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Red Hat 7.4 RHSA-2021:3725-01 Important: Kernel Security Fix

red hat
Calendar Grey October 5, 2021
Dist Redhat Esm H88
A critical kernel update for CentOS addressing vulnerabilities and issues. Reboot necessary post-update for changes to take effect.
An update for kernel is now available for Red Hat Enterprise Linux 7.4 Advanced 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: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
* kernel: race condition for removal of the HCI controller (CVE-2021-32399)
* 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):
* [CKI kernel builds]: x86 binaries in non-x86 kernel rpms breaks systemtap [7.9.z] (BZ#1975161)

Topics%20covered

Topics Covered

security advisory security issue bug fix Red Hat Enterprise Linux important kernel system reboot

References

https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-22555 https://access.redhat.com/security/cve/CVE-2021-32399 https://access.redhat.com/security/cve/CVE-2021-37576 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Server AUS (v. 7.4):
Source: kernel-3.10.0-693.94.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-693.94.1.el7.noarch.rpm kernel-doc-3.10.0-693.94.1.el7.noarch.rpm
x86_64: kernel-3.10.0-693.94.1.el7.x86_64.rpm kernel-debug-3.10.0-693.94.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-693.94.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.94.1.el7.x86_64.rpm kernel-devel-3.10.0-693.94.1.el7.x86_64.rpm kernel-headers-3.10.0-693.94.1.el7.x86_64.rpm kernel-tools-3.10.0-693.94.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-693.94.1.el7.x86_64.rpm perf-3.10.0-693.94.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm python-perf-3.10.0-693.94.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.4):
x86_64: kernel-debug-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-693.94.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm kernel-tools-libs-devel-3.10.0-693.94.1.el7.x86_64.rpm perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3725-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3725
Issue date: 2021-10-05

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.4Advanced 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 bug fix Red Hat Enterprise Linux important kernel system reboot

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.4) - noarch, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64

Bugs Fixed

1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks

1970807 - CVE-2021-32399 kernel: race condition for removal of the HCI controller

1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c

1986506 - CVE-2021-37576 kernel: powerpc: KVM guest OS users can cause host OS memory corruption

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