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

Synopsis:          Moderate: kernel security and bug fix update
Advisory ID:       RHSA-2020:5430-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2020:5430
Issue date:        2020-12-15
CVE Names:         CVE-2017-18551 CVE-2019-9454 CVE-2019-19447 
                   CVE-2019-20636 CVE-2020-12770 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.4
Advanced Update Support, Red Hat Enterprise Linux 7.4 Telco Extended Update
Support, and Red Hat Enterprise Linux 7.4 Update Services for SAP
Solutions.

Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 E4S (v. 7.4) - noarch, ppc64le, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server Optional E4S (v. 7.4) - ppc64le, x86_64
Red Hat Enterprise Linux Server Optional TUS (v. 7.4) - x86_64
Red Hat Enterprise Linux Server TUS (v. 7.4) - noarch, x86_64

3. Description:

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

Security Fix(es):

* kernel: out of bounds write in function i2c_smbus_xfer_emulated in
drivers/i2c/i2c-core-smbus.c (CVE-2017-18551)

* kernel: out of bounds write in i2c driver leads to local escalation of
privilege (CVE-2019-9454)

* kernel: mounting a crafted ext4 filesystem image, performing some
operations, and unmounting can lead to a use-after-free in ext4_put_super
in fs/ext4/super.c (CVE-2019-19447)

* kernel: out-of-bounds write via crafted keycode table (CVE-2019-20636)

* kernel: sg_write function lacks an sg_remove_request call in a certain
failure case (CVE-2020-12770)

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):

* Secure boot key is not loaded with kernel-3.10.0-1159.el7: MODSIGN:
Couldn't get UEFI MokListRT (BZ#1876951)

* RHEL7.6: no-carrier configured interfaces causes soft lockups by
mount.nfs and hang booting/shutdown process (BZ#1889770)

* [Intel Bug]: hrtimer (rdmavt RNR timer) was lost sometimes (BZ#1892996)

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/):

1757368 - CVE-2017-18551 kernel: out of bounds write in function i2c_smbus_xfer_emulated in drivers/i2c/i2c-core-smbus.c
1781679 - CVE-2019-19447 kernel: mounting a crafted ext4 filesystem image, performing some operations, and unmounting can lead to a use-after-free in ext4_put_super in fs/ext4/super.c
1818818 - CVE-2019-9454 kernel: out of bounds write in i2c driver leads to local escalation of privilege
1824059 - CVE-2019-20636 kernel: out-of-bounds write via crafted keycode table
1834845 - CVE-2020-12770 kernel: sg_write function lacks an sg_remove_request call in a certain failure case

6. Package List:

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

Source:
kernel-3.10.0-693.81.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.81.1.el7.noarch.rpm
kernel-doc-3.10.0-693.81.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.81.1.el7.x86_64.rpm
perf-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server E4S (v. 7.4):

Source:
kernel-3.10.0-693.81.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.81.1.el7.noarch.rpm
kernel-doc-3.10.0-693.81.1.el7.noarch.rpm

ppc64le:
kernel-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debug-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-devel-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-headers-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-tools-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-693.81.1.el7.ppc64le.rpm
perf-3.10.0-693.81.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
python-perf-3.10.0-693.81.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm

x86_64:
kernel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.81.1.el7.x86_64.rpm
perf-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm

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

Source:
kernel-3.10.0-693.81.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-693.81.1.el7.noarch.rpm
kernel-doc-3.10.0-693.81.1.el7.noarch.rpm

x86_64:
kernel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-devel-3.10.0-693.81.1.el7.x86_64.rpm
kernel-headers-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-693.81.1.el7.x86_64.rpm
perf-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm

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

x86_64:
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional E4S (v. 7.4):

ppc64le:
kernel-debug-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-693.81.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.ppc64le.rpm

x86_64:
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm

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

x86_64:
kernel-debug-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-693.81.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-693.81.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-693.81.1.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-2017-18551
https://access.redhat.com/security/cve/CVE-2019-9454
https://access.redhat.com/security/cve/CVE-2019-19447
https://access.redhat.com/security/cve/CVE-2019-20636
https://access.redhat.com/security/cve/CVE-2020-12770
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2020 Red Hat, Inc.
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