Improper input validation in Linux kernel - CVE-2026-98040
Published: September 28, 2026
Vulnerability identifier: #VU152440
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-2026-98040
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 input validation in the BPF verifier's check_cond_jmp_op() function when verifying a crafted BPF program containing a register-form NULL check. A local user can load a crafted BPF program to cause a denial of service.
Affected software
Linux kernel
How to mitigate CVE-2026-98040
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3