CVE-2026-15003 in Red Hat
Summary
by MITRE • 07/27/2026
A flaw was found in the GNU Binutils (Binary Utilities) linker. This vulnerability, a heap-buffer-overflow read (CWE-125), occurs when the linker processes a specially crafted 32-bit XCOFF (Extended Common Object File Format) object file. An attacker could exploit this by providing a malicious file, leading to an out-of-bounds read of memory. This can result in information disclosure, potentially revealing sensitive heap data, and a Denial of Service (DoS) due to the linker crashing.
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Analysis
by VulDB Data Team • 07/27/2026
The vulnerability under examination resides within GNU Binutils, specifically affecting the linker component that handles binary object file processing. This flaw represents a critical heap buffer overflow condition classified as CWE-125, which manifests during the parsing of 32-bit XCOFF formatted object files. The XCOFF format is commonly used on IBM AIX systems and other platforms supporting this object file standard, making this vulnerability particularly concerning for environments relying on such binary formats.
The technical implementation of this vulnerability occurs when the linker encounters malformed input within the XCOFF object file structure. During parsing operations, the linker allocates memory buffers to process various sections of the object file but fails to properly validate bounds when reading data from the extended common object file format. This improper boundary checking allows an attacker to craft a malicious XCOFF file that triggers an out-of-bounds read condition in the heap memory region.
From an operational impact perspective, this vulnerability creates multiple security risks that align with several ATT&CK tactics including privilege escalation and defense evasion. The information disclosure aspect enables attackers to potentially extract sensitive heap data that may contain cryptographic keys, memory addresses, or other confidential information processed by the linker. Additionally, the denial of service condition occurs when the malformed input causes the linker process to crash, effectively preventing legitimate compilation operations from completing successfully.
The exploitation vector requires an attacker to craft a malicious 32-bit XCOFF object file that specifically triggers the buffer overflow condition during linking operations. This attack scenario typically occurs in build environments where third-party libraries or code modules are processed through the affected linker. The vulnerability's impact extends beyond simple compilation failures as it represents a potential information leakage mechanism that could be leveraged for further attacks.
Mitigation strategies should focus on implementing proper input validation and bounds checking within the linker component, with immediate updates to GNU Binutils addressing this specific heap buffer overflow condition. Organizations should also consider implementing runtime protections including address space layout randomization and stack canaries to reduce exploitability. The ATT&CK framework suggests that defensive measures should include monitoring for unusual linking patterns and implementing strict file validation policies for object files processed through build systems.
Security teams should prioritize patching affected systems while maintaining awareness of potential exploitation attempts targeting this specific vulnerability in environments handling XCOFF formatted binary objects. The vulnerability demonstrates the importance of proper memory management practices in system utilities and highlights risks associated with processing untrusted binary input formats. Regular security assessments of build infrastructure and object file handling processes can help identify additional exposure points that may interact with similar buffer overflow conditions.