CVE-2018-12886

Published: 22 May 2019

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.

Priority

Low

CVSS 3 base score: 8.1

Status

Notes

Upstream has fixed this in GCC9 only as of 2019-05-30.
32-bit ARM only, risky backport, and would require archive
rebuild.
Setting priority as low for now, we may decide this issue is
not worth fixing in stable releases.

References

• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-12886
• NVD
• Launchpad
• Debian

Bugs

• https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85434