SB2026070257 - Always-Incorrect Control Flow Implementation in Linux kernel arm64

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-53346)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 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

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.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/7de13410f59e59b21d3c268a6e22d40f5d9d8a54
• https://git.kernel.org/stable/c/ac35b5580ace12e5d0a0b5e61e36d2c4e1ffa29c
• https://git.kernel.org/stable/c/bde772ee239720af216fb0b14753971059e132dc
• https://git.kernel.org/stable/c/d0f25a1755f2c15b1746379c8d9d7dfde85f58f5