#VU125836 Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-31413
Published: April 13, 2026 / Updated: April 17, 2026
Vulnerability identifier: #VU125836
Vulnerability risk: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/U:Clear
CVE-ID: CVE-2026-31413
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to access out-of-bounds map memory.
The vulnerability exists due to improper handling of scalar state forking in maybe_fork_scalars() when processing BPF_OR operations with a constant source operand. A local user can execute a crafted BPF program to access out-of-bounds map memory.
The issue is caused by a verifier/runtime divergence when the destination register has a signed range of [-1, 0].
Remediation
Install security update from vendor's repository.