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             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.5846
     [RHSA-2023:5588] Important: kernel-rt security and bug fix update
                              11 October 2023

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel-rt
Publisher:         Red Hat
Operating System:  Red Hat
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-4128 CVE-2022-42896 

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2023:5588

Comment: CVSS (Max):  8.1 CVE-2022-42896 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N)
         CVSS Source: Red Hat
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2023:5588
Product:           Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:5588
Issue date:        2023-10-10
CVE Names:         CVE-2022-42896 CVE-2023-4128
=====================================================================

1. Summary:

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2
Telecommunications Update Service.

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 TUS (v. 8.2) - x86_64 
Red Hat Enterprise Linux Real Time TUS (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 l2cap_connect and l2cap_le_connect_req in
net/bluetooth/l2cap_core.c (CVE-2022-42896)

* kernel: net/sched: Use-after-free vulnerabilities in the net/sched
classifiers: cls_fw, cls_u32 and cls_route (CVE-2023-4128)

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-8.2.z29 source tree (BZ#2232651)

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 - use-after-free in l2cap_connect and
l2cap_le_connect_req in net/bluetooth/l2cap_core.c
2225511 - CVE-2023-4128 - cls_fw, cls_u32 and cls_route 

6. Package List:

Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)

Source:
kernel-rt-0:4.18.0-193.116.1.rt13.167.el8_2.src.rpm

x86_64:
kernel-rt-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-core-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-core-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-devel-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-kvm-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-modules-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debuginfo-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-devel-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-kvm-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-modules-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-modules-extra-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm

Red Hat Enterprise Linux Real Time TUS (v. 8.2)

Source:
kernel-rt-0:4.18.0-193.116.1.rt13.167.el8_2.src.rpm

x86_64:
kernel-rt-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-core-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-core-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-devel-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-modules-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debuginfo-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-devel-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-modules-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm
kernel-rt-modules-extra-0:4.18.0-193.116.1.rt13.167.el8_2.x86_64.rpm

7. References:

https://www.cve.org/CVERecord?id=CVE-2022-42896
https://www.cve.org/CVERecord?id=CVE-2023-4128
https://access.redhat.com/security/updates/classification/#important

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