Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-98044
Published: September 28, 2026
Vulnerability identifier: #VU152421
CSH Severity: Low
CVSS v4: 4.6 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-98044
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local privileged user to cause a BPF verifier warning and make BPF program loading fail.
The vulnerability exists due to improper callback-context validation in the BPF verifier's check_ld_abs() handling when loading a BPF program that uses legacy BPF_LD_ABS or BPF_LD_IND instructions from synchronous callbacks. A local privileged user can load a crafted BPF program to trigger the verifier warning and an -EFAULT BPF_PROG_LOAD failure.
Affected software
Linux kernel
How to mitigate CVE-2026-98044
Install security update from vendor's repository.
Linux kernel - update to 7.0 rc3