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Category:   OS (Linux)  >   Linux Kernel Vendors:   kernel.org
(Red Hat Issues Fix) Linux Kernel UDP Processing Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1035952
SecurityTracker URL:  http://securitytracker.com/id/1035952
CVE Reference:   CVE-2015-5364, CVE-2015-5366   (Links to External Site)
Date:  May 24 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 6.6
Description:   Two vulnerabilities were reported in the Linux Kernel. A remote user can cause denial of service conditions on the target system.

A remote user can send a flood of UDP packets with specially crafted checksums to cause the target application to hang [CVE-2015-5364].

A remote user can send a flood of UDP packets with specially crafted checksums to cause the target application to stop reading packets [CVE-2015-5366].

Impact:   A remote user can cause the target application to hang.

A remote user can cause the target application to stop reading packets.

Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-1100.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-1100.html (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Jul 7 2015 Linux Kernel UDP Processing Flaw Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2016:1100-01] Important: kernel security, bug fix, and enhancement update

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

Synopsis:          Important: kernel security, bug fix, and enhancement update
Advisory ID:       RHSA-2016:1100-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-1100.html
Issue date:        2016-05-24
CVE Names:         CVE-2015-5364 CVE-2015-5366 
=====================================================================

1. Summary:

An update for kernel is now available for Red Hat Enterprise Linux 6.6
Extended Update Support.

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 HPC Node EUS (v. 6.6) - noarch, x86_64
Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.6) - x86_64
Red Hat Enterprise Linux Server EUS (v. 6.6) - i386, noarch, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional EUS (v. 6.6) - i386, ppc64, s390x, x86_64

3. Description:

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

Security Fix(es):

* Two flaws were found in the way the Linux kernel's networking
implementation handled UDP packets with incorrect checksum values. A remote
attacker could potentially use these flaws to trigger an infinite loop in
the kernel, resulting in a denial of service on the system, or cause a
denial of service in applications using the edge triggered epoll
functionality. (CVE-2015-5364, CVE-2015-5366, Important)

Bug Fix(es):

* In anon_vma data structure, the degree counts number of child anon_vmas
and of VMAs that point to this anon_vma. In the unlink_anon_vma() function,
when its list is empty, anon_vma is going to be freed whether the external
refcount is zero or not, so the parent's degree should be decremented.
However, failure to decrement the degree triggered a BUG_ON() signal in
unlink_anon_vma(). The provided patch fixes this bug, and the degree is now
decremented as expected. (BZ#1326027)

Enhancement(s):

* The ixgbe NIC driver has been upgraded to upstream version 4.2.1, which
provides a number of bug fixes and enhancements over the previous version.
Notably:

NULL pointer crashes related to VLAN support have been fixed

Two more devices from the Intel X550 Ethernet controller family are now
supported: IDs 15AC and 15AD

Several PHY-related problems have been addressed: link disruptions and link
flapping

Added PHY-related support for Intel X550

System performance has been improved

(BZ#1315702)

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/):

1239029 - CVE-2015-5366 CVE-2015-5364 kernel: net: incorrect processing of checksums in UDP implementation

6. Package List:

Red Hat Enterprise Linux HPC Node EUS (v. 6.6):

Source:
kernel-2.6.32-504.49.1.el6.src.rpm

noarch:
kernel-abi-whitelists-2.6.32-504.49.1.el6.noarch.rpm
kernel-doc-2.6.32-504.49.1.el6.noarch.rpm
kernel-firmware-2.6.32-504.49.1.el6.noarch.rpm

x86_64:
kernel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.49.1.el6.x86_64.rpm
kernel-devel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-headers-2.6.32-504.49.1.el6.x86_64.rpm
perf-2.6.32-504.49.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node Optional EUS (v. 6.6):

x86_64:
kernel-debug-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.49.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.6):

Source:
kernel-2.6.32-504.49.1.el6.src.rpm

i386:
kernel-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-504.49.1.el6.i686.rpm
kernel-devel-2.6.32-504.49.1.el6.i686.rpm
kernel-headers-2.6.32-504.49.1.el6.i686.rpm
perf-2.6.32-504.49.1.el6.i686.rpm
perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm

noarch:
kernel-abi-whitelists-2.6.32-504.49.1.el6.noarch.rpm
kernel-doc-2.6.32-504.49.1.el6.noarch.rpm
kernel-firmware-2.6.32-504.49.1.el6.noarch.rpm

ppc64:
kernel-2.6.32-504.49.1.el6.ppc64.rpm
kernel-bootwrapper-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debug-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-504.49.1.el6.ppc64.rpm
kernel-devel-2.6.32-504.49.1.el6.ppc64.rpm
kernel-headers-2.6.32-504.49.1.el6.ppc64.rpm
perf-2.6.32-504.49.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm

s390x:
kernel-2.6.32-504.49.1.el6.s390x.rpm
kernel-debug-2.6.32-504.49.1.el6.s390x.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-504.49.1.el6.s390x.rpm
kernel-devel-2.6.32-504.49.1.el6.s390x.rpm
kernel-headers-2.6.32-504.49.1.el6.s390x.rpm
kernel-kdump-2.6.32-504.49.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
kernel-kdump-devel-2.6.32-504.49.1.el6.s390x.rpm
perf-2.6.32-504.49.1.el6.s390x.rpm
perf-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.s390x.rpm

x86_64:
kernel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.i686.rpm
kernel-debug-devel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-common-i686-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.49.1.el6.x86_64.rpm
kernel-devel-2.6.32-504.49.1.el6.x86_64.rpm
kernel-headers-2.6.32-504.49.1.el6.x86_64.rpm
perf-2.6.32-504.49.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm

Red Hat Enterprise Linux Server Optional EUS (v. 6.6):

i386:
kernel-debug-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.i686.rpm
kernel-debuginfo-common-i686-2.6.32-504.49.1.el6.i686.rpm
perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm
python-perf-2.6.32-504.49.1.el6.i686.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.i686.rpm

ppc64:
kernel-debug-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
kernel-debuginfo-common-ppc64-2.6.32-504.49.1.el6.ppc64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm
python-perf-2.6.32-504.49.1.el6.ppc64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.ppc64.rpm

s390x:
kernel-debug-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
kernel-debuginfo-common-s390x-2.6.32-504.49.1.el6.s390x.rpm
kernel-kdump-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
perf-debuginfo-2.6.32-504.49.1.el6.s390x.rpm
python-perf-2.6.32-504.49.1.el6.s390x.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.s390x.rpm

x86_64:
kernel-debug-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
kernel-debuginfo-common-x86_64-2.6.32-504.49.1.el6.x86_64.rpm
perf-debuginfo-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-2.6.32-504.49.1.el6.x86_64.rpm
python-perf-debuginfo-2.6.32-504.49.1.el6.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-2015-5364
https://access.redhat.com/security/cve/CVE-2015-5366
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2016 Red Hat, Inc.
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