CVE-2022-49918

Local service interruption via failed IPVS initialization

Published May 1, 2025 · Updated May 11, 2026

Improper IPVS initialization in the Linux kernel allows local users to interrupt service during network-namespace cleanup. ip_vs_conn_net_init returns success when either ip_vs_conn or ip_vs_conn_sync proc creation fails, so __ip_vs_cleanup_batch later attempts to remove an entry that does not exist. Exploitation requires low-privileged local access, a proc-entry creation failure, and subsequent cleanup of the affected network namespace.

CVSS severity5.5
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

Improper IPVS initialization in the Linux kernel allows local users to interrupt service during network-namespace cleanup. ip_vs_conn_net_init returns success when either ip_vs_conn or ip_vs_conn_sync proc creation fails, so __ip_vs_cleanup_batch later attempts to remove an entry that does not exist. Exploitation requires low-privileged local access, a proc-entry creation failure, and subsequent cleanup of the affected network namespace.

The record

CVE
CVE-2022-49918
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=2.6.39
  2. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <3d00c6a0da8ddcf75213e004765e4a42acc71d5d
  3. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <5ee2d6b726b0ce339e36569e5849692f4cf4595e
  4. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <7effc4ce3d1434ce6ff286866585a6e905fdbfc1
  5. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <931f56d59c854263b32075bfac56fdb3b1598d1b
  6. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <e724220b826e008764309d2a1f55a9434a4e1530
  7. Affected versionversion=61b1ab4583e275af216c8454b9256de680499b19 <f08ee2aa24c076f81d84e26e213d8c6f4efd9f50

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.39; version=61b1ab4583e275af216c8454b9256de680499b19 <3d00c6a0da8ddcf75213e004765e4a42acc71d5d; version=61b1ab4583e275af216c8454b9256de680499b19 <5ee2d6b726b0ce339e36569e5849692f4cf4595e; version=61b1ab4583e275af216c8454b9256de680499b19 <7effc4ce3d1434ce6ff286866585a6e905fdbfc1; version=61b1ab4583e275af216c8454b9256de680499b19 <931f56d59c854263b32075bfac56fdb3b1598d1b; version=61b1ab4583e275af216c8454b9256de680499b19 <e724220b826e008764309d2a1f55a9434a4e1530; version=61b1ab4583e275af216c8454b9256de680499b19 <f08ee2aa24c076f81d84e26e213d8c6f4efd9f50

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/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

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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