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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2022:0622-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2022:0622
Issue date:        2022-02-22
CVE Names:         CVE-2020-0465 CVE-2020-0466 CVE-2021-0920 
                   CVE-2021-3564 CVE-2021-3573 CVE-2021-3752 
                   CVE-2021-4155 CVE-2022-0330 CVE-2022-22942 
=====================================================================

1. Summary:

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 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 for Real Time (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, 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 eventpoll.c may lead to escalation of privilege
(CVE-2020-0466)

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

* kernel: xfs: raw block device data leak in XFS_IOC_ALLOCSP IOCTL
(CVE-2021-4155)

* kernel: possible privileges escalation due to missing TLB flush
(CVE-2022-0330)

* kernel: failing usercopy allows for use-after-free exploitation
(CVE-2022-22942)

* kernel: out of bounds write in hid-multitouch.c may lead to escalation of
privilege (CVE-2020-0465)

* kernel: double free in bluetooth subsystem when the HCI device
initialization fails (CVE-2021-3564)

* kernel: use-after-free in function hci_sock_bound_ioctl() (CVE-2021-3573)

* kernel: possible use-after-free in bluetooth module (CVE-2021-3752)

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):

* kernel-rt: update to the latest RHEL7.9.z12 source tree (BZ#2039101)

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/):

1920471 - CVE-2020-0465 kernel: out of bounds write in hid-multitouch.c may lead to escalation of privilege
1920480 - CVE-2020-0466 kernel: use after free in eventpoll.c may lead to escalation of privilege
1964139 - CVE-2021-3564 kernel: double free in bluetooth subsystem when the HCI device initialization fails
1966578 - CVE-2021-3573 kernel: use-after-free in function hci_sock_bound_ioctl()
1999544 - CVE-2021-3752 kernel: possible use-after-free in bluetooth module
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
2042404 - CVE-2022-0330 kernel: possible privileges escalation due to missing TLB  flush
2044809 - CVE-2022-22942 kernel: failing usercopy allows for use-after-free exploitation

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-1160.59.1.rt56.1200.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.59.1.rt56.1200.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm

Red Hat Enterprise Linux for Real Time (v. 7):

Source:
kernel-rt-3.10.0-1160.59.1.rt56.1200.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.59.1.rt56.1200.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.59.1.rt56.1200.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.59.1.rt56.1200.el7.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-2020-0465
https://access.redhat.com/security/cve/CVE-2020-0466
https://access.redhat.com/security/cve/CVE-2021-0920
https://access.redhat.com/security/cve/CVE-2021-3564
https://access.redhat.com/security/cve/CVE-2021-3573
https://access.redhat.com/security/cve/CVE-2021-3752
https://access.redhat.com/security/cve/CVE-2021-4155
https://access.redhat.com/security/cve/CVE-2022-0330
https://access.redhat.com/security/cve/CVE-2022-22942
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2022 Red Hat, Inc.
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