SB2026090429 - Improper input validation in Linux kernel core
Published: September 4, 2026
Security Bulletin ID
SB2026090429
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) Improper input validation (CVE-ID: CVE-2026-80738)
CWE-ID: CWE-20 - Improper input validation
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 validation of socket types in the bpf_tcp_gen_syncookie and bpf_tcp_check_syncookie helpers when processing a socket pointer that represents a mini-socket. A local user can invoke the helpers with a mini-socket pointer to cause a denial of service.
Remediation
Install update from vendor's website.