CVE-2025-1182: GNU Binutils Memory Corruption RCE Flaw

CVE-2025-1182 Overview

CVE-2025-1182 is a memory corruption vulnerability in GNU Binutils 2.43, specifically within the bfd_elf_reloc_symbol_deleted_p function in bfd/elflink.c. The flaw resides in the ld linker component and is classified under [CWE-119], improper restriction of operations within the bounds of a memory buffer. An attacker can trigger the condition remotely, though the attack complexity is high and successful exploitation is considered difficult. The exploit details have been publicly disclosed, and upstream maintainers have merged a fix identified by commit b425859021d17adf62f06fb904797cf8642986ad.

Critical Impact
Successful exploitation can cause memory corruption in the GNU linker when processing crafted ELF input, potentially disrupting build pipelines and toolchain integrity.

Affected Products

GNU Binutils 2.43
The ld linker component shipped with Binutils
Downstream Linux distributions bundling Binutils 2.43

Discovery Timeline

2025-02-11 - CVE-2025-1182 published to NVD
Patch commit - b425859021d17adf62f06fb904797cf8642986ad merged upstream in the binutils-gdb repository
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2025-1182

Vulnerability Analysis

The vulnerability lives in bfd_elf_reloc_symbol_deleted_p, a function in the Binary File Descriptor (BFD) library used by the GNU linker to decide whether a relocation refers to a symbol that has been removed. When processing malformed or specially crafted ELF relocation data, the function performs memory operations outside the intended buffer bounds, producing a classic memory corruption condition consistent with [CWE-119]. The impact is limited to confidentiality, integrity, and availability of the linker process itself, and the flaw carries an EPSS probability of 0.542%, reflecting a low likelihood of active exploitation.

Root Cause

The root cause is improper bounds checking on relocation and symbol table entries inside bfd/elflink.c. When the linker walks relocation entries and cross-references them with deleted symbols, the loop does not adequately validate the size or offset of the referenced structures. Malformed ELF metadata can drive the function into out-of-bounds memory access, corrupting adjacent state within the BFD library.

Attack Vector

Exploitation requires an attacker to supply a crafted object file or ELF image to a system that then links it with the affected Binutils release. User interaction is required, typically in the form of a developer or CI pipeline running ld against the malicious input. Because linkers are frequently invoked on untrusted third-party artifacts inside build systems, the vector is realistic despite the high attack complexity.

No verified public exploit code is available. See the Sourceware Bug Report and Sourceware Git Commit for authoritative technical details.

Detection Methods for CVE-2025-1182

Indicators of Compromise

Unexpected crashes, segmentation faults, or aborts from ld or other Binutils tools during link steps
Build logs showing BFD library errors while processing external or third-party object files
ELF inputs with malformed relocation sections or references to symbols not present in the symbol table

Detection Strategies

Inventory build hosts and developer workstations for binutils version 2.43 using package managers such as dpkg -l binutils or rpm -q binutils
Run software composition analysis against container images and CI runners to flag the vulnerable version
Validate ELF inputs entering build pipelines with tools like readelf -r to detect anomalous relocation entries before linking

Monitoring Recommendations

Monitor CI/CD systems for repeated linker crashes correlated with specific commits or dependency updates
Log invocations of ld and capture exit codes to surface abnormal terminations for review
Track vendor advisories from downstream distributions for backported fixes referencing commit b425859021d17adf62f06fb904797cf8642986ad

How to Mitigate CVE-2025-1182

Immediate Actions Required

Upgrade to a Binutils build that includes commit b425859021d17adf62f06fb904797cf8642986ad or a later release
Rebuild any container base images, developer VMs, and CI runners that ship Binutils 2.43
Restrict linker invocations to trusted object files and vetted third-party libraries

Patch Information

The upstream fix is available in the binutils-gdb repository as commit b425859021d17adf62f06fb904797cf8642986ad. Refer to the Sourceware Git Commit for the patch diff and the Sourceware Bug Report for the original defect discussion. Downstream distributions typically publish backported packages; consult your vendor's security advisories for exact package versions.

Workarounds

Avoid linking untrusted or attacker-influenced object files with the affected ld version
Isolate build processes inside disposable containers or sandboxes so that a linker compromise does not affect the host
Pin Binutils to a pre-2.43 release that does not contain the vulnerable code path until a patched package is available

bash

# Verify installed Binutils version and confirm remediation
ld --version
apt-cache policy binutils      # Debian / Ubuntu
dnf info binutils              # Fedora / RHEL

# Rebuild from source with the upstream patch applied
git clone git://sourceware.org/git/binutils-gdb.git
cd binutils-gdb
git checkout b425859021d17adf62f06fb904797cf8642986ad
./configure && make && sudo make install