CVE-2026-18220— GNU Binutils 缓冲区错误漏洞

Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing

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).

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

跨界内存写

GNU Binutils 缓冲区错误漏洞

GNU binutils是美国GNU基金会开源的一套二进制工具集程序。 GNU Binutils存在缓冲区错误漏洞，该漏洞源于BFD库的DLX ELF后端（bfd/elf32-dlx.c）中dlx_rtype_to_howto()函数未能对攻击者控制的重定位类型值进行充分边界检查，可能导致越界写入，攻击者可构造特制ELF/DLX对象文件触发此漏洞，进而实现任意代码执行。

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