CVE-2026-18220— Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
Quick assessment
Affected
Red Hat Red Hat Enterprise Linux 10
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 3 AI
T1055 · Process Injection T1059 · Command and Scripting Interpreter T1190 · Exploit Public-Facing ApplicationAffected Version Matrix 23
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | any |
unaffected |
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 6 | any |
unaffected |
| Red Hat | Red Hat Enterprise Linux 7 | any |
unaffected |
any |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 8 | any |
unaffected |
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
| Red Hat | Red Hat Enterprise Linux 9 | any |
unaffected |
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
any |
unaffected | ||
| Red Hat | Red Hat Hardened Images | any |
affected |
| Red Hat | Red Hat OpenShift Container Platform 4 | any |
unaffected |
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I. Basic Information for CVE-2026-18220
Vulnerability Information
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Vulnerability Title
Binutils: binutils: out-of-bounds write in bfd dlx elf backend relocation processing
Source: CVE Program / CVE List V5
Vulnerability 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).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
GNU Binutils 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 10 | - |
cpe:/o:redhat:enterprise_linux:10
|
|
| Red Hat | Red Hat Enterprise Linux 6 | - |
cpe:/o:redhat:enterprise_linux:6
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 7 | - |
cpe:/o:redhat:enterprise_linux:7
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 8 | - |
cpe:/o:redhat:enterprise_linux:8
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Enterprise Linux 9 | - |
cpe:/o:redhat:enterprise_linux:9
|
|
| Red Hat | Red Hat Hardened Images | - |
cpe:/a:redhat:hummingbird:1
|
|
| Red Hat | Red Hat OpenShift Container Platform 4 | - |
cpe:/a:redhat:openshift:4
|
|
II. Public POCs for CVE-2026-18220
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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No public POC found.
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Vendor Advisories for CVE-2026-18220 (2)
Same Patch Batch · Red Hat · 2026-07-29 · 4 CVEs total
| CVE-2026-18255 | 7.2 HIGH | Quay: quay: global read-only superuser can view robot account tokens |
| CVE-2026-18207 | 6.5 MEDIUM | Keycloak-services: keycloak-services: client policy source-group condition bypass via dupl |
| CVE-2026-18201 | 5.5 MEDIUM | Keycloak-services: keycloak-services: generic identity-provider creation can bind brokers |
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