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.
Fix
Patch, vendor advisory and mitigation references on NVD 4
- https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup Vendor Advisory
- https://www.gnu.org/software/gcc/gcc-8/changes.html Exploit, Vendor Advisory
- https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup Vendor Advisory
- https://www.gnu.org/software/gcc/gcc-8/changes.html Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.1 · gnuNVD modified 2026-10-14 07:16
Affected (CPE criteria) 1
cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:*
References 6
- https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup Vendor Advisory
- https://www.gnu.org/software/gcc/gcc-8/changes.html Exploit, Vendor Advisory
- https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup Vendor Advisory
- https://www.gnu.org/software/gcc/gcc-8/changes.html Exploit, Vendor Advisory
- https://cert-portal.siemens.com/productcert/html/ssa-398330.html
- https://cert-portal.siemens.com/productcert/html/ssa-565386.html