CVE-2025-68727 in Linux
Summary
by MITRE • 12/24/2025
In the Linux kernel, the following vulnerability has been resolved:
ntfs3: Fix uninit buffer allocated by __getname()
Fix uninit errors caused after buffer allocation given to 'de'; by initializing the buffer with zeroes. The fix was found by using KMSAN.
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Analysis
by VulDB Data Team • 01/12/2026
The vulnerability identified as CVE-2025-68727 represents a critical uninitialized buffer issue within the ntfs3 filesystem driver of the Linux kernel. This flaw manifests specifically when the __getname() function allocates memory buffers that are subsequently passed to the 'de' parameter without proper initialization. The issue was discovered through systematic analysis using Kernel Memory Sanitizer (KMSAN) which identified potential security implications arising from the use of uninitialized memory regions. The ntfs3 driver, responsible for handling ntfs3 filesystem operations, creates a scenario where memory allocated for name resolution processes contains unpredictable data that could potentially be exploited by malicious actors. This particular vulnerability falls under the category of information disclosure and memory corruption issues that can lead to system instability or privilege escalation.
The technical root cause of this vulnerability stems from improper memory initialization practices within the ntfs3 filesystem implementation. When the __getname() function allocates memory buffers for filesystem name resolution operations, it fails to initialize the allocated memory regions to zero before passing them to the 'de' parameter. This creates a scenario where sensitive data from previous memory operations or uninitialized heap contents may persist in the allocated buffer. The uninitialized buffer can contain arbitrary values that, when processed by the ntfs3 driver, may lead to incorrect behavior or information leakage. The vulnerability specifically impacts the ntfs3 filesystem driver which handles ntfs3 formatted volumes, making it relevant for systems that utilize this filesystem type for data storage or exchange operations.
The operational impact of this vulnerability extends beyond simple memory corruption issues to potentially enable more sophisticated attack vectors. An attacker with access to a system running the affected kernel version could potentially exploit this uninitialized buffer to extract sensitive information from kernel memory spaces, leading to information disclosure vulnerabilities. The memory sanitizer detection method used to identify this flaw indicates that the vulnerability could be leveraged to bypass certain security mitigations or create conditions where memory contents might be interpreted incorrectly. This type of vulnerability can also contribute to system instability, potentially causing kernel panics or denial of service conditions when the uninitialized memory contents are processed by the filesystem driver. The impact is particularly concerning in environments where ntfs3 filesystems are actively used for data exchange or storage operations.
The recommended mitigation strategy involves applying the kernel patch that initializes the allocated buffer with zeros before passing it to the 'de' parameter. This fix directly addresses the root cause by ensuring that all memory allocated by __getname() is properly initialized to prevent information leakage. System administrators should prioritize updating to kernel versions that include this fix, particularly in environments where ntfs3 filesystems are actively utilized. The vulnerability aligns with CWE-457, which describes the use of uninitialized variables, and represents a specific implementation issue within the Linux kernel's filesystem subsystem. Organizations should also consider implementing monitoring for unusual memory access patterns or information disclosure events that might indicate exploitation attempts. Additionally, the fix demonstrates the importance of comprehensive kernel memory validation techniques and the value of automated testing tools like KMSAN in identifying potential security vulnerabilities before they can be exploited in production environments.