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Red Hat: RHSA-2022:0629-01 Critical: kernel-rt Privilege Escalation

red hat
Calendar Grey February 22, 2022
Dist Redhat Esm H88
A significant announcement regarding kernel-rt for Red Hat Enterprise Linux tackles vital security vulnerabilities and various system bugs.
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: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)
* kernel: use-after-free in RDMA listen() (CVE-2021-4028)
* kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL (CVE-2021-4155)
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):
* kernnel-rt-debug: do not call blocking ops when !TASK_RUNNING; state=1 set at [<0000000050e86018>] handle_userfault+0x530/0x1820 (BZ#2029420)
* kernel-rt: update RT source tree to the latest RHEL-8.2.z15 Batch (BZ#2046275)

Topics%20covered

Topics Covered

security advisory security issue critical threat Red Hat Enterprise kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-0920 https://access.redhat.com/security/cve/CVE-2021-4028 https://access.redhat.com/security/cve/CVE-2021-4155 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-4.18.0-193.75.1.rt13.125.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-core-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-devel-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-kvm-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-modules-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debuginfo-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-devel-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-kvm-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-modules-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-modules-extra-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.75.1.rt13.125.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.75.1.rt13.125.el8_2.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2022:0629-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2022:0629
Issue date: 2022-02-22

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 security issue critical threat Red Hat Enterprise kernel-rt

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

2027201 - CVE-2021-4028 kernel: use-after-free in RDMA listen()

2031930 - CVE-2021-0920 kernel: Use After Free in unix_gc() which could result in a local privilege escalation

2034813 - CVE-2021-4155 kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL

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