Addressing a Memory corruption vulnerability in the SMB2 Compound Operation

CVE-2024-46796

What is CVE-2024-46796?

A vulnerability exists in the Linux kernel affecting the SMB client, particularly in how the client manages the reference count of file handles when calling smb2_compound_op() with valid parameters. When an invalid operation results in a failure, the system inadvertently drops references to essential resources. This flaw can trigger memory access violations, leading to potential exploitation through slab-use-after-free errors. Specifically, it manifests when the generic filesystem tests attempt to mount network shares, which intensifies the risk of memory corruption and subsequent exploitation scenarios. This issue has been tracked using KASAN, highlighting the importance of file reference management in secure operations.

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References