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             AUSCERT External Security Bulletin Redistribution

                               ESB-2023.6926
                         kernel-rt security update
                             22 November 2023

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

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

Product:           kernel-rt
Publisher:         Red Hat
Operating System:  Red Hat
Resolution:        Patch/Upgrade
CVE Names:         CVE-2023-4004 CVE-2023-3776 CVE-2023-3609
                   CVE-2023-1829  

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2023:7431

Comment: CVSS (Max):  7.8 CVE-2023-4004 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
         CVSS Source: Red Hat
         Calculator:  https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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

Synopsis:          Important: kernel-rt security update
Advisory ID:       RHSA-2023:7431
Product:           Red Hat Enterprise Linux Real Time for NFV TUS (v. 8.2)
Advisory URL:      https://access.redhat.com/errata/RHSA-2023:7431
Issue date:        2023-11-21
CVE Names:         CVE-2023-1829 CVE-2023-3609 CVE-2023-3776 CVE-2023-4004
=====================================================================

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 vulnerability in the Linux Kernel traffic control index
filter (CVE-2023-1829)

* kernel: net/sched: cls_u32 component reference counter leak if
tcf_change_indev() fails (CVE-2023-3609)

* kernel: net/sched: cls_fw component can be exploited as result of failure in
tcf_change_indev function (CVE-2023-3776)

* kernel: netfilter: use-after-free due to improper element removal in
nft_pipapo_remove() (CVE-2023-4004)

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.

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/):

2188470 - CVE-2023-1829 - kernel: Use-after-free vulnerability in the Linux
Kernel traffic control index filter
2225201 - CVE-2023-3609 - kernel: net/sched: cls_u32 component reference counter
leak if tcf_change_indev() fails
2225097 - CVE-2023-3776 - kernel: net/sched: cls_fw component can be exploited
as result of failure in tcf_change_indev function
2225275 - CVE-2023-4004 - kernel: netfilter: use-after-free due to improper
element removal in nft_pipapo_remove()

6. Package List:

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

Source:
kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.src.rpm

x86_64:
kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm

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

Source:
kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.src.rpm

x86_64:
kernel-rt-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-core-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debuginfo-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-devel-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-kvm-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-modules-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm
kernel-rt-modules-extra-0:4.18.0-193.119.1.rt13.170.el8_2.x86_64.rpm

7. References:

https://access.redhat.com/security/cve/CVE-2023-1829
https://access.redhat.com/security/cve/CVE-2023-3609
https://access.redhat.com/security/cve/CVE-2023-3776
https://access.redhat.com/security/cve/CVE-2023-4004
https://access.redhat.com/security/updates/classification/#important

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