TI-2018-09258 Aliases CVE-2018-12886 GHSA-5mwp-7q9c-cgg2

stack_protect_prologue in cfgexpand.c and stack_protect_epilogue in function.c in GNU…

MEDIUM 40CWE-209Published 2019-05-22 · Updated 2026-10-14

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
Impact type: Information disclosure
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-209.

Summary

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.

Why it matters now

EPSS 0.02738 86th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:gnu:gcc::::::::	4.1 – 8.0	Vulnerable	GNU

cpe:2.3:a:gnu:gcc:*:*:*:*:*:*:*:* Versions 4.1 – 8.0 Vulnerable ·GNU

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

Not affected: 5 products

Red Hat Enterprise Linux 4
Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8

Timeline

2026-10-02 Threatist record created from CVE-2018-12886
2026-10-03 Alias added: GHSA-5mwp-7q9c-cgg2
2026-10-14 Priority changed: LOW → MEDIUM

References

Exploit 1

https://www.gnu.org/software/gcc/gcc-8/changes.html

Advisory 1

https://gcc.gnu.org/viewcvs/gcc/trunk/gcc/config/arm/arm-protos.h?revision=266379&view=markup

TI-2023-03747 GCC's-fstack-protector fails to guard dynamically-sized local variables on AArch64 CVSS 3.1MEDIUM 4.8
TI-2019-11913 The POWER9 backend in GNU Compiler Collection (GCC) before version 10 could optimize… CVSS 3.1HIGH 7.5
TI-2008-01316 gcc 4.3.x does not generate a cld instruction while compiling functions used for string… CVSS 2.0HIGH 7.5
TI-2021-15306 GCC c++filt v2.26 was discovered to contain a use-after-free vulnerability via the component cplus-dem.c. CVSS 3.1HIGH 7.8
TI-2000-01207 The -ftrapv compiler option in gcc and g++ 3.3.3 and earlier does not handle all types of… CVSS 2.0HIGH 7.5
TI-2002-02351 Integer overflow in the new[] operator in gcc before 4.8.0 allows attackers to have unspecified impacts. CVSS 3.1HIGH 7.8

See all 13 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences