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

Synopsis:          Moderate: linuxptp security, bug fix, and enhancement update
Advisory ID:       RHSA-2021:4321-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2021:4321
Issue date:        2021-11-09
CVE Names:         CVE-2021-3571 
=====================================================================

1. Summary:

An update for linuxptp is now available for Red Hat Enterprise Linux 8.

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 AppStream (v. 8) - aarch64, ppc64le, s390x, x86_64

3. Description:

The linuxptp packages provide Precision Time Protocol (PTP) implementation
for Linux according to IEEE standard 1588 for Linux. The dual design goals
are to provide a robust implementation of the standard and to use the most
relevant and modern Application Programming Interfaces (API) offered by the
Linux kernel. 

The following packages have been upgraded to a later upstream version:
linuxptp (3.1.1). (BZ#1895005)

Security Fix(es):

* linuxptp: wrong length of one-step follow-up in transparent clock
(CVE-2021-3571)

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.

Additional Changes:

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 8.5 Release Notes linked from 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

5. Bugs fixed (https://bugzilla.redhat.com/):

1895005 - Rebase linuxptp to 3.1
1966241 - CVE-2021-3571 linuxptp: wrong length of one-step follow-up in transparent clock

6. Package List:

Red Hat Enterprise Linux AppStream (v. 8):

Source:
linuxptp-3.1.1-1.el8.src.rpm

aarch64:
linuxptp-3.1.1-1.el8.aarch64.rpm
linuxptp-debuginfo-3.1.1-1.el8.aarch64.rpm
linuxptp-debugsource-3.1.1-1.el8.aarch64.rpm

ppc64le:
linuxptp-3.1.1-1.el8.ppc64le.rpm
linuxptp-debuginfo-3.1.1-1.el8.ppc64le.rpm
linuxptp-debugsource-3.1.1-1.el8.ppc64le.rpm

s390x:
linuxptp-3.1.1-1.el8.s390x.rpm
linuxptp-debuginfo-3.1.1-1.el8.s390x.rpm
linuxptp-debugsource-3.1.1-1.el8.s390x.rpm

x86_64:
linuxptp-3.1.1-1.el8.x86_64.rpm
linuxptp-debuginfo-3.1.1-1.el8.x86_64.rpm
linuxptp-debugsource-3.1.1-1.el8.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-2021-3571
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/8/html/8.5_release_notes/

8. Contact:

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

Copyright 2021 Red Hat, Inc.
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