CVE-2023-54311

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix deadlock when converting an inline directory in nojournal mode

In no journal mode, ext4_finish_convert_inline_dir() can self-deadlock

by calling ext4_handle_dirty_dirblock() when it already has taken the

directory lock. There is a similar self-deadlock in

ext4_incvert_inline_data_nolock() for data files which we'll fix at

the same time.

A simple reproducer demonstrating the problem:

mke2fs -Fq -t ext2 -O inline_data -b 4k /dev/vdc 64

mount -t ext4 -o dirsync /dev/vdc /vdc

cd /vdc

mkdir file0

cd file0

touch file0

touch file1

attr -s BurnSpaceInEA -V abcde .

touch supercalifragilisticexpialidocious

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References