Use-After-Free Vulnerability in f2fs File System on Linux Kernel

CVE-2023-53846

What is CVE-2023-53846?

A use-after-free vulnerability exists in the f2fs file system of the Linux Kernel that could lead to potential out-of-boundary access. Specifically, when inodeA is truncated, it references inodeB, which may cause improper memory access during the truncation process. This flaw can lead to instability and data corruption. A recent patch has been implemented to add a sanity check on the dnode page within the truncate_dnode() function. This enhancement aims to prevent the triggering of the vulnerability, and in case of issues, it records a new error, ERROR_INVALID_NODE_REFERENCE, into the superblock. This will enable filesystem checks (fsck) to detect and attempt repairs for such issues, bolstering the robustness of the f2fs file system.

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