Bug 2333985 (CVE-2024-53147)

Summary: CVE-2024-53147 kernel: exfat: fix out-of-bounds access of directory entries
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2024-12-24 12:02:21 UTC 
In the Linux kernel, the following vulnerability has been resolved:

exfat: fix out-of-bounds access of directory entries

In the case of the directory size is greater than or equal to
the cluster size, if start_clu becomes an EOF cluster(an invalid
cluster) due to file system corruption, then the directory entry
where ei->hint_femp.eidx hint is outside the directory, resulting
in an out-of-bounds access, which may cause further file system
corruption.

This commit adds a check for start_clu, if it is an invalid cluster,
the file or directory will be treated as empty.
Comment 1 Avinash Hanwate 2024-12-24 12:20:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024122426-CVE-2024-53147-bea5@gregkh/T