A PoC/exploit has been discovered for vulnerability CVE-2026-18220 PT ID: PT-2026-65773 Vendor: Red Hat Product: Red Hat Enterprise Linux 10 Description: An out-of-bounds write vulnerability was found in the BFD library's DLX ELF backend (bfd/elf32-dlx.c) in GNU binutils. The dlx_rtype_to_howto() function maps ELF relocation types to internal howto structures but fails to perform adequate bounds checking on attacker-controlled relocation type values (via ELF32_R_TYPE(r_info)) before indexing into the dlx_elf_howto_table[] array. The DLX relocation type number space is non-contiguous (basic types 0-6, extended types at 0x10000+), but the default case in the switch statement allows arbitrary index values to reach the array access. A specially crafted ELF/DLX object file can trigger this out-of-bounds write when processed by any BFD-consuming tool (objdump, readelf, strip, ld, nm, objcopy). The vulnerability has been demonstrated to achieve arbitrary code execution via a File Stream Oriented Programming (FSOP) attack against glibc FILE structures (stderr), redirecting control flow to system(). Attack scenarios include CI/CD pipelines performing automated binary analysis, developer workstations running objdump/readelf on untrusted binaries, automated security scanning or malware analysis tools invoking binutils, and package build systems processing third-party code. Note: This vulnerability is only exploitable when binutils is built with the DLX backend enabled (typically via --enable-targets=all). References: • https://dbugs.ptsecurity.com/vulnerability/PT-2026-65773 • https://github.com/4d4j/objdump-out-of-bounds-write #dbugs_vuln
Post summary
A publicly‑available proof‑of‑concept exploit demonstrates that CVE‑2026‑18220 can lead to arbitrary code execution via a FSOP attack in the DLX backend of GNU binutils.
