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Red Hat Security Advisory

Synopsis: Moderate: kernel security update
Advisory ID: RHSA-2020:5656-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:5656
Issue date: 2020-12-22
CVE Names: CVE-2017-18551 CVE-2018-20836 CVE-2019-9454
CVE-2019-19046 CVE-2019-19447 CVE-2019-20636
CVE-2020-12770
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.6
Extended Update Support.

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 ComputeNode EUS (v. 7.6) – noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6) – x86_64
Red Hat Enterprise Linux Server EUS (v. 7.6) – noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 7.6) – ppc64, ppc64le, 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: race condition in smp_task_timedout() and smp_task_done() in
drivers/scsi/libsas/sas_expander.c leads to use-after-free (CVE-2018-20836)

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

* kernel: Denial Of Service in the __ipmi_bmc_register() function in
drivers/char/ipmi/ipmi_msghandler.c (CVE-2019-19046)

* 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.

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/):

1707796 – CVE-2018-20836 kernel: race condition in smp_task_timedout() and smp_task_done() in drivers/scsi/libsas/sas_expander.c leads to use-after-free
1757368 – CVE-2017-18551 kernel: out of bounds write in function i2c_smbus_xfer_emulated in drivers/i2c/i2c-core-smbus.c
1774988 – CVE-2019-19046 kernel: Denial Of Service in the __ipmi_bmc_register() function in drivers/char/ipmi/ipmi_msghandler.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 ComputeNode EUS (v. 7.6):

Source:
kernel-3.10.0-957.65.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-957.65.1.el7.noarch.rpm
kernel-doc-3.10.0-957.65.1.el7.noarch.rpm

x86_64:
bpftool-3.10.0-957.65.1.el7.x86_64.rpm
kernel-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debug-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.65.1.el7.x86_64.rpm
kernel-devel-3.10.0-957.65.1.el7.x86_64.rpm
kernel-headers-3.10.0-957.65.1.el7.x86_64.rpm
kernel-tools-3.10.0-957.65.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-957.65.1.el7.x86_64.rpm
perf-3.10.0-957.65.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
python-perf-3.10.0-957.65.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional EUS (v. 7.6):

x86_64:
kernel-debug-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-957.65.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-957.65.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 7.6):

Source:
kernel-3.10.0-957.65.1.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-957.65.1.el7.noarch.rpm
kernel-doc-3.10.0-957.65.1.el7.noarch.rpm

ppc64:
kernel-3.10.0-957.65.1.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debug-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debug-devel-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-957.65.1.el7.ppc64.rpm
kernel-devel-3.10.0-957.65.1.el7.ppc64.rpm
kernel-headers-3.10.0-957.65.1.el7.ppc64.rpm
kernel-tools-3.10.0-957.65.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-tools-libs-3.10.0-957.65.1.el7.ppc64.rpm
perf-3.10.0-957.65.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
python-perf-3.10.0-957.65.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm

ppc64le:
kernel-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debug-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-devel-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-headers-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-tools-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-957.65.1.el7.ppc64le.rpm
perf-3.10.0-957.65.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
python-perf-3.10.0-957.65.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm

s390x:
kernel-3.10.0-957.65.1.el7.s390x.rpm
kernel-debug-3.10.0-957.65.1.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-957.65.1.el7.s390x.rpm
kernel-debug-devel-3.10.0-957.65.1.el7.s390x.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-957.65.1.el7.s390x.rpm
kernel-devel-3.10.0-957.65.1.el7.s390x.rpm
kernel-headers-3.10.0-957.65.1.el7.s390x.rpm
kernel-kdump-3.10.0-957.65.1.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-957.65.1.el7.s390x.rpm
kernel-kdump-devel-3.10.0-957.65.1.el7.s390x.rpm
perf-3.10.0-957.65.1.el7.s390x.rpm
perf-debuginfo-3.10.0-957.65.1.el7.s390x.rpm
python-perf-3.10.0-957.65.1.el7.s390x.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.s390x.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 7.6):

ppc64:
kernel-debug-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-957.65.1.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-957.65.1.el7.ppc64.rpm
perf-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.ppc64.rpm

ppc64le:
kernel-debug-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-957.65.1.el7.ppc64le.rpm
perf-debuginfo-3.10.0-957.65.1.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-957.65.1.el7.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-2017-18551
https://access.redhat.com/security/cve/CVE-2018-20836
https://access.redhat.com/security/cve/CVE-2019-9454
https://access.redhat.com/security/cve/CVE-2019-19046
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/

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