CVE-2024-58008 in Linux
Summary
by MITRE • 02/27/2025
In the Linux kernel, the following vulnerability has been resolved:
KEYS: trusted: dcp: fix improper sg use with CONFIG_VMAP_STACK=y
With vmalloc stack addresses enabled (CONFIG_VMAP_STACK=y) DCP trusted keys can crash during en- and decryption of the blob encryption key via the DCP crypto driver. This is caused by improperly using sg_init_one() with vmalloc'd stack buffers (plain_key_blob).
Fix this by always using kmalloc() for buffers we give to the DCP crypto driver.
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Analysis
by VulDB Data Team • 05/24/2026
The vulnerability CVE-2024-58008 affects the Linux kernel's cryptographic subsystem, specifically within the trusted keys implementation when utilizing the DCP (Data Center Processor) crypto driver. This issue manifests when the kernel is compiled with CONFIG_VMAP_STACK=y, which enables vmalloc-based stack allocation. The flaw occurs during encryption and decryption operations of blob encryption keys, where the system experiences crashes due to improper handling of scatter-gather list operations with virtual memory allocations.
The technical root cause involves the improper use of sg_init_one() function with vmalloc'd stack buffers, specifically the plain_key_blob variable. When vmalloc is used for stack allocation, the memory addresses obtained are virtual addresses that may not be suitable for direct hardware DMA operations required by the DCP crypto driver. This incompatibility between virtual memory management and hardware interface requirements creates a critical failure point during cryptographic operations. The scatter-gather list initialization function expects contiguous physical memory addresses that can be directly accessed by hardware, but vmalloc'd memory may be fragmented or require page table manipulation that the crypto driver cannot handle properly.
The operational impact of this vulnerability is significant as it can lead to system crashes and potential denial of service conditions during critical cryptographic operations. When trusted keys are used for blob encryption key management, any failure during en- and decryption processes can compromise system security and availability. The vulnerability affects systems running Linux kernels with vmalloc stack support enabled, which is commonly found in enterprise and server environments where memory management optimizations are critical. This issue particularly impacts systems relying on DCP crypto drivers for hardware-accelerated cryptographic operations, potentially affecting data protection mechanisms and secure key management workflows.
The fix implemented addresses this vulnerability by ensuring that all buffers provided to the DCP crypto driver are allocated using kmalloc() instead of vmalloc() or stack-based allocation. This change guarantees that memory addresses are suitable for hardware DMA operations and maintain the required physical contiguity for the crypto driver to function correctly. The solution aligns with security best practices for kernel memory management, ensuring that hardware interface requirements are met while maintaining system stability. This mitigation approach follows the principle of least privilege and proper resource allocation, preventing the use of inappropriate memory types for hardware-accelerated operations.
This vulnerability can be categorized under CWE-121 as a stack-based buffer overflow condition, though more specifically it represents improper memory management in kernel space. The issue relates to the ATT&CK technique T1552.001 for Unsecured Credentials and T1059.001 for Command and Scripting Interpreter, as it affects cryptographic key management and can potentially be exploited to compromise system security. The fix demonstrates proper kernel memory management practices and aligns with the principle of using appropriate allocation methods for different memory usage contexts, particularly when interfacing with hardware components that require specific memory characteristics for DMA operations.