Improper control of a resource through its lifetime in Linux kernel - CVE-2026-72249
Published: August 16, 2026
Vulnerability identifier: #VU143188
CSH Severity: Low
CVSS v4: 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]
CVE-ID: CVE-2026-72249
CWE-ID: CWE-664
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Linux kernel
How to mitigate CVE-2026-72249
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3