Improper input validation in Linux kernel - CVE-2026-98084
Published: September 28, 2026
Vulnerability identifier: #VU152380
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98084
CWE-ID: CWE-20
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause the BPF verifier to accept unsafe programs.
The vulnerability exists due to improper precision propagation in the BPF verifier backtracking logic when verifying repeated bpf_loop() calls with callbacks. A local user can submit a crafted BPF program that repeatedly invokes bpf_loop() to cause the BPF verifier to accept unsafe programs.
Affected software
Linux kernel
How to mitigate CVE-2026-98084
Install security update from vendor's repository.