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

Synopsis:          Moderate: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2021:0336-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:0336
Issue date:        2021-02-02
CVE Names:         CVE-2020-15436 CVE-2020-35513
====================================================================
1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 7.

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 Client (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Client Optional (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode (v. 7) - noarch, x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - noarch, ppc64, ppc64le, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - noarch, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 7) - x86_64

3. Description:

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

Security Fix(es):

* kernel: use-after-free in fs/block_dev.c (CVE-2020-15436)

* kernel: Nfsd failure to clear umask after processing an open or create
(CVE-2020-35513)

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):

* double free issue in filelayout_alloc_commit_info (BZ#1679980)

* Regression: Plantronics Device SHS2355-11 PTT button does not work after
update to 7.7 (BZ#1769502)

* Openstack network node reports unregister_netdevice: waiting for
qr-3cec0c92-9a to become free. Usage count = 1 (BZ#1809519)

* dlm: add ability to interrupt waiting for acquire POSIX lock (BZ#1826858)

* [Azure][RHEL7] soft lockups and performance loss occurring during final
fsync with parallel dd writes to xfs filesystem in azure instance
(BZ#1859364)

* Guest crashed when hotplug vcpus on booting kernel stage (BZ#1866138)

* soft lockup occurs while a thread group leader is waiting on
tasklist_waiters in mm_update_next_owner() where a huge number of the
thread group members are exiting and trying to take the tasklist_lock.
(BZ#1872110)

* [DELL EMC 7.6 BUG] Kioxia CM6 NVMe drive fails to enumerate (BZ#1883403)

* [Hyper-V][RHEL7] Request to included a commit that adds a timeout to
vmbus_wait_for_unload (BZ#1888979)

* Unable to discover the LUNs from new storage port (BZ#1889311)

* RHEL 7.9 Kernel panic at ceph_put_snap_realm+0x21 (BZ#1890386)

* A hard lockup occurrs where one task is looping in an sk_lock spinlock
that has been taken by another task running timespec64_add_ns().
(BZ#1890911)

* ethtool/mlx5_core provides incorrect SFP module info (BZ#1896756)

* RHEL7.7 - zcrypt: Fix ZCRYPT_PERDEV_REQCNT ioctl (BZ#1896826)

* RHEL7.7 - s390/dasd: Fix zero write for FBA devices (BZ#1896839)

* [Azure]IP forwarding issue in netvsc[7.9.z] (BZ#1898280)

* Security patch for CVE-2020-25212 breaks directory listings via 'ls' on
NFS V4.2 shares mounted with selinux enabled labels (BZ#1917504)

Enhancement(s):

* RFE : handle better ERRbaduid on SMB1 (BZ#1847041)

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/):

1901168 - CVE-2020-15436 kernel: use-after-free in fs/block_dev.c
1905208 - CVE-2020-35513 kernel: fix nfsd failure to clear umask after processing an open or create [rhel-7]
1911309 - CVE-2020-35513 kernel: Nfsd failure to clear umask after processing an open or create
1917504 - Security patch for CVE-2020-25212 breaks directory listings via 'ls' on NFS V4.2 shares mounted with selinux enabled labels

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
kernel-3.10.0-1160.15.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm
kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm

x86_64:
bpftool-3.10.0-1160.15.2.el7.x86_64.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm
perf-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux Client Optional (v. 7):

x86_64:
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode (v. 7):

Source:
kernel-3.10.0-1160.15.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm
kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm

x86_64:
bpftool-3.10.0-1160.15.2.el7.x86_64.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm
perf-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

x86_64:
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
kernel-3.10.0-1160.15.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm
kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm

ppc64:
bpftool-3.10.0-1160.15.2.el7.ppc64.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-bootwrapper-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debug-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-devel-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-headers-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-tools-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.ppc64.rpm
perf-3.10.0-1160.15.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
python-perf-3.10.0-1160.15.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm

ppc64le:
bpftool-3.10.0-1160.15.2.el7.ppc64le.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-bootwrapper-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debug-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-devel-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-headers-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-tools-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.ppc64le.rpm
perf-3.10.0-1160.15.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
python-perf-3.10.0-1160.15.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm

s390x:
bpftool-3.10.0-1160.15.2.el7.s390x.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm
kernel-3.10.0-1160.15.2.el7.s390x.rpm
kernel-debug-3.10.0-1160.15.2.el7.s390x.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.s390x.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm
kernel-debuginfo-common-s390x-3.10.0-1160.15.2.el7.s390x.rpm
kernel-devel-3.10.0-1160.15.2.el7.s390x.rpm
kernel-headers-3.10.0-1160.15.2.el7.s390x.rpm
kernel-kdump-3.10.0-1160.15.2.el7.s390x.rpm
kernel-kdump-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm
kernel-kdump-devel-3.10.0-1160.15.2.el7.s390x.rpm
perf-3.10.0-1160.15.2.el7.s390x.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm
python-perf-3.10.0-1160.15.2.el7.s390x.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.s390x.rpm

x86_64:
bpftool-3.10.0-1160.15.2.el7.x86_64.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm
perf-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux Server Optional (v. 7):

ppc64:
bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-debuginfo-common-ppc64-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.ppc64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64.rpm

ppc64le:
bpftool-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-debuginfo-common-ppc64le-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.ppc64le.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.ppc64le.rpm

x86_64:
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
kernel-3.10.0-1160.15.2.el7.src.rpm

noarch:
kernel-abi-whitelists-3.10.0-1160.15.2.el7.noarch.rpm
kernel-doc-3.10.0-1160.15.2.el7.noarch.rpm

x86_64:
bpftool-3.10.0-1160.15.2.el7.x86_64.rpm
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-devel-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-headers-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-3.10.0-1160.15.2.el7.x86_64.rpm
perf-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm

Red Hat Enterprise Linux Workstation Optional (v. 7):

x86_64:
bpftool-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-1160.15.2.el7.x86_64.rpm
perf-debuginfo-3.10.0-1160.15.2.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-1160.15.2.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-2020-15436
https://access.redhat.com/security/cve/CVE-2020-35513
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 2021 Red Hat, Inc.
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