A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 8.4.

[RHSA-2023:3462-01] Important: kernel-rt security and bug fix update

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

Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2023:3462-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2023:3462
Issue date: 2023-06-06
CVE Names: CVE-2022-42896
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.4
Advanced Mission Critical Update Support, Red Hat Enterprise Linux 8.4
Telecommunications Update Service, and Red Hat Enterprise Linux 8.4 Update
Services for SAP Solutions.

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 NFV E4S (v.8.4) - x86_64
Red Hat Enterprise Linux NFV TUS (v.8.4) - x86_64
Red Hat Enterprise Linux RT TUS (v.8.4) - 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 l2cap_connect and l2cap_le_connect_req in
net/bluetooth/l2cap_core.c (CVE-2022-42896)

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 RT source tree to the RHEL-8.4.z17 source tree
(BZ#2185910)

* RHEL-8.7 kernel-rt: INFO: task deadline_test:2526 blocked for more than
600 seconds. (BZ#2188652)

* Crash: kernel BUG at kernel/locking/rtmutex.c:1338! (BZ#2188725)

* kernel-rt: workqueue: Fix divergence from stock 8.4 (BZ#2209152)

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/):

2147364 - CVE-2022-42896 kernel: use-after-free in l2cap_connect and l2cap_le_connect_req in net/bluetooth/l2cap_core.c

6. Package List:

Red Hat Enterprise Linux NFV E4S (v.8.4):

Source:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm

Red Hat Enterprise Linux NFV TUS (v.8.4):

Source:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm

Red Hat Enterprise Linux RT TUS (v.8.4):

Source:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.91.1.rt7.166.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.91.1.rt7.166.el8_4.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-2022-42896
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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