CVE-2026-72208 in Linux
Summary
by MITRE • 08/15/2026
In the Linux kernel, the following vulnerability has been resolved:
ntfs: add bounds check before accessing EA entries
in ntfs_ea_lookup and ntfs_listxattr, this verifies that there is enough space in the EA entry before accessing the next_entry_offset field of the EA entry.
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Analysis
by VulDB Data Team • 08/15/2026
The vulnerability addressed in this linux kernel patch represents a critical bounds checking issue within the ntfs file system implementation that could potentially lead to arbitrary code execution or system compromise. This flaw exists specifically within the ntfs_ea_lookup and ntfs_listxattr functions, which are responsible for handling extended attributes in ntfs file systems. The vulnerability stems from insufficient validation of data structures before memory access operations, creating a potential pathway for attackers to exploit memory corruption issues.
The technical implementation flaw occurs when the ntfs kernel driver processes extended attribute entries without verifying that sufficient data exists before attempting to access the next_entry_offset field. This type of vulnerability falls under the category of buffer over-read conditions as classified by CWE-129 and CWE-787, where the system reads beyond allocated memory boundaries. The absence of proper bounds checking means that malformed or maliciously crafted extended attribute data could cause the kernel to access invalid memory locations, potentially leading to information disclosure, denial of service, or privilege escalation.
From an operational perspective, this vulnerability poses significant risks to systems running ntfs file systems, particularly those with user-accessible extended attributes. Attackers could exploit this weakness by crafting specially formatted extended attributes that would trigger the buffer over-read condition when the kernel attempts to process them. The impact extends beyond simple system stability issues as this type of memory corruption can potentially be leveraged for privilege escalation attacks, allowing malicious actors to gain elevated system privileges. According to ATT&CK framework T1068, this vulnerability could enable local privilege escalation by exploiting kernel memory corruption weaknesses.
The mitigation strategy involves implementing proper bounds checking mechanisms before any access to the next_entry_offset field within extended attribute entries. This patch ensures that the kernel validates sufficient data availability before proceeding with memory operations, preventing potential over-read conditions that could lead to system compromise. The fix aligns with secure coding practices outlined in the CERT Secure Coding Standards for kernel development and addresses fundamental security principles related to input validation and memory safety. System administrators should prioritize applying this kernel update across all systems that utilize ntfs file systems, particularly those with extended attribute functionality enabled, to prevent exploitation of this vulnerability in production environments.
The broader implications of this fix demonstrate the critical importance of proper bounds checking in kernel space code execution, where memory corruption vulnerabilities can have far-reaching consequences. This particular issue highlights how seemingly minor implementation oversights in file system drivers can create significant security risks, emphasizing the need for rigorous code review processes and comprehensive testing of kernel components that handle user-supplied data structures. The vulnerability serves as a reminder of why defensive programming techniques are essential in operating system development, particularly when dealing with complex data parsing operations that must handle various input formats safely.