SB20260828180 - Incorrect Calculation of Buffer Size in Linux kernel net
Published: August 28, 2026
Security Bulletin ID
SB20260828180
CSH Severity
Low
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Local access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Incorrect Calculation of Buffer Size (CVE-ID: CVE-2026-80615)
CWE-ID: CWE-131 - Incorrect Calculation of Buffer Size
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 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.
Remediation
Install update from vendor's website.