CVE-2025-40052

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The Linux kernel contains an issue within the SMB client related to cryptographic buffers in non-linear memory. The crypto API, specifically through the scatterlist API, requires input buffers to be in linear memory. The issue arises when allocating an AEAD request buffer using kvzalloc(), which can place the buffer in vmalloc space. This can lead to a kernel bug when handling tasks with stacks in vmalloc areas, potentially triggered by numerous parallel read and write operations on an encrypted mount. The root cause is the use of vmalloc'd memory with the scatterlist API, which expects linear memory.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.