CVE-2025-1176

What it actually does

Heap-based buffer overflow in the _bfd_elf_gc_mark_rsec function within elflink.c of the ld linker component when processing ELF object files.

Why it matters to the business

Compromise or disruption of software build and linking pipelines can halt development workflows, introduce corrupted artifacts into releases, or enable attacker code execution on developer and CI systems.

How an attack unfolds

An attacker crafts a malicious ELF object file that triggers the buffer overflow during garbage-collection section marking inside ld; successful exploitation requires precise heap layout control and is further complicated by the need to deliver the file to a victim linker invocation.

How to fix it

Apply the upstream patch f9978defb6fab0bd8583942d97c112b0932ac814 or upgrade GNU Binutils to a release containing the fix; rebuild all dependent toolchains and CI images with the patched version.

How to confirm the fix worked

Confirm the patched commit is present in the source tree, rebuild ld, and verify that the vulnerable function no longer exhibits the overflow on the original proof-of-concept ELF input.

Typical attack path

1. Craft malicious ELF object file targeting _bfd_elf_gc_mark_rsec
2. Deliver file to victim via build dependency, source archive, or shared repository
3. Victim invokes ld (directly or via compiler driver) on the file
4. Overflow occurs during section marking, enabling control-flow hijack or crash

How to detect it

Monitor build logs and CI systems for ld segmentation faults or heap-related error messages; inspect core dumps from linker processes for signs of buffer overflow during ELF processing.

What your security team should do

• Prioritize patching of all GNU Binutils installations used in build environments within the next sprint
• Scan source repositories and dependency manifests for references to vulnerable Binutils versions
• Add ld crash and heap-corruption alerts to CI monitoring pipelines