Incorrect Calculation of Buffer Size in Linux kernel - CVE-2026-80615
Published: August 28, 2026
Vulnerability identifier: #VU146263
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-2026-80615
CWE-ID: CWE-131
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 buffer size validation in tun_dst_unclone() in dst_metadata when processing tunnel metadata options. A local user can trigger copying of crafted metadata with options to cause a denial of service.
The issue is triggered on systems built with clang and source fortification enabled.
Affected software
Linux kernel
How to mitigate CVE-2026-80615
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3