RHSA-2021:3444: Important: kernel security and bug fix update

Published Sep 7, 2021
·
Updated

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 route4change() in net/sched/clsroute.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)

Affected Software

105 affected componentsFixes available
redhat/kernel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-abi-whitelists<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-cross-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-doc<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-libs<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-cross-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debuginfo-common-s390x<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-zfcpdump-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-cross-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-core<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debug-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-debuginfo-common-ppc64le<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-headers<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-modules-extra<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-libs<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/python3-perf-debuginfo<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/bpftool<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/bpftool-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-core<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-cross-headers<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug-core<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug-devel<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug-modules<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debug-modules-extra<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-debuginfo-common-aarch64<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-devel<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-headers<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-modules<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-modules-extra<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-tools<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-tools-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-tools-libs<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/perf<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/perf-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/python3-perf<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/python3-perf-debuginfo<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa
redhat/kernel-tools-libs-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-libs-devel<4.18.0-147.54.2.el8_1
4.18.0-147.54.2.el8_1
redhat/kernel-tools-libs-devel<4.18.0-147.54.2.el8_1.aa
4.18.0-147.54.2.el8_1.aa

Remediation

Event History

Feb 11, 2026
Advisory Published
via Red Hat·03:06 PM
Data Sourced
via Red Hat·03:06 PM
RemedyDescriptionAffected Software
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Frequently Asked Questions

1

What is the severity of RHSA-2021:3444?

The severity of RHSA-2021:3444 is classified as important.

2

How do I fix RHSA-2021:3444?

To fix RHSA-2021:3444, update your kernel and related packages to version 4.18.0-147.54.2.el8_1 or higher.

3

What vulnerabilities are addressed in RHSA-2021:3444?

RHSA-2021:3444 addresses a race condition in net/can/bcm.c leading to local privilege escalation and a use-after-free vulnerability in route4_change() in net/sched/cls_route.c.

4

Which packages are affected by RHSA-2021:3444?

Packages affected by RHSA-2021:3444 include kernel, bpftool, and kernel-debug among others related to the kernel.

5

Is it necessary to restart after applying the fix for RHSA-2021:3444?

Yes, a system restart is necessary after applying the update related to RHSA-2021:3444 to ensure that the changes take effect.

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