A flaw in the grub2-set-bootflag utility of grub2 can lead to a denial of service. The issue arises when the program creates a temporary file with new grubenv content and is killed before renaming it to the original grubenv file, resulting in the temporary file not being removed. This can cause the filesystem to fill up with temporary files when the utility is invoked multiple times, leading to a filesystem out of free inodes or blocks. The vulnerability is related to incomplete cleanup of temporary or auxiliary resources.