exfat: fix the infinite loop in exfat_readdir()

Summary

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.

Timeline

1. Jan 21, 2025, 12:18 PM UTCCVE published
2. Oct 15, 2026, 1:00 AM UTCRecord last updated

Affected versions

• Linux Linux

  From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in d8cfbb8723bd3d3222f360227a1cc15227189ca6; From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in 28c21f0ac5293a4bf19b3e0e32005d6dd31a6c17; From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in 31beabd0f47f8c3ed9965ba861c9e5b252d4920a; From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in dc1d7afceb982e8f666e70a582e6b5aa806de063; From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in d9ea94f5cd117d56e573696d0045ab3044185a15; From ca06197382bde0a3bc20215595d1c9ce20c6e341 · fixed in fee873761bd978d077d8c55334b4966ac4cb7b59

• Linux Linux

  5.7

• KernelLinux

  From 5.7.0 · fixed in 5.10.234; From 5.11.0 · fixed in 5.15.177; From 5.16.0 · fixed in 6.1.125; From 6.2.0 · fixed in 6.6.72; From 6.7.0 · fixed in 6.12.10

References 6