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                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2018:1355-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2018:1355
Issue date:        2018-05-08
CVE Names:         CVE-2017-16939 CVE-2018-1068 CVE-2018-1087 
                   CVE-2018-8897 CVE-2018-1000199 
=====================================================================

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 Important. 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 Realtime (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: KVM: error in exception handling leads to wrong debug stack value
(CVE-2018-1087)

* Kernel: error in exception handling leads to DoS (CVE-2018-8897)

* Kernel: ipsec: xfrm: use-after-free leading to potential privilege
escalation (CVE-2017-16939)

* kernel: Out-of-bounds write via userland offsets in ebt_entry struct in
netfilter/ebtables.c (CVE-2018-1068)

* kernel: ptrace() incorrect error handling leads to corruption and DoS
(CVE-2018-1000199)

For more details about the security issue(s), including the impact, a CVSS
score, and other related information, refer to the CVE page(s) listed in
the References section.

Red Hat would like to thank Andy Lutomirski for reporting CVE-2018-1087 and
CVE-2018-1000199 and Nick Peterson (Everdox Tech LLC) and Andy Lutomirski
for reporting CVE-2018-8897.

Bug Fix(es):

* The kernel-rt packages have been upgraded to the 3.10.0-862.2.3 source
tree, which provides a number of bug fixes over the previous version.
(BZ#1549768)

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/):

1517220 - CVE-2017-16939 Kernel: ipsec: xfrm: use-after-free leading to potential privilege escalation
1549768 - kernel-rt: update to the RHEL7.5.z batch#1 source tree
1552048 - CVE-2018-1068 kernel: Out-of-bounds write via userland offsets in ebt_entry struct in netfilter/ebtables.c
1566837 - CVE-2018-1087 Kernel: KVM: error in exception handling leads to wrong debug stack value
1567074 - CVE-2018-8897 Kernel: error in exception handling leads to DoS
1568477 - CVE-2018-1000199 kernel: ptrace() incorrect error handling leads to corruption and DoS

6. Package List:

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

Source:
kernel-rt-3.10.0-862.2.3.rt56.806.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.2.3.rt56.806.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-kvm-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm

Red Hat Enterprise Linux Realtime (v. 7):

Source:
kernel-rt-3.10.0-862.2.3.rt56.806.el7.src.rpm

noarch:
kernel-rt-doc-3.10.0-862.2.3.rt56.806.el7.noarch.rpm

x86_64:
kernel-rt-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debug-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-kvm-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-debuginfo-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-devel-3.10.0-862.2.3.rt56.806.el7.x86_64.rpm
kernel-rt-trace-kvm-debuginfo-3.10.0-862.2.3.rt56.806.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-2017-16939
https://access.redhat.com/security/cve/CVE-2018-1068
https://access.redhat.com/security/cve/CVE-2018-1087
https://access.redhat.com/security/cve/CVE-2018-8897
https://access.redhat.com/security/cve/CVE-2018-1000199
https://access.redhat.com/security/updates/classification/#important
https://access.redhat.com/security/vulnerabilities/pop_ss

8. Contact:

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

Copyright 2018 Red Hat, Inc.
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