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Ubuntu: USN-5000-1 Critical Linux Kernel Security Patch

red hat
Calendar Grey July 7, 2021
Dist Redhat Esm H88
Essential core update for Red Hat Enterprise Linux 8.1 targeting significant vulnerabilities and errors.
An update for kernel is now available for Red Hat Enterprise Linux 8.1 Extended Update Support

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: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
* kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)
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):
* [Azure][RHEL8.4] Two Patches Needed To Enable Azure Host Time-syncing in VMs (BZ#1963052)

Topics%20covered

Topics Covered

security advisory security issue Red Hat kernel update bug fix important security impact

References

https://access.redhat.com/security/cve/CVE-2020-26541 https://access.redhat.com/security/cve/CVE-2021-33034 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.1):
Source: kernel-4.18.0-147.51.1.el8_1.src.rpm
aarch64: bpftool-4.18.0-147.51.1.el8_1.aarch64.rpm bpftool-debuginfo-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-core-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-cross-headers-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-core-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-debuginfo-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-devel-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-modules-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debug-modules-extra-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debuginfo-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-devel-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-headers-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-modules-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-modules-extra-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-tools-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-tools-debuginfo-4.18.0-147.51.1.el8_1.aarch64.rpm kernel-tools-libs-4.18.0-147.51.1.el8_1.aarch64.rpm perf-4.18.0-147.51.1.el8_1.aarch64.rpm perf-debuginfo-4.18.0-147.51.1.el8_1.aarch64.rpm python3-perf-4.18.0-147.51.1.el8_1.aarch64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2666-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2666
Issue date: 2021-07-07

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.1Extended Update Support.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory security issue Red Hat kernel update bug fix important security impact

Relevant Releases Architectures

Red Hat CodeReady Linux Builder EUS (v. 8.1) - aarch64, ppc64le, x86_64

Red Hat Enterprise Linux BaseOS EUS (v. 8.1) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

1886285 - CVE-2020-26541 kernel: security bypass in certs/blacklist.c and certs/system_keyring.c

1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan

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