Race Condition Vulnerability in Linux Kernel f2fs Filesystem by Vendor Linux

CVE-2023-53447

What is CVE-2023-53447?

A vulnerability in the Linux kernel's f2fs filesystem can lead to a race condition when the filesystem is remounted with read-write access. This condition arises as two threads (Thread A and Thread B) simultaneously execute operations that modify the state of the filesystem. While one thread attempts to remount the filesystem, another may call the fallocate operation, leading to potential access of a NULL pointer and causing instability. The issue is triggered by the default mount options being reset, creating a gap where the race condition can exploit timing discrepancies between the operations. This highlights the necessity for close attention to thread synchronization when managing filesystem states.

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