Improper input validation in Linux kernel - CVE-2026-80738
Published: September 4, 2026
Vulnerability identifier: #VU146926
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-2026-80738
CWE-ID: CWE-20
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 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.
Affected software
Linux kernel
How to mitigate CVE-2026-80738
Install security update from vendor's repository.