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

Synopsis:          Important: kernel security and bug fix update
Advisory ID:       RHSA-2021:3725-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:3725
Issue date:        2021-10-05
CVE Names:         CVE-2021-22543 CVE-2021-22555 CVE-2021-32399 
                   CVE-2021-37576 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.4
Advanced Update Support.

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 Server AUS (v. 7.4) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64

3. Description:

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

Security Fix(es):

* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO
checks (CVE-2021-22543)

* 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: powerpc: KVM guest OS users can cause host OS memory corruption
(CVE-2021-37576)

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):

* [CKI kernel builds]: x86 binaries in non-x86 kernel rpms breaks systemtap
[7.9.z] (BZ#1975161)

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/):

1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks
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
1986506 - CVE-2021-37576 kernel: powerpc: KVM guest OS users can cause host OS memory corruption

6. Package List:

Red Hat Enterprise Linux Server AUS (v. 7.4):

Source:
kernel-3.10.0-693.94.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.94.1.el7.noarch.rpm
kernel-doc-3.10.0-693.94.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.94.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.94.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.94.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.94.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.94.1.el7.x86_64.rpm
perf-3.10.0-693.94.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
python-perf-3.10.0-693.94.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional AUS (v. 7.4):

x86_64:
kernel-debug-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.94.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.94.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.94.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.94.1.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-2021-22543
https://access.redhat.com/security/cve/CVE-2021-22555
https://access.redhat.com/security/cve/CVE-2021-32399
https://access.redhat.com/security/cve/CVE-2021-37576
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 2021 Red Hat, Inc.
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