A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 7.
RHSA-2021:3328-01: Important: kernel-rt security and bug fix update
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:3328-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3328
Issue date: 2021-08-31
CVE Names: CVE-2021-22555 CVE-2021-29154 CVE-2021-29650
CVE-2021-32399
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1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 7.
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 for Real Time (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, 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: out-of-bounds write in xt_compat_target_from_user() in
net/netfilter/x_tables.c (CVE-2021-22555)
* kernel: race condition for removal of the HCI controller (CVE-2021-32399)
* kernel: Local privilege escalation due to incorrect BPF JIT branch
displacement computation (CVE-2021-29154)
* kernel: lack a full memory barrier upon the assignment of a new table
value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h
may lead to DoS (CVE-2021-29650)
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 to the latest RHEL7.9.z8 source tree (BZ#1982927)
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/):
1945388 - CVE-2021-29650 kernel: lack a full memory barrier upon the assignment of a new table value in net/netfilter/x_tables.c and include/linux/netfilter/x_tables.h may lead to DoS
1946684 - CVE-2021-29154 kernel: Local privilege escalation due to incorrect BPF JIT branch displacement computation
1970807 - CVE-2021-32399 kernel: race condition for removal of the HCI controller
1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c
6. Package List:
Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source:
kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-1160.41.1.rt56.1181.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 7):
Source:
kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.src.rpm
noarch:
kernel-rt-doc-3.10.0-1160.41.1.rt56.1181.el7.noarch.rpm
x86_64:
kernel-rt-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.41.1.rt56.1181.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.41.1.rt56.1181.el7.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-2021-22555
https://access.redhat.com/security/cve/CVE-2021-29154
https://access.redhat.com/security/cve/CVE-2021-29650
https://access.redhat.com/security/cve/CVE-2021-32399
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.
