SB20260816481 - Improper access control in Linux kernel ipv6

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Main Vulnerability Database SB20260816481

SB20260816481 - Improper access control in Linux kernel ipv6

Published: August 16, 2026

Security Bulletin ID SB20260816481
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-2026-72055)

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 tunnel configuration across network namespaces.

The vulnerability exists due to improper access control in vti6_changelink() in the ip6_vti component when handling changelink requests for a tunnel device associated with another network namespace. A local privileged user can send a changelink request from a namespace where they hold CAP_NET_ADMIN to modify tunnel configuration across network namespaces.

The issue arises when the device network namespace and the tunnel link network namespace differ.


Remediation

Install update from vendor's website.

References