SB20260816126 - Improper control of a resource through its lifetime in Linux kernel netfilter

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-72249)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

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.

The vulnerability exists due to improper resource management in nf_flow_tunnel_ipip_push and related flowtable tunnel header handling in netfilter when processing flow offload traffic with IPIP encapsulation. A local user can trigger packet processing that uses the route from the opposite direction to calculate headroom, causing a denial of service.

The issue affects headroom calculation and ip header fragmentation state during flowtable tunnel encapsulation.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/c328b90c17fc5fa7786503695152880b2afb9326
• https://git.kernel.org/stable/c/ecb78fbb03d3f86e2e93767875e273308086a424