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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2022:7134-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2022:7134
Issue date:        2022-10-25
CVE Names:         CVE-2022-0494 CVE-2022-1353 CVE-2022-2588
                   CVE-2022-23816 CVE-2022-23825 CVE-2022-29900
                   CVE-2022-29901
====================================================================
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: a use-after-free in cls_route filter implementation may lead to
privilege escalation (CVE-2022-2588)

* kernel: information leak in  scsi_ioctl() (CVE-2022-0494)

* Kernel: A kernel-info-leak issue in pfkey_register (CVE-2022-1353)

* hw: cpu: AMD: RetBleed Arbitrary Speculative Code Execution with Return
Instructions (CVE-2022-23816, CVE-2022-29900)

* hw: cpu: AMD:  Branch Type Confusion (non-retbleed) (CVE-2022-23825)

* hw: cpu: Intel: RetBleed Arbitrary Speculative Code Execution with Return
Instructions (CVE-2022-29901)

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] BUG: using __this_cpu_add() in preemptible [00000000] - caller
is __mod_memcg_lruvec_state+0x69/0x1c0 (BZ#2122600)

* The latest RHEL 8.6.z4 kernel changes need to be merged into the RT
source tree to keep source parity between the two kernels. (BZ#2125396)

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/):

2039448 - CVE-2022-0494 kernel: information leak in  scsi_ioctl()
2066819 - CVE-2022-1353 Kernel: A kernel-info-leak issue in pfkey_register
2090226 - CVE-2022-23816 CVE-2022-29900 hw: cpu: AMD: RetBleed Arbitrary Speculative Code Execution with Return Instructions
2103148 - CVE-2022-29901 hw: cpu: Intel: RetBleed Arbitrary Speculative Code Execution with Return Instructions
2103153 - CVE-2022-23825 hw: cpu: AMD: Branch Type Confusion (non-retbleed)
2114849 - CVE-2022-2588 kernel: a use-after-free in cls_route filter implementation may lead to privilege escalation

6. Package List:

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

Source:
kernel-rt-4.18.0-372.32.1.rt7.189.el8_6.src.rpm

x86_64:
kernel-rt-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-core-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-core-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-devel-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-modules-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debuginfo-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-devel-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-kvm-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-modules-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-modules-extra-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm

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

Source:
kernel-rt-4.18.0-372.32.1.rt7.189.el8_6.src.rpm

x86_64:
kernel-rt-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-core-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-core-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-devel-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-modules-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debuginfo-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-devel-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-modules-4.18.0-372.32.1.rt7.189.el8_6.x86_64.rpm
kernel-rt-modules-extra-4.18.0-372.32.1.rt7.189.el8_6.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-2022-0494
https://access.redhat.com/security/cve/CVE-2022-1353
https://access.redhat.com/security/cve/CVE-2022-2588
https://access.redhat.com/security/cve/CVE-2022-23816
https://access.redhat.com/security/cve/CVE-2022-23825
https://access.redhat.com/security/cve/CVE-2022-29900
https://access.redhat.com/security/cve/CVE-2022-29901
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 2022 Red Hat, Inc.
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