CVE-2022-49589

Availability loss via unsynchronized IGMP sysctl reads

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in Linux kernel IGMP handling allows local users to cause availability loss by changing an IPv4 sysctl concurrently. IGMP readers in net/ipv4/igmp.c and drivers/net/amt.c read net->ipv4.sysctl_igmp_qrv without READ_ONCE(), permitting concurrent writes to produce an inconsistent value. Exploitation requires low-privileged local access and a difficult timing window; published sources do not specify whether the resulting interruption is a hang, crash, or reboot.

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 IGMP handling allows local users to cause availability loss by changing an IPv4 sysctl concurrently. IGMP readers in net/ipv4/igmp.c and drivers/net/amt.c read net->ipv4.sysctl_igmp_qrv without READ_ONCE(), permitting concurrent writes to produce an inconsistent value. Exploitation requires low-privileged local access and a difficult timing window; published sources do not specify whether the resulting interruption is a hang, crash, or reboot.

The record

CVE
CVE-2022-49589
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362, CAPEC-26, 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=3.18
  2. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <8ebcc62c738f68688ee7c6fec2efe5bc6d3d7e60
  3. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <9eeb3a7702998bdccbfcc37997b5dd9215b9a7f7
  4. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <b399ffafffba39f47b731b26a5da1dc0ffc4b3ad
  5. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <c2954671010cd1127d1ffa328c6e6f8e99930982
  6. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <c721324afc589f8ea54bae04756b150aeaae5fa4
  7. Affected versionversion=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <e20dd1b0e0ea15bee1e528536a0840dba972ca0e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.18; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <8ebcc62c738f68688ee7c6fec2efe5bc6d3d7e60; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <9eeb3a7702998bdccbfcc37997b5dd9215b9a7f7; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <b399ffafffba39f47b731b26a5da1dc0ffc4b3ad; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <c2954671010cd1127d1ffa328c6e6f8e99930982; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <c721324afc589f8ea54bae04756b150aeaae5fa4; version=a9fe8e29945d56f35235a3a0fba99b4cf181d211 <e20dd1b0e0ea15bee1e528536a0840dba972ca0e

Published CVSS scores

4.7CISA-ADPCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
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

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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')
CAPEC-26Leveraging Race Conditions
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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