A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 8.2.
RHSA-2022:0629-01: Important: kernel-rt security and bug fix update
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
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
CVE Names: CVE-2021-0920 CVE-2021-4028 CVE-2021-4155
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1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2
Extended Update Support.
Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.
2. 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
3. Description:
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 [] handle_userfault+0x530/0x1820 (BZ#2029420)
* kernel-rt: update RT source tree to the latest RHEL-8.2.z15 Batch
(BZ#2046275)
4. 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.
5. Bugs fixed ( https://bugzilla.redhat.com/):
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
6. 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
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-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-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
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/
7. 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
8. Contact:
The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2022 Red Hat, Inc.
