Alerts This Week
Warning Icon 1 692
Alerts This Week
Warning Icon 1 692

Red Hat: RHSA-2021-3440-01 Moderate: kernel-rt Security Fix

red hat
Calendar Grey September 7, 2021
Dist Redhat Esm H88
The kernel-rt update for RHEL 8 presents a medium-level security risk while addressing numerous bugs and providing effective solutions.
An update for kernel-rt 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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201)
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):
* OSLAT spikes on subset of cpus (BZ#1986063)
* kernel-rt: update RT source tree to the RHEL-8.4.z source tree (BZ#1990013)
* Failure to enter full_nohz due to needless SCHED softirqs (BZ#1990272)
* kernel-rt: Make rcu_normal_after_boot writable (BZ#1995431)

Topics%20covered

Topics Covered

security advisory Red Hat moderate severity bug fixes system impact kernel-rt Real Time kernel

References

https://access.redhat.com/security/cve/CVE-2021-38201 https://access.redhat.com/security/updates/classification#moderate

Package List

Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source: kernel-rt-4.18.0-305.17.1.rt7.89.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-kvm-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-kvm-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time (v. 8):
Source: kernel-rt-4.18.0-305.17.1.rt7.89.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.17.1.rt7.89.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3440-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3440
Issue date: 2021-09-07

Topic

An update for kernel-rt 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 Red Hat moderate severity bug fixes system impact kernel-rt Real Time kernel

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time (v. 8) - x86_64

Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64

Bugs Fixed

1992731 - CVE-2021-38201 kernel: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c

Get the latest News and Insights

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

Your message here