Buffer Overflow Vulnerability in GNU Binutils Affects Local Users
CVE-2026-90803

4.8MEDIUM

Key Information:

Vendor

Gnu
Status
Binutils
Vendor
CVE Published:
14 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90803?

A critical buffer overflow vulnerability has been identified in GNU Binutils version 2.47, specifically in the 'elf_x86_64_relocate_section' function within the 'bfd/elf64-x86-64.c' file. This vulnerability arises from improper handling of the roff argument, allowing local attackers to exploit the flaw. Public disclosures of the exploit associated with this vulnerability have already occurred, leading to potential risks for users running the affected version. It is essential to upgrade to version 2.48 or later, which includes a patch (ID: 471130b39c03623ec6d78ece377ff4da3f6bfe7b) that mitigates this security issue.

Affected Version(s)

Binutils 2.47

Binutils 2.48

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-90803 - Proof of Concept

References

https://vuldb.com/vuln/403305
vdb-entrytechnical-description
https://vuldb.com/vuln/403305/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90803
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Dem0000000 (VulDB User)
.