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Red Hat Security Advisory 2021-0338-01

Red Hat Security Advisory 2021-0338-01
Posted Feb 2, 2021
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2021-0338-01 - The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements. Issues addressed include a use-after-free vulnerability.

tags | advisory, kernel
systems | linux, redhat
advisories | CVE-2020-15436, CVE-2020-35513
MD5 | 622a677916efe5c5b11e12950ab8bf03

Red Hat Security Advisory 2021-0338-01

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

Synopsis: Moderate: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:0338-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0338
Issue date: 2021-02-02
CVE Names: CVE-2020-15436 CVE-2020-35513
====================================================================
1. Summary:

An update for kernel-rt 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 for Real Time (v. 7) - noarch, x86_64
Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

3. Description:

The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.

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):

* kernel-rt: update to the latest RHEL7.9.z3 source tree (BZ#1906133)

* [kernel-rt] WARNING: CPU: 8 PID: 586 at kernel/sched/core.c:3644
migrate_enable+0x15f/0x210 (BZ#1916123)

* [kernel-rt-debug] [ BUG: bad unlock balance detected! ] [RHEL-7.9.z]
(BZ#1916130)

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
1906133 - kernel-rt: update to the latest RHEL7.9.z3 source tree
1911309 - CVE-2020-35513 kernel: Nfsd failure to clear umask after processing an open or create

6. Package List:

Red Hat Enterprise Linux for Real Time for NFV (v. 7):

Source:
kernel-rt-3.10.0-1160.15.2.rt56.1152.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.15.2.rt56.1152.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm

Red Hat Enterprise Linux for Real Time (v. 7):

Source:
kernel-rt-3.10.0-1160.15.2.rt56.1152.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-1160.15.2.rt56.1152.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-devel-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-1160.15.2.rt56.1152.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-1160.15.2.rt56.1152.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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