RHSA-2021:5227 — Security Advisory

An update for kernel is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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: In Overlayfs missing a check for a negative dentry before calling vfs_rename() (CVE-2021-20321)

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):

• panic while breaking a lease/delegation after user mode helper invocation (BZ#2010333)

• The ASR driver is causing a system crash in RHEL8.4 compared to RHEL8.3 due to kernel changes (BZ#2016384)

• RHEL8: DFS provided SMB shares are not accessible following unprivileged access (BZ#2017177)

• Avoid hitting the rtnl_trylock/restart_syscall logic in net-sysfs when possible (BZ#2021165)

• RHEL8: x86/Kconfig: Do not enable AMD_MEM_ENCRYPT_ACTIVE_BY_DEFAULT (BZ#2024678)

• RHEL8.4-[Regression][P10][DD2.0][Rainier/Denali] - system crashed while offlining and onlining cores (BZ#2026450)