Always-Incorrect Control Flow Implementation in Linux kernel - CVE-2026-53346
Published: July 2, 2026
Vulnerability identifier: #VU136703
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-2026-53346
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 a denial of service.
The vulnerability exists due to improper generation of unwind table metadata in arm64 Rust build handling when booting a kernel with CONFIG_UNWIND_PATCH_PAC_INTO_SCS enabled. A local user can execute code in a vulnerable kernel build to trigger a crash during boot.
The issue affects compiler-generated constructors such as kasan constructors, where incorrect dwarf information can cause illegal patching of paciasp and autiasp instructions.
How to mitigate CVE-2026-53346
Install security update from vendor's repository.