(RHSA-2020:0103) 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 in __blk_drain_queue() function in block/blk-core.c (CVE-2018-20856)

• Kernel: KVM: potential use-after-free via kvm_ioctl_create_device() (CVE-2019-6974)

• kernel: kvm: guest userspace to guest kernel write (CVE-2018-10853)

• kernel: TLB flush happens too late on mremap (CVE-2018-18281)

• kernel: fix race condition between mmget_not_zero()/get_task_mm() and core dumping (CVE-2019-11599)

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

Bug Fix(es):

• guest softlockup in mem_cgroup_reparent_charges with 800GB guests (BZ#1770111)

• [RHEL7.7] Refined TSC clocksource calibration occasionally fails on some SkyLake-X servers (BZ#1775682)