Alerts This Week
Warning Icon 1 714
Alerts This Week
Warning Icon 1 714

Red Hat Enterprise Linux 8 RHSA-2021-5227 Moderate: Security Kernel Update

red hat
Calendar Grey December 21, 2021
Dist Redhat Esm H88
Red Hat released a Moderate security enhancement and bug resolution update for the kernel on Red Hat Enterprise Linux 8, impacting performance.
An update for kernel is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Summary

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)

Topics%20covered

Topics Covered

security advisory kernel update bug fix Red Hat Enterprise Linux moderate severity overlayfs issue

References

https://access.redhat.com/security/cve/CVE-2021-20321 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: kernel-4.18.0-348.7.1.el8_5.src.rpm
aarch64: bpftool-4.18.0-348.7.1.el8_5.aarch64.rpm bpftool-debuginfo-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-core-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-cross-headers-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-core-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-debuginfo-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-devel-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-modules-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debug-modules-extra-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debuginfo-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-devel-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-headers-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-modules-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-modules-extra-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-tools-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-tools-debuginfo-4.18.0-348.7.1.el8_5.aarch64.rpm kernel-tools-libs-4.18.0-348.7.1.el8_5.aarch64.rpm perf-4.18.0-348.7.1.el8_5.aarch64.rpm perf-debuginfo-4.18.0-348.7.1.el8_5.aarch64.rpm python3-perf-4.18.0-348.7.1.el8_5.aarch64.rpm

Read the Full Advisory


Advisory ID: RHSA-2021:5227-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:5227
Issue date: 2021-12-21

Topic

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 impactof Moderate. A Common Vulnerability Scoring System (CVSS) base score, whichgives a detailed severity rating, is available for each vulnerability fromthe CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory kernel update bug fix Red Hat Enterprise Linux moderate severity overlayfs issue

Relevant Releases Architectures

Red Hat CodeReady Linux Builder (v. 8) - aarch64, ppc64le, x86_64

Red Hat Enterprise Linux BaseOS (v. 8) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

2013242 - CVE-2021-20321 kernel: In Overlayfs missing a check for a negative dentry before calling vfs_rename()

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.

Your message here