In the Linux kernel, the following vulnerability has been resolved: ext4: remove a BUGON in ext4mbreleasegrouppa() If a malicious fuzzer overwrites the ext4 superblock while it is mounted such that the sfirstdatablock is set to a very large number, the calculation of the block group can underflow, and trigger a BUGON check. Change this to be an ext4warning so that we don't crash the kernel.