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RedHat: RHSA-2021-2718-01 Important Kernel Security Update Overview

red hat
Calendar Grey July 20, 2021
Dist Redhat Esm H88
The new Red Hat Enterprise Linux update delivers critical security fixes targeting kernel vulnerabilities, enhancing system integrity against memory corruption and privilege escalation risks
An update for kernel is now available for Red Hat Enterprise Linux 8.2 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: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
* kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
* kernel: perf_event_parse_addr_filter memory (CVE-2020-25704)
* kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)
* kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting - ->real_parent (CVE-2020-35508)
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):
* RHEL8.2 Snapshot2 - tpm: ibmvtpm: Wait for buffer to be set before proceeding (BZ#1933986)
* fnic crash from invalid request pointer (BZ#1961707)
* [Azure][RHEL8.4] Two Patches Needed To Enable Azure Host Time-syncing in VMs (BZ#1963051)
* RHEL kernel 8.2 and higher are affected by data corruption bug in raid1 arrays using bitmaps. (BZ#1969338)

Topics%20covered

Topics Covered

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

References

https://access.redhat.com/security/cve/CVE-2020-25704 https://access.redhat.com/security/cve/CVE-2020-26541 https://access.redhat.com/security/cve/CVE-2020-35508 https://access.redhat.com/security/cve/CVE-2021-33034 https://access.redhat.com/security/cve/CVE-2021-33909 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/RHSB-2021-006

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.2):
Source: kernel-4.18.0-193.60.2.el8_2.src.rpm
aarch64: bpftool-4.18.0-193.60.2.el8_2.aarch64.rpm bpftool-debuginfo-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-core-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-cross-headers-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-core-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-debuginfo-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-devel-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-modules-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debug-modules-extra-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debuginfo-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-devel-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-headers-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-modules-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-modules-extra-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-tools-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-tools-debuginfo-4.18.0-193.60.2.el8_2.aarch64.rpm kernel-tools-libs-4.18.0-193.60.2.el8_2.aarch64.rpm perf-4.18.0-193.60.2.el8_2.aarch64.rpm perf-debuginfo-4.18.0-193.60.2.el8_2.aarch64.rpm python3-perf-4.18.0-193.60.2.el8_2.aarch64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2718-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2718
Issue date: 2021-07-20

Topic

An update for kernel is now available for Red Hat Enterprise Linux 8.2Extended 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 Red Hat critical bug fix kernel security impact important update

Relevant Releases Architectures

Red Hat CodeReady Linux Builder EUS (v. 8.2) - aarch64, ppc64le, x86_64

Red Hat Enterprise Linux BaseOS EUS (v. 8.2) - aarch64, noarch, ppc64le, s390x, x86_64

Bugs Fixed

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

1895961 - CVE-2020-25704 kernel: perf_event_parse_addr_filter memory

1902724 - CVE-2020-35508 kernel: fork: fix copy_process(CLONE_PARENT) race with the exiting ->real_parent

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

1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the filesystem layer

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