CVE-2018-12886: GNU Gcc

High severity, CVSS 8.1. EPSS: 2.2% chance of exploitation in the next 30 days.

stack_protect_prologue in cfgexpand.c and stack_protect_epilogue in function.c in GNU Compiler Collection (GCC) 4.1 through 8 (under certain circumstances) generate instruction sequences when targeting ARM targets that spill the address of the stack protector guard, which allows an attacker to bypass the protection of -fstack-protector, -fstack-protector-all, -fstack-protector-strong, and -fstack-protector-explicit against stack overflow by controlling what the stack canary is compared against.

Affected products

• GNU Gcc: from 4.1, up to and including 8.0

Published 2019-05-22. Last modified 2026-06-17.