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Red Hat Enterprise Linux 7: RHSA-2021:1070-01 Critical: Kernel-Rt Bug Fix

red hat
Calendar Grey April 6, 2021
Dist Redhat Esm H88
Discover the crucial kernel-rt security and reliability enhancement patch affecting Red Hat Enterprise Linux 7.
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 read in libiscsi module (CVE-2021-27364)
* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)
* kernel: iscsi: unrestricted access to sessions and handles (CVE-2021-27363)
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):
* RHEL7.9 Realtime crashes due to a blocked task detection. The blocked task is stuck in unregister_shrinker() where multiple tasks have taken the shrinker_rwsem and are fighting on a dentry's d_lockref lock rt_mutex. [kernel-rt] (BZ#1935557)
* kernel-rt: update to the latest RHEL7.9.z5 source tree (BZ#1939220)

Topics%20covered

Topics Covered

security advisory critical bug fix kernel security Red Hat Enterprise Linux important heap overflow out-of-bounds read kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-27363 https://access.redhat.com/security/cve/CVE-2021-27364 https://access.redhat.com/security/cve/CVE-2021-27365 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-1160.24.1.rt56.1161.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-1160.24.1.rt56.1161.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debug-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-devel-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-kvm-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-trace-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-1160.24.1.rt56.1161.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-1160.24.1.rt56.1161.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-2021:1070-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:1070
Issue date: 2021-04-06

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 critical bug fix kernel security Red Hat Enterprise Linux important heap overflow out-of-bounds read 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

1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem

1930079 - CVE-2021-27363 kernel: iscsi: unrestricted access to sessions and handles

1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

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