CVE-2021-47406

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue arises when the call to ext4 map blocks() fails due to a corrupted file system, causing ext4 ext replay set iblocks() to get stuck in an infinite loop. This can be reproduced by running generic/526 with a file system that has inline data and fast commit enabled. The system will repeatedly log an EXT4-fs warning to the console, indicating a block greater than the maximum in an inode. The stack trace shows the functions involved, including ext4 block to path(), ext4 ind map blocks(), ext4 map blocks(), and others. The root cause is likely that fast commit replay is corrupting file systems with inline data, and better error handling is needed in the fast commit replay code path.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.