The kernel packages contain the Linux kernel, the core of any Linux
operating system.
This update also fixes the following bugs:
Due to bad memory or memory corruption, an isolated BUG_ON(mm->nr_ptes)
was sometimes reported, indicating that not all the page tables allocated
could be found and freed when the exit_mmap() function cleared the user
address space. As a consequence, a kernel panic occurred. To fix this bug,
the BUG_ON() function has been replaced by WARN_ON(), which prevents the
kernel from panicking in the aforementioned situation. (BZ#1235929)
Previously, it was for the ext4 driver to read a metadata block and use
it without a verification. If the metadata block was corrupted, a kernel
panic could occur. With this update, verification is forced on every buffer
before it is used, which uncovers possible corruption and prevents further
use of the corrupted metadata buffer. (BZ#1242930)
All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.