SB20261022472 - Uncontrolled Recursion in Linux kernel ipv6

Description

This security bulletin contains information about 1 vulnerability.

1) Uncontrolled Recursion (CVE-ID: CVE-2026-98853)

CWE-ID: CWE-674 - Uncontrolled Recursion

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause a denial of service by exhausting the kernel stack.

The vulnerability exists due to uncontrolled recursion in the Linux kernel's inet_gso_segment() and ipv6_gso_segment() handlers when processing deeply nested IP-in-IP packets during generic segmentation offload. A local user can supply packets with deeply nested IP headers for segmentation to exhaust the kernel stack, potentially causing a system crash.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/006c8b834aed8b02bd8fb9fb05e9e7ead37d1763
• https://git.kernel.org/stable/c/c949646c900e879afce47df1b607fa320eb63bf2