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Red Hat Enterprise Linux 8: RHSA-2021-3044-01 Critical Kpatch Update

red hat
Calendar Grey August 10, 2021
Dist Redhat Esm H88
Red Hat announces a significant kpatch-patch upgrade that resolves urgent vulnerabilities. Discover further details regarding the security enhancements.
An update for kpatch-patch 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

Summary

This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
* 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)
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 security update local privilege escalation kernel patch Red Hat Enterprise KVM kpatch

References

https://access.redhat.com/security/cve/CVE-2021-3609 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-22555 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux BaseOS (v. 8):
Source: kpatch-patch-4_18_0-305-1-4.el8.src.rpm kpatch-patch-4_18_0-305_10_2-1-1.el8_4.src.rpm kpatch-patch-4_18_0-305_3_1-1-3.el8_4.src.rpm kpatch-patch-4_18_0-305_7_1-1-2.el8_4.src.rpm
ppc64le: kpatch-patch-4_18_0-305-1-4.el8.ppc64le.rpm kpatch-patch-4_18_0-305-debuginfo-1-4.el8.ppc64le.rpm kpatch-patch-4_18_0-305-debugsource-1-4.el8.ppc64le.rpm kpatch-patch-4_18_0-305_10_2-1-1.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_10_2-debuginfo-1-1.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_10_2-debugsource-1-1.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_3_1-1-3.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_3_1-debuginfo-1-3.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_3_1-debugsource-1-3.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_7_1-1-2.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_7_1-debuginfo-1-2.el8_4.ppc64le.rpm kpatch-patch-4_18_0-305_7_1-debugsource-1-2.el8_4.ppc64le.rpm
x86_64: kpatch-patch-4_18_0-305-1-4.el8.x86_64.rpm kpatch-patch-4_18_0-305-debuginfo-1-4.el8.x86_64.rpm kpatch-patch-4_18_0-305-debugsource-1-4.el8.x86_64.rpm kpatch-patch-4_18_0-305_10_2-1-1.el8_4.x86_64.rpm kpatch-patch-4_18_0-305_10_2-debuginfo-1-1.el8_4.x86_64.rpm kpatch-patch-4_18_0-305_10_2-debugsource-1-1.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3044-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3044
Issue date: 2021-08-10

Topic

An update for kpatch-patch 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 local privilege escalation kernel patch Red Hat Enterprise KVM kpatch

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS (v. 8) - ppc64le, x86_64

Bugs Fixed

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

1971651 - CVE-2021-3609 kernel: race condition in net/can/bcm.c leads to local privilege escalation

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

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