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Red Hat: RHSA-2021-2726-01 Important: Kernel-Rt Real-Time Update

red hat
Calendar Grey July 20, 2021
Dist Redhat Esm H88
Red Hat releases a crucial security patch for kernel-rt addressing severe vulnerabilities and software glitches. Discover the implications here.
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: size_t-to-int conversion vulnerability in the filesystem layer (CVE-2021-33909)
* kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)
* kernel: use-after-free in show_numa_stats function (CVE-2019-20934)
* kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c (CVE-2020-11668)
* kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c (CVE-2021-33033)
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.z7 source tree (BZ#1967333)

Topics%20covered

Topics Covered

security advisory Red Hat bug fix important security impact kernel-rt real time kernel

References

https://access.redhat.com/security/cve/CVE-2019-20934 https://access.redhat.com/security/cve/CVE-2020-11668 https://access.redhat.com/security/cve/CVE-2021-33033 https://access.redhat.com/security/cve/CVE-2021-33034 https://access.redhat.com/security/cve/CVE-2021-33909 https://access.redhat.com/security/updates/classification#important https://access.redhat.com/security/vulnerabilities/RHSB-2021-006

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-1160.36.2.rt56.1179.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debug-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-trace-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-1160.36.2.rt56.1179.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-1160.36.2.rt56.1179.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-2021:2726-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2726
Issue date: 2021-07-20

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 Red Hat bug fix important security impact kernel-rt real time kernel

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

1824792 - CVE-2020-11668 kernel: mishandles invalid descriptors in drivers/media/usb/gspca/xirlink_cit.c

1902788 - CVE-2019-20934 kernel: use-after-free in show_numa_stats function

1961300 - CVE-2021-33033 kernel: use-after-free in cipso_v4_genopt in net/ipv4/cipso_ipv4.c

1961305 - CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan

1970273 - CVE-2021-33909 kernel: size_t-to-int conversion vulnerability in the filesystem layer

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