CVE-2025-38317 in Linux
Summary
by MITRE • 07/10/2025
In the Linux kernel, the following vulnerability has been resolved:
wifi: ath12k: Fix buffer overflow in debugfs
If the user tries to write more than 32 bytes then it results in memory corruption. Fortunately, this is debugfs so it's limited to root users.
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Analysis
by VulDB Data Team • 12/07/2025
The vulnerability CVE-2025-38317 represents a critical buffer overflow flaw within the ath12k wireless driver component of the Linux kernel ecosystem. This issue specifically affects the debugfs interface implementation in the ath12k driver which manages Qualcomm's 12k family of wireless networking chips. The flaw manifests when user-space applications attempt to write data exceeding 32 bytes into a designated debugfs file, creating a classic buffer overrun condition that can lead to arbitrary memory corruption. The vulnerability is particularly concerning as it exists within the kernel space where such issues can potentially escalate to system-wide compromise.
The technical implementation of this vulnerability stems from inadequate input validation within the debugfs file operations of the ath12k driver. When a user writes data to the debugfs interface, the driver fails to properly enforce bounds checking on the input size, allowing data to overflow into adjacent memory regions. This buffer overflow condition directly maps to CWE-121, which describes stack-based buffer overflow vulnerabilities, and CWE-122, which covers heap-based buffer overflow scenarios. The flaw operates at the kernel level where memory corruption can result in unpredictable behavior including system crashes, data corruption, or potentially privilege escalation. The debugfs interface typically provides diagnostic information and configuration parameters to kernel developers and system administrators, making it a critical attack surface when not properly secured against malformed input.
The operational impact of this vulnerability is significant despite its limited attack surface, as debugfs interfaces are accessible to root users only. However, the potential for exploitation remains high since any root user or application running with elevated privileges could trigger the buffer overflow condition. The memory corruption resulting from this overflow could lead to system instability, denial of service conditions, or in more sophisticated attack scenarios, provide a foothold for privilege escalation. From an attack perspective, this vulnerability aligns with ATT&CK technique T1068, which covers 'Exploitation for Privilege Escalation', and T1059, covering 'Command and Scripting Interpreter', as attackers could leverage the corrupted memory to execute malicious code. The vulnerability represents a classic example of how kernel-level buffer overflows can provide attackers with opportunities to compromise system integrity.
Mitigation strategies for CVE-2025-38317 should focus on both immediate patch application and operational security measures. The primary remediation involves applying the kernel patch that implements proper bounds checking for debugfs write operations, ensuring that input data cannot exceed the allocated buffer size of 32 bytes. System administrators should also implement strict access controls on debugfs interfaces, limiting root user access where possible and monitoring for unusual write operations to these interfaces. Security monitoring should include detection of large write operations to debugfs files, which could indicate exploitation attempts. Additionally, organizations should conduct regular vulnerability assessments of their kernel configurations and ensure that debugfs interfaces are properly secured in production environments. The fix addresses the immediate technical flaw while maintaining the driver's diagnostic capabilities for legitimate system administration purposes.