CVE-2023-53055 Information

Description

In the Linux kernel the following vulnerability has been resolved:

fscrypt: destroy keyring after security_sb_delete()

fscrypt_destroy_keyring() must be called after all potentially-encrypted inodes were evicted; otherwise it cannot safely destroy the keyring. Since inodes that are in-use by the Landlock LSM don’t get evicted until security_sb_delete() this means that fscrypt_destroy_keyring() must be called after security_sb_delete().

This fixes a WARN_ON followed by a NULL dereference only possible if Landlock was being used on encrypted files.

Reference

https://git.kernel.org/stable/c/497ab5d9c7852dfedab2c9de75e41b60e54b7c5d https://git.kernel.org/stable/c/992a3f3e8a0c92151dfdf65fc85567c865fd558a https://git.kernel.org/stable/c/ccb820dc7d2236b1af0d54ae038a27b5b6d5ae5a https://git.kernel.org/stable/c/d77531fac6a1fd9f1db0195438ba5419d72b96c4