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Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2023:0854-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:0854
Issue date:        2023-02-21
CVE Names:         CVE-2022-2873 CVE-2022-41222 CVE-2022-43945
====================================================================
1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.

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 for NFV (v. 8) - x86_64
Red Hat Enterprise Linux for Real Time (v. 8) - 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: mm/mremap.c use-after-free vulnerability (CVE-2022-41222)

* kernel: nfsd buffer overflow by RPC message over TCP with garbage data
(CVE-2022-43945)

* kernel: an out-of-bounds vulnerability in i2c-ismt driver (CVE-2022-2873)

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):

* RHEL8-RT: Backport use of a dedicate thread for timer wakeups
(BZ#2127204)

* SNO Crashed twice - kernel BUG at lib/list_debug.c:28 (BZ#2132062)

* Cannot trigger kernel dump using NMI on SNO node running PAO and RT
kernel  [RT-8] (BZ#2139851)

* scheduling while atomic in fpu_clone() -> fpu_inherit_perms()
(BZ#2154469)

* The latest RHEL 8.7.z2 kernel changes need to be merged into the RT
source tree to keep source parity between the two kernels. (BZ#2159806)

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/):

2119048 - CVE-2022-2873 kernel: an out-of-bounds vulnerability in i2c-ismt driver
2138818 - CVE-2022-41222 kernel: mm/mremap.c use-after-free vulnerability
2141752 - CVE-2022-43945 kernel: nfsd buffer overflow by RPC message over TCP with garbage data

6. Package List:

Red Hat Enterprise Linux Real Time for NFV (v. 8):

Source:
kernel-rt-4.18.0-425.13.1.rt7.223.el8_7.src.rpm

x86_64:
kernel-rt-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-kvm-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm

Red Hat Enterprise Linux for Real Time (v. 8):

Source:
kernel-rt-4.18.0-425.13.1.rt7.223.el8_7.src.rpm

x86_64:
kernel-rt-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.13.1.rt7.223.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.13.1.rt7.223.el8_7.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-2022-2873
https://access.redhat.com/security/cve/CVE-2022-41222
https://access.redhat.com/security/cve/CVE-2022-43945
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 2023 Red Hat, Inc.
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