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Red Hat: RHSA-2021-2570-01 Important: Kernel Security and Bug Fix Update

red hat
Calendar Grey June 29, 2021
Dist Redhat Esm H88
A critical kernel security and bug resolution patch is now out for Red Hat Enterprise Linux 8, addressing significant vulnerabilities.
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: 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):
* [ESXi][RHEL-8] VMXNET3 v4 causes invalid checksums of inner packets of VXLAN tunnel (BZ#1960702)
* fnic crash from invalid request pointer (BZ#1961705)
* GFS2: Failed FS thaw call makes the entire snapshot failed. (BZ#1961849)
* dm writecache: fix performance degradation in ssd mode (BZ#1962241)
* Kernel BUG with act_ct and IP fragments (BZ#1963940)
* core: backports from upstream (BZ#1963952)
* Hibernate resume on RHEL fails in Amazon EC2 C5.18xlarge instance (BZ#1964930)
* [SanityOnly] panic caused by i40e_msix_clean_rings (BZ#1964962)
* tc reclassification limit is too low for OVN (BZ#1965148)
* tc action ct nat src addr does not work while used with ct nat dst addr together (BZ#1965150)
* CNB: Rebase/update TC subsystem for RHEL 8.5 (BZ#1965457)
* sctp: crash due to use after free of sctp_transport structure (BZ#1965632)

Topics%20covered

Topics Covered

security advisory security issue Red Hat bug fix kernel impact Important

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 (v. 8):
Source: kernel-4.18.0-305.7.1.el8_4.src.rpm
aarch64: bpftool-4.18.0-305.7.1.el8_4.aarch64.rpm bpftool-debuginfo-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-core-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-cross-headers-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-core-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-debuginfo-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-devel-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-modules-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debug-modules-extra-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debuginfo-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-devel-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-headers-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-modules-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-modules-extra-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-tools-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-tools-debuginfo-4.18.0-305.7.1.el8_4.aarch64.rpm kernel-tools-libs-4.18.0-305.7.1.el8_4.aarch64.rpm perf-4.18.0-305.7.1.el8_4.aarch64.rpm perf-debuginfo-4.18.0-305.7.1.el8_4.aarch64.rpm python3-perf-4.18.0-305.7.1.el8_4.aarch64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2570-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2570
Issue date: 2021-06-29

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 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 bug fix kernel impact Important

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

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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