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Red Hat 7.6: RHSA-2021-3812 Important Kernel Security Update

red hat
Calendar Grey October 12, 2021
Dist Redhat Esm H88
Critical kernel patch released for Red Hat Enterprise Linux 7.6, addressing key security flaws and necessitating a system restart.
An update for kernel is now available for Red Hat Enterprise Linux 7.6 Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended Update Support, and Red Hat Enterprise L...

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: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
* kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)
* kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656)
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.

Topics%20covered

Topics Covered

security advisory memory corruption kernel security Red Hat Enterprise Linux important update KVM issue this security impact

References

https://access.redhat.com/security/cve/CVE-2021-3653 https://access.redhat.com/security/cve/CVE-2021-3656 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-2021-37576 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Server AUS (v. 7.6):
Source: kernel-3.10.0-957.84.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-957.84.1.el7.noarch.rpm kernel-doc-3.10.0-957.84.1.el7.noarch.rpm
x86_64: bpftool-3.10.0-957.84.1.el7.x86_64.rpm kernel-3.10.0-957.84.1.el7.x86_64.rpm kernel-debug-3.10.0-957.84.1.el7.x86_64.rpm kernel-debug-debuginfo-3.10.0-957.84.1.el7.x86_64.rpm kernel-debug-devel-3.10.0-957.84.1.el7.x86_64.rpm kernel-debuginfo-3.10.0-957.84.1.el7.x86_64.rpm kernel-debuginfo-common-x86_64-3.10.0-957.84.1.el7.x86_64.rpm kernel-devel-3.10.0-957.84.1.el7.x86_64.rpm kernel-headers-3.10.0-957.84.1.el7.x86_64.rpm kernel-tools-3.10.0-957.84.1.el7.x86_64.rpm kernel-tools-debuginfo-3.10.0-957.84.1.el7.x86_64.rpm kernel-tools-libs-3.10.0-957.84.1.el7.x86_64.rpm perf-3.10.0-957.84.1.el7.x86_64.rpm perf-debuginfo-3.10.0-957.84.1.el7.x86_64.rpm python-perf-3.10.0-957.84.1.el7.x86_64.rpm python-perf-debuginfo-3.10.0-957.84.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server E4S (v. 7.6):
Source: kernel-3.10.0-957.84.1.el7.src.rpm
noarch: kernel-abi-whitelists-3.10.0-957.84.1.el7.noarch.rpm kernel-doc-3.10.0-957.84.1.el7.noarch.rpm
ppc64le: kernel-3.10.0-957.84.1.el7.ppc64le.rpm kernel-bootwrapper-3.10.0-957.84.1.el7.ppc64le.rpm kernel-debug-3.10.0-957.84.1.el7.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3812-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3812
Issue date: 2021-10-12

Topic

An update for kernel is now available for Red Hat Enterprise Linux 7.6Advanced Update Support, Red Hat Enterprise Linux 7.6 Telco Extended UpdateSupport, and Red Hat Enterprise Linux 7.6 Update Services for SAPSolutions.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 memory corruption kernel security Red Hat Enterprise Linux important update KVM issue this security impact

Relevant Releases Architectures

Red Hat Enterprise Linux Server AUS (v. 7.6) - noarch, x86_64

Red Hat Enterprise Linux Server E4S (v. 7.6) - noarch, ppc64le, x86_64

Red Hat Enterprise Linux Server Optional AUS (v. 7.6) - x86_64

Red Hat Enterprise Linux Server Optional E4S (v. 7.6) - ppc64le, x86_64

Red Hat Enterprise Linux Server Optional TUS (v. 7.6) - x86_64

Red Hat Enterprise Linux Server TUS (v. 7.6) - noarch, x86_64

Bugs Fixed

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

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

1983686 - CVE-2021-3653 kernel: SVM nested virtualization issue in KVM (AVIC support)

1983988 - CVE-2021-3656 kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE)

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

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