condition in the Linux kernel 4.19 allows local users to interrupt service via concurrent access to an IP forwarding sysctl. Readers in ip_forward.c and spectrum_router.c access sysctl_ip_fwd_update_priority without READ_ONCE while it can change concurrently. Low-privilege local access and favorable race timing are required; the public record does not specify whether interruption takes the form of a hang or crash.

The record

CVE
CVE-2022-49603
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.19
  2. Affected versionversion=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <11038fa781ab916535c53351537b22d6d405667d
  3. Affected versionversion=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <351f81f7d7185d18a9ff76f8f8c2fa8c4eea563b
  4. Affected versionversion=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <7bf9e18d9a5e99e3c83482973557e9f047b051e7
  5. Affected versionversion=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <bcc03369d3277ae075ed421f0c8bf4adb5e65b74

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.19; version=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <11038fa781ab916535c53351537b22d6d405667d; version=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <351f81f7d7185d18a9ff76f8f8c2fa8c4eea563b; version=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <7bf9e18d9a5e99e3c83482973557e9f047b051e7; version=432e05d328921c68c35bfdeff7d7b7400b8e3d1a <bcc03369d3277ae075ed421f0c8bf4adb5e65b74

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo