CVE-2022-49903

Kernel warning via failed proc initialization

Published May 1, 2025 · Updated May 11, 2026

Improper cleanup in the Linux kernel IPv6 route subsystem allows local users to trigger a kernel warning during network-namespace teardown. ip6_route_net_init_late reports success when proc_create_net fails for ipv6_route or rt6_stats, so ip6_route_net_exit_late later removes a nonexistent entry. Local low-privileged access and a proc-entry creation failure are required; the published record documents the warning, not a crash or privilege gain.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper cleanup in the Linux kernel IPv6 route subsystem allows local users to trigger a kernel warning during network-namespace teardown. ip6_route_net_init_late reports success when proc_create_net fails for ipv6_route or rt6_stats, so ip6_route_net_exit_late later removes a nonexistent entry. Local low-privileged access and a proc-entry creation failure are required; the published record documents the warning, not a crash or privilege gain.

The record

CVE
CVE-2022-49903
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
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=2.6.26
  2. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <080589287127838046077904f34d5054ea0f895c
  3. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <0ed71af4d017d2bd2cbb8f7254f613a4914def26
  4. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <381453770f731f0f43616a1cd4c759b7807a1517
  5. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <5dbb47ee89762da433cd8458788d7640c85f1a07
  6. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <768b3c745fe5789f2430bdab02f35a9ad1148d97
  7. Affected versionversion=cdb1876192dbe680b3ac955717fdf7f863c1762d <83fbf246ced54dadd7b9adc2a16efeff30ba944d

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.26; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <080589287127838046077904f34d5054ea0f895c; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <0ed71af4d017d2bd2cbb8f7254f613a4914def26; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <381453770f731f0f43616a1cd4c759b7807a1517; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <5dbb47ee89762da433cd8458788d7640c85f1a07; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <768b3c745fe5789f2430bdab02f35a9ad1148d97; version=cdb1876192dbe680b3ac955717fdf7f863c1762d <83fbf246ced54dadd7b9adc2a16efeff30ba944d

Published CVSS scores

5.5NIST NVDCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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