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Alerts This Week
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Red Hat Enterprise Linux 8 RHSA-2021:0003-01 Important Buffer Overflow

red hat
Calendar Grey January 4, 2021
Dist Redhat Esm H88
Keep updated on the critical kernel security patch for CentOS Stream, addressing local memory corruption 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: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c (CVE-2020-25211)
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):
* avoid flush_backlog IPI for isolated CPUs by configuring RPS cpumask (BZ#1883314)
* rngd consumes 100% cpu on rhel-8.3 system in fips mode (BZ#1886192)
* RHEL8.1 - Random memory corruption may occur due to incorrect tlbflush (BZ#1899208)
* fips mode boot is broken after adding extrng (BZ#1899584)
* pmtu of 1280 for vxlan as bridge port won't work (BZ#1902082)
* rpc task loop with kworker spinning at 100% CPU for 10 minutes when umount an NFS 4.x share with sec=krb5 triggered by unmount of the NFS share (BZ#1907667)

Topics%20covered

Topics Covered

security advisory security update Red Hat buffer overflow kernel update bug fix Red Hat Enterprise Linux important kernel system reboot Important local buffer

References

https://access.redhat.com/security/cve/CVE-2020-25211 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: kernel-4.18.0-240.10.1.el8_3.src.rpm
aarch64: bpftool-4.18.0-240.10.1.el8_3.aarch64.rpm bpftool-debuginfo-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-core-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-cross-headers-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-core-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-debuginfo-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-devel-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-modules-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debug-modules-extra-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debuginfo-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-debuginfo-common-aarch64-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-devel-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-headers-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-modules-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-modules-extra-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-tools-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-tools-debuginfo-4.18.0-240.10.1.el8_3.aarch64.rpm kernel-tools-libs-4.18.0-240.10.1.el8_3.aarch64.rpm perf-4.18.0-240.10.1.el8_3.aarch64.rpm perf-debuginfo-4.18.0-240.10.1.el8_3.aarch64.rpm python3-perf-4.18.0-240.10.1.el8_3.aarch64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:0003-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0003
Issue date: 2021-01-04

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 update Red Hat buffer overflow kernel update bug fix Red Hat Enterprise Linux important kernel system reboot Important local buffer

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

1877571 - CVE-2020-25211 kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c

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