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

Synopsis:          Important: kernel-alt security and bug fix update
Advisory ID:       RHSA-2021:1379-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:1379
Issue date:        2021-04-27
CVE Names:         CVE-2020-11669 CVE-2021-3347 CVE-2021-27364 
                   CVE-2021-27365 
=====================================================================

1. Summary:

An update for kernel-alt 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 ARM and IBM Power LE (POWER9) Server (v. 7) - aarch64, noarch, ppc64le, s390x
Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7) - aarch64, noarch, ppc64le

3. Description:

The kernel-alt packages provide the Linux kernel version 4.x.

Security Fix(es):

* kernel: Use after free via PI futex state (CVE-2021-3347)

* kernel: out-of-bounds read in libiscsi module (CVE-2021-27364)

* kernel: heap buffer overflow in the iSCSI subsystem (CVE-2021-27365)

* kernel: powerpc: guest can cause DoS on POWER9 KVM hosts (CVE-2020-11669)

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 oops when resizing ext4 filesystem [rhel-alt-7.6.z] (BZ#1790900)

* [ipv6][ipsec]:unregister_netdevice: waiting for lo to become free. Usage
count = 4 (BZ#1920805)

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/):

1824803 - CVE-2020-11669 kernel: powerpc: guest can cause DoS on POWER9 KVM hosts
1922249 - CVE-2021-3347 kernel: Use after free via PI futex state
1930078 - CVE-2021-27365 kernel: heap buffer overflow in the iSCSI subsystem
1930080 - CVE-2021-27364 kernel: out-of-bounds read in libiscsi module

6. Package List:

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server (v. 7):

Source:
kernel-alt-4.14.0-115.36.1.el7a.src.rpm

aarch64:
kernel-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debug-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debug-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debug-devel-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-devel-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-headers-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-tools-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-tools-libs-4.14.0-115.36.1.el7a.aarch64.rpm
perf-4.14.0-115.36.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
python-perf-4.14.0-115.36.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm

noarch:
kernel-abi-whitelists-4.14.0-115.36.1.el7a.noarch.rpm
kernel-doc-4.14.0-115.36.1.el7a.noarch.rpm

ppc64le:
kernel-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-bootwrapper-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debug-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debug-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-devel-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-headers-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-tools-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-tools-libs-4.14.0-115.36.1.el7a.ppc64le.rpm
perf-4.14.0-115.36.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
python-perf-4.14.0-115.36.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm

s390x:
kernel-4.14.0-115.36.1.el7a.s390x.rpm
kernel-debug-4.14.0-115.36.1.el7a.s390x.rpm
kernel-debug-debuginfo-4.14.0-115.36.1.el7a.s390x.rpm
kernel-debug-devel-4.14.0-115.36.1.el7a.s390x.rpm
kernel-debuginfo-4.14.0-115.36.1.el7a.s390x.rpm
kernel-debuginfo-common-s390x-4.14.0-115.36.1.el7a.s390x.rpm
kernel-devel-4.14.0-115.36.1.el7a.s390x.rpm
kernel-headers-4.14.0-115.36.1.el7a.s390x.rpm
kernel-kdump-4.14.0-115.36.1.el7a.s390x.rpm
kernel-kdump-debuginfo-4.14.0-115.36.1.el7a.s390x.rpm
kernel-kdump-devel-4.14.0-115.36.1.el7a.s390x.rpm
perf-4.14.0-115.36.1.el7a.s390x.rpm
perf-debuginfo-4.14.0-115.36.1.el7a.s390x.rpm
python-perf-4.14.0-115.36.1.el7a.s390x.rpm
python-perf-debuginfo-4.14.0-115.36.1.el7a.s390x.rpm

Red Hat Enterprise Linux for ARM and IBM Power LE (POWER9) Server Optional (v. 7):

aarch64:
kernel-debug-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-debuginfo-common-aarch64-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-tools-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
kernel-tools-libs-devel-4.14.0-115.36.1.el7a.aarch64.rpm
perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm
python-perf-debuginfo-4.14.0-115.36.1.el7a.aarch64.rpm

noarch:
kernel-doc-4.14.0-115.36.1.el7a.noarch.rpm

ppc64le:
kernel-debug-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debug-devel-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-debuginfo-common-ppc64le-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-tools-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
kernel-tools-libs-devel-4.14.0-115.36.1.el7a.ppc64le.rpm
perf-debuginfo-4.14.0-115.36.1.el7a.ppc64le.rpm
python-perf-debuginfo-4.14.0-115.36.1.el7a.ppc64le.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-2020-11669
https://access.redhat.com/security/cve/CVE-2021-3347
https://access.redhat.com/security/cve/CVE-2021-27364
https://access.redhat.com/security/cve/CVE-2021-27365
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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