ESB-2021.2273 – [RedHat] kernel-rt: Multiple vulnerabilities

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AUSCERT External Security Bulletin Redistribution

ESB-2021.2273
kernel-rt security and bug fix update
30 June 2021

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AusCERT Security Bulletin Summary
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Product: kernel-rt
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Execute Arbitrary Code/Commands — Existing Account
Denial of Service — Existing Account
Reduced Security — Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-33034 CVE-2020-26541

Reference: ESB-2021.2262
ESB-2021.2249
ESB-2021.2217
ESB-2021.2184

Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:2599

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Red Hat Security Advisory

Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:2599-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2599
Issue date: 2021-06-29
CVE Names: CVE-2020-26541 CVE-2021-33034
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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 (v. 8) – x86_64
Red Hat Enterprise Linux Real Time for NFV (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: use-after-free in net/bluetooth/hci_event.c when destroying an
hci_chan (CVE-2021-33034)

* kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
(CVE-2020-26541)

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.z1 source tree
(BZ#1965378)

* panic caused by i40e_msix_clean_rings [rhel-rt] (BZ#1965970)

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/):

1886285 – CVE-2020-26541 kernel: security bypass in certs/blacklist.c and certs/system_keyring.c
1961305 – CVE-2021-33034 kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan

6. Package List:

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

Source:
kernel-rt-4.18.0-305.7.1.rt7.79.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-kvm-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm

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

Source:
kernel-rt-4.18.0-305.7.1.rt7.79.el8_4.src.rpm

x86_64:
kernel-rt-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-core-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-core-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-devel-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-modules-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debuginfo-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-devel-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-modules-4.18.0-305.7.1.rt7.79.el8_4.x86_64.rpm
kernel-rt-modules-extra-4.18.0-305.7.1.rt7.79.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-2020-26541
https://access.redhat.com/security/cve/CVE-2021-33034
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2021 Red Hat, Inc.
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