Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-43070
Published: May 6, 2026
Vulnerability identifier: #VU130220
CSH Severity: Low
CVSS v4.0: 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/E:U/U:Clear
CVE-ID: CVE-2026-43070
CWE-ID: CWE-670
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a local user to cause out-of-bounds memory accesses.
The vulnerability exists due to improper state management in the BPF verifier when processing a BPF_END byte-swap operation. A local user can load a crafted BPF program to cause out-of-bounds memory accesses.
The issue occurs because a register ID is not reset after an in-place byte-swap, allowing verifier bounds learned from the swapped register to be incorrectly propagated to a linked register.
How to mitigate CVE-2026-43070
Install security update from vendor's repository.