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Red Hat 7:RHSA-2021-4779-02 Important Use-After-Free in Kernel-RT

red hat
Calendar Grey November 23, 2021
Dist Redhat Esm H88
Red Hat releases a new version of kernel-rt for RHEL 7 to tackle critical security vulnerabilities that could affect system stability.
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: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385)
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):
* BUG: scheduling while atomic: bz722926/3905/0x00000002 regresion case with zram (BZ#1833860)
* kernel-rt: update to the latest RHEL7.9.z10 source tree (BZ#2009077)

Topics%20covered

Topics Covered

security advisory Red Hat bug fix security impact kernel-rt use-after-free Real Time Kernel

References

https://access.redhat.com/security/cve/CVE-2020-36385 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-1160.49.1.rt56.1189.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-1160.49.1.rt56.1189.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debug-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-devel-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-kvm-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-trace-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-1160.49.1.rt56.1189.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-1160.49.1.rt56.1189.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-2021:4779-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4779
Issue date: 2021-11-23

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 security impact kernel-rt use-after-free 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

1833860 - BUG: scheduling while atomic: bz722926/3905/0x00000002 regresion case with zram

1974319 - CVE-2020-36385 kernel: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free

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