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Red Hat 7 Kernel-rt Important Update RHSA-2021:3328-01 CVE-2021-22555 DoS

red hat
Calendar Grey August 31, 2021
Dist Redhat Esm H88
The kernel-rt patch for RHEL 7 resolves critical vulnerabilities and incorporates numerous bug corrections. For more information, consult the full report.
An update for kernel-rt is now available for Red Hat Enterprise Linux 7

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-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* 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: Local privilege escalation due to incorrect BPF JIT branch displacement computation (CVE-2021-29154)
* kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS (CVE-2021-29650)
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):
* kernel-rt: update to the latest RHEL7.9.z8 source tree (BZ#1982927)

Topics%20covered

Topics Covered

security advisory privilege escalation important doS red hat enterprise linux out-of-bounds kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-22555 https://access.redhat.com/security/cve/CVE-2021-29154 https://access.redhat.com/security/cve/CVE-2021-29650 https://access.redhat.com/security/cve/CVE-2021-32399 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-1160.41.1.rt56.1181.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-trace-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 7):
Source:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3328-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3328
Issue date: 2021-08-31

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.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 privilege escalation important doS red hat enterprise linux out-of-bounds kernel-rt

Relevant Releases Architectures

Red Hat Enterprise Linux for Real Time (v. 7) - noarch, x86_64

Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

Bugs Fixed

1945388 - CVE-2021-29650 kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS

1946684 - CVE-2021-29154 kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation

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

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