RHSA-2021:0686: 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: bad kfree in auditfilter.c may lead to escalation of privilege (CVE-2020-0444)
• kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free (CVE-2020-29661)
• kernel: performance counters race condition use-after-free (CVE-2020-14351)
• kernel: ICMP rate limiting can be used for DNS poisoning attack (CVE-2020-25705) 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):
• [Hyper-V][RHEL-8] Request to included a commit that adds a timeout to vmbus_wait_for_unload (BZ#1913530)
• [CKI kernel builds]: x86 binaries in non-x86 kernel rpms breaks systemtap (BZ#1929908)
• rpmbuild cannot build the userspace RPMs in the kernel package when the kernel itself is not built (BZ#1929912) Related CVEs:
• CVE-2020-0444: kernel: bad kfree in auditfilter.c may lead to escalation of privilege
• CVE-2020-14351: kernel: performance counters race condition use-after-free
• CVE-2020-25705: kernel: ICMP rate limiting can be used for DNS poisoning attack
• CVE-2020-29661: kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free