CVE-2024-57940 Information

Description

In the Linux kernel the following vulnerability has been resolved:

exfat: fix the infinite loop in exfat_readdir()

If the file system is corrupted so that a cluster is linked to itself in the cluster chain and there is an unused directory entry in the cluster ‘dentry’ will not be incremented causing condition ‘dentry < max_dentries’ unable to prevent an infinite loop.

This infinite loop causes s_lock not to be released and other tasks will hang such as exfat_sync_fs().

This commit stops traversing the cluster chain when there is unused directory entry in the cluster to avoid this infinite loop.

Reference

https://git.kernel.org/stable/c/31beabd0f47f8c3ed9965ba861c9e5b252d4920a https://git.kernel.org/stable/c/d9ea94f5cd117d56e573696d0045ab3044185a15 https://git.kernel.org/stable/c/dc1d7afceb982e8f666e70a582e6b5aa806de063 https://git.kernel.org/stable/c/fee873761bd978d077d8c55334b4966ac4cb7b59