SB2026062307 - Improper access control in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Improper access control (CVE-ID: CVE-2026-52909)

CWE-ID: CWE-284 - Improper Access Control

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to move a fallback tunnel device to another network namespace.

The vulnerability exists due to improper access control in the ip6_vti fallback tunnel device initialization when initializing the per-network-namespace fallback device. A local user can move the ip6_vti0 device to another network namespace to move a fallback tunnel device to another network namespace.

The issue affects the per-netns fallback tunnel device ip6_vti0.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/d289d5307762d1838aaece22c6b6fcad9e8865f9
• https://git.kernel.org/stable/c/dcdce3bc9f08026ff3739ee7339e1bef526fc5f3
• https://git.kernel.org/stable/c/ecf8904067dcba0dad86ece80874841e60317885