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Red Hat 8.2 RHSA-2021-3445 Important: Kernel-RT Buffer Overflow Fix

red hat
Calendar Grey September 7, 2021
Dist Redhat Esm H88
The kernel-rt patch for Red Hat 8.2 addresses critical vulnerabilities and defects, such as stack overflow and improper memory handling.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Extended Update Support

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 due to a heap buffer overflow in __hidinput_change_resolution_multipliers() of hid-input.c (CVE-2021-0512)
* kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)
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):
* OSLAT spikes on subset of cpus (BZ#1986064)
* Failure to enter full_nohz due to needless SCHED softirqs (BZ#1990273)
* kernel-rt: update RT source tree to the latest RHEL-8.2.z12 Batch source tree (BZ#1997761)

Topics%20covered

Topics Covered

security advisory Red Hat update buffer overflow kernel-rt real-time kernel severity important

References

https://access.redhat.com/security/cve/CVE-2021-0512 https://access.redhat.com/security/cve/CVE-2021-3715 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.65.2.rt13.117.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-core-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-devel-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-kvm-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-modules-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debuginfo-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-devel-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-kvm-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-modules-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-modules-extra-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.65.2.rt13.117.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.65.2.rt13.117.el8_2.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3445-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3445
Issue date: 2021-09-07

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Extended Update Support.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 update buffer overflow kernel-rt real-time kernel severity important

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time EUS (v. 8.2) - x86_64

Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) - x86_64

Bugs Fixed

1974491 - CVE-2021-0512 kernel: out-of-bounds write due to a heap buffer overflow in __hidinput_change_resolution_multipliers() of hid-input.c

1993988 - CVE-2021-3715 kernel: use-after-free in route4_change() in net/sched/cls_route.c

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