CVE-2022-49639

Local service interruption via CIPSO sysctl race

Published Feb 26, 2025 · Updated May 11, 2026

Race condition in Linux kernel CIPSO sysctl handling before 5.19 allows local users to interrupt service through concurrent setting changes. The CIPSO cache lookup and insertion paths read cipso_v4_cache_enabled and cipso_v4_cache_bucketsize without READ_ONCE, so concurrent sysctl writes can race with those reads. Triggering requires local access, low privileges, and precise timing; public sources do not identify the exact trigger sequence.

CVSS severity4.7
Medium
EPSS probability0.18%
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 CIPSO sysctl handling before 5.19 allows local users to interrupt service through concurrent setting changes. The CIPSO cache lookup and insertion paths read cipso_v4_cache_enabled and cipso_v4_cache_bucketsize without READ_ONCE, so concurrent sysctl writes can race with those reads. Triggering requires local access, low privileges, and precise timing; public sources do not identify the exact trigger sequence.

The record

CVE
CVE-2022-49639
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=2.6.19
  2. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <07b0caf8aeb9b82e6ecc6c292a3e47c7fcdb1148
  3. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <0e41a0f73ccb9be112a80bde3804a771633caaef
  4. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <2764f82bbc158d106693ae3ced3675cf4b963b35
  5. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <59e26906b89cc35bb54476498772b45cbc32323f
  6. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <c321e99d2725d11f7e6a4ebd9ce752259f0bae81
  7. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <ca26ca5e2f3eeb3e6fe699cd6effa3b4b2aa8698
  8. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <dd44f04b9214adb68ef5684ae87a81ba03632250
  9. Affected versionversion=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <fe2a35fa2c4f9c8ce5ef970eb927031387f9446a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.19; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <07b0caf8aeb9b82e6ecc6c292a3e47c7fcdb1148; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <0e41a0f73ccb9be112a80bde3804a771633caaef; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <2764f82bbc158d106693ae3ced3675cf4b963b35; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <59e26906b89cc35bb54476498772b45cbc32323f; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <c321e99d2725d11f7e6a4ebd9ce752259f0bae81; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <ca26ca5e2f3eeb3e6fe699cd6effa3b4b2aa8698; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <dd44f04b9214adb68ef5684ae87a81ba03632250; version=446fda4f26822b2d42ab3396aafcedf38a9ff2b6 <fe2a35fa2c4f9c8ce5ef970eb927031387f9446a

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.

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')
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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