[RHSA-2023:1584-01] Important: kernel-rt security and bug fix update

Tue Apr 4 09:15:08 UTC 2023

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 for NFV (v. 8) - x86_64
Red Hat Enterprise Linux for Real Time (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: stack overflow in do_proc_dointvec and proc_skip_spaces
(CVE-2022-4378)

* ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF
(CVE-2023-0266)

* kernel: FUSE filesystem low-privileged user privileges escalation
(CVE-2023-0386)

* kernel: net: CPU soft lockup in TC mirred egress-to-ingress action
(CVE-2022-4269)

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):

* Lazy irq_work does not raise softirq on PREEMPT_RT [rhel-8] (BZ#2172163)

* The latest RHEL 8.7.z3 kernel changes need to be merged into the RT
source tree to keep source parity between the two kernels. (BZ#2172278)

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/):

2150272 - CVE-2022-4269 kernel: net: CPU soft lockup in TC mirred egress-to-ingress action
2152548 - CVE-2022-4378 kernel: stack overflow in do_proc_dointvec and proc_skip_spaces
2159505 - CVE-2023-0386 kernel: FUSE filesystem low-privileged user privileges escalation
2163379 - CVE-2023-0266 ALSA: pcm: Move rwsem lock inside snd_ctl_elem_read to prevent UAF

6. Package List:

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

Source:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.src.rpm

x86_64:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-kvm-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm

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

Source:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.src.rpm

x86_64:
kernel-rt-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-core-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-devel-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-4.18.0-425.19.2.rt7.230.el8_7.x86_64.rpm
kernel-rt-modules-extra-4.18.0-425.19.2.rt7.230.el8_7.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-2022-4269
https://access.redhat.com/security/cve/CVE-2022-4378
https://access.redhat.com/security/cve/CVE-2023-0266
https://access.redhat.com/security/cve/CVE-2023-0386
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2023 Red Hat, Inc.
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