(RHSA-2018:3822) Important: kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

• kernel: Use-after-free vulnerability in DCCP socket (CVE-2017-8824)

• kernel: Use-after-free in sys_mq_notify() (CVE-2017-11176)

• kernel: Use-after-free in snd_seq_ioctl_create_port() (CVE-2017-15265)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Red Hat would like to thank Mohamed Ghannam for reporting CVE-2017-8824.

Bug Fix(es):

• Previously, on certain Intel 64 systems, the microcode contained a new model-specific register (MSR) that was not present in the older microcode running on CPUs that had not been updated yet. As a consequence, the system crashed due to a general protection fault on a CPU running the older microcode. This update fixes the bug by having the kernel use MSR access routines that handle the general protection fault. As a result, the system no longer crashes in the described scenario. (BZ#1651481)