CVE-2024-38619 in Linux
Summary
by MITRE • 06/20/2024
In the Linux kernel, the following vulnerability has been resolved:
usb-storage: alauda: Check whether the media is initialized
The member "uzonesize" of struct alauda_info will remain 0 if alauda_init_media() fails, potentially causing divide errors in alauda_read_data() and alauda_write_lba(). - Add a member "media_initialized" to struct alauda_info. - Change a condition in alauda_check_media() to ensure the first initialization. - Add an error check for the return value of alauda_init_media().
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Analysis
by VulDB Data Team • 10/05/2025
The vulnerability identified as CVE-2024-38619 resides within the Linux kernel's usb-storage subsystem, specifically affecting the alauda driver implementation. This issue represents a classic case of uninitialized variable handling that can lead to critical system instability. The alauda driver is responsible for managing certain types of USB storage devices, particularly those from specific manufacturers that utilize this proprietary storage protocol implementation. The vulnerability stems from inadequate validation of media initialization states before proceeding with data operations, creating a scenario where critical device parameters remain in an uninitialized state.
The technical flaw manifests through improper state management within the alauda storage driver where the uzonesize member of the alauda_info structure can remain set to zero when media initialization fails. This occurs during the alauda_init_media() function execution, which is responsible for establishing the proper media parameters before allowing data access operations. When this initialization function fails, the uzonesize field retains its default zero value instead of being properly set or indicating an error condition. The absence of proper error handling creates a dangerous condition where subsequent operations attempt to perform mathematical calculations using this zero value, leading to divide-by-zero errors that can crash the kernel or cause system instability.
The operational impact of this vulnerability extends beyond simple system crashes, as it represents a potential denial-of-service condition that could affect any system running the affected Linux kernel version with USB storage devices. The divide errors in alauda_read_data() and alauda_write_lba() functions can trigger kernel oops conditions or system panics, potentially affecting the entire system stability. This vulnerability directly maps to CWE-470: Use of Externally Controlled Input to Select Classes or Code and CWE-369: Divide by Zero, both of which are fundamental security weaknesses that can be exploited to cause system instability. The vulnerability affects the ATT&CK technique T1490: Inhibit System Recovery, as system crashes can prevent normal recovery procedures from completing successfully.
The fix implemented addresses this vulnerability by introducing proper state tracking through the addition of a media_initialized member to the alauda_info structure, ensuring that the driver can properly track whether media initialization has been successfully completed. The solution modifies the alauda_check_media() function to establish proper initialization conditions and adds explicit error checking for alauda_init_media() return values. This approach aligns with security best practices for resource management and error handling, following the principle of least privilege and defensive programming techniques. The mitigation strategy ensures that all data operations are only permitted after successful media initialization, preventing the mathematical operations that lead to divide-by-zero conditions. This fix represents a standard approach to preventing uninitialized variable usage patterns that could otherwise lead to system instability or potential exploitation scenarios.