RHSA-2021:3444: Red Hat Security Advisory: kernel security and bug fix update

An update for kernel is now available for Red Hat Enterprise Linux 8.1 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.The kernel packages contain the Linux kernel, the core of any Linux operating system. Security Fix(es):

• kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
• kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)
• kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576) 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 kernel call trace when boot up with 4T memory and 2 vcpus (BZ#1993551) Related CVEs:
• CVE-2021-3609: kernel: race condition in net/can/bcm.c leads to local privilege escalation
• CVE-2021-3715: kernel: use-after-free in route4_change() in net/sched/cls_route.c
• CVE-2021-37576: kernel: powerpc: KVM guest OS users can cause host OS memory corruption