CVE-2021-47119

Summary

CVE-2021-47119 is a vulnerability affecting the Linux kernel that has been addressed. The issue lies in the ext4 file system where the function ext4_fill_super fails to release buffer head references before calling kill_bdev. This results in memory leaks, amplified by systemd's creation of cgroups for mounted file systems. The memory consumption becomes noticeable when an infinite loop of starting and stopping a specific ext4 file system mounted on LVM is executed. This can lead to significant memory usage and potential system instability. The vulnerability is resolved by properly freeing the superblock page and buffer head before killing the device.

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