SB20260816479 - Improper access control in Linux kernel ipv4

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Main Vulnerability Database SB20260816479

SB20260816479 - Improper access control in Linux kernel ipv4

Published: August 16, 2026

Security Bulletin ID SB20260816479
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Data manipulation

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper access control (CVE-ID: CVE-2026-72053)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local privileged user to modify IPIP tunnel configuration in another network namespace.

The vulnerability exists due to improper access control in ipip_changelink() in net/ipv4/ipip.c when handling changelink requests for an IPIP device whose tunnel link resides in a different network namespace. A local privileged user can send a changelink request from a network namespace where they have CAP_NET_ADMIN to modify IPIP tunnel configuration in another network namespace.

The issue occurs when dev_net(dev) and the tunnel link namespace differ, such as after the device is created in or moved to a different network namespace.


Remediation

Install update from vendor's website.

References