Integer overflow in Linux kernel - CVE-2026-80978
Published: September 12, 2026
Vulnerability identifier: #VU149411
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-80978
CWE-ID: CWE-190
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause skb header offsets to wrap.
The vulnerability exists due to an integer overflow in IP tunnel device headroom configuration when configuring a stack of user-created IP tunnel devices. A local user can create a stacked tunnel-device configuration with excessive headroom to cause skb header offsets to wrap.
The affected skb header offsets use a 16-bit representation.
Affected software
Linux kernel
How to mitigate CVE-2026-80978
Install security update from vendor's repository.