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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:  1034699
SecurityTracker URL:  http://securitytracker.com/id/1034699
CVE Reference:   CVE-2015-5364, CVE-2015-5366   (Links to External Site)
Date:  Jan 19 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): RHEL 5
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-2016-0045.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0045.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-2016:0045-01] Important: kernel security update

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

Synopsis:          Important: kernel security update
Advisory ID:       RHSA-2016:0045-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0045.html
Issue date:        2016-01-19
CVE Names:         CVE-2015-5364 CVE-2015-5366 
=====================================================================

1. Summary:

Updated kernel packages that fix two security issues are now available for
Red Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security
impact. Common Vulnerability Scoring System (CVSS) base scores, which give
detailed severity ratings, are available for each vulnerability from the
CVE links in the References section.

2. Relevant releases/architectures:

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, noarch, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, noarch, x86_64

3. Description:

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

* 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)

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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 Desktop (v. 5 client):

Source:
kernel-2.6.18-408.el5.src.rpm

i386:
kernel-2.6.18-408.el5.i686.rpm
kernel-PAE-2.6.18-408.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-408.el5.i686.rpm
kernel-PAE-devel-2.6.18-408.el5.i686.rpm
kernel-debug-2.6.18-408.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-408.el5.i686.rpm
kernel-debug-devel-2.6.18-408.el5.i686.rpm
kernel-debuginfo-2.6.18-408.el5.i686.rpm
kernel-debuginfo-common-2.6.18-408.el5.i686.rpm
kernel-devel-2.6.18-408.el5.i686.rpm
kernel-headers-2.6.18-408.el5.i386.rpm
kernel-xen-2.6.18-408.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-408.el5.i686.rpm
kernel-xen-devel-2.6.18-408.el5.i686.rpm

noarch:
kernel-doc-2.6.18-408.el5.noarch.rpm

x86_64:
kernel-2.6.18-408.el5.x86_64.rpm
kernel-debug-2.6.18-408.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-debug-devel-2.6.18-408.el5.x86_64.rpm
kernel-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-408.el5.x86_64.rpm
kernel-devel-2.6.18-408.el5.x86_64.rpm
kernel-headers-2.6.18-408.el5.x86_64.rpm
kernel-xen-2.6.18-408.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-xen-devel-2.6.18-408.el5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
kernel-2.6.18-408.el5.src.rpm

i386:
kernel-2.6.18-408.el5.i686.rpm
kernel-PAE-2.6.18-408.el5.i686.rpm
kernel-PAE-debuginfo-2.6.18-408.el5.i686.rpm
kernel-PAE-devel-2.6.18-408.el5.i686.rpm
kernel-debug-2.6.18-408.el5.i686.rpm
kernel-debug-debuginfo-2.6.18-408.el5.i686.rpm
kernel-debug-devel-2.6.18-408.el5.i686.rpm
kernel-debuginfo-2.6.18-408.el5.i686.rpm
kernel-debuginfo-common-2.6.18-408.el5.i686.rpm
kernel-devel-2.6.18-408.el5.i686.rpm
kernel-headers-2.6.18-408.el5.i386.rpm
kernel-xen-2.6.18-408.el5.i686.rpm
kernel-xen-debuginfo-2.6.18-408.el5.i686.rpm
kernel-xen-devel-2.6.18-408.el5.i686.rpm

ia64:
kernel-2.6.18-408.el5.ia64.rpm
kernel-debug-2.6.18-408.el5.ia64.rpm
kernel-debug-debuginfo-2.6.18-408.el5.ia64.rpm
kernel-debug-devel-2.6.18-408.el5.ia64.rpm
kernel-debuginfo-2.6.18-408.el5.ia64.rpm
kernel-debuginfo-common-2.6.18-408.el5.ia64.rpm
kernel-devel-2.6.18-408.el5.ia64.rpm
kernel-headers-2.6.18-408.el5.ia64.rpm
kernel-xen-2.6.18-408.el5.ia64.rpm
kernel-xen-debuginfo-2.6.18-408.el5.ia64.rpm
kernel-xen-devel-2.6.18-408.el5.ia64.rpm

noarch:
kernel-doc-2.6.18-408.el5.noarch.rpm

ppc:
kernel-2.6.18-408.el5.ppc64.rpm
kernel-debug-2.6.18-408.el5.ppc64.rpm
kernel-debug-debuginfo-2.6.18-408.el5.ppc64.rpm
kernel-debug-devel-2.6.18-408.el5.ppc64.rpm
kernel-debuginfo-2.6.18-408.el5.ppc64.rpm
kernel-debuginfo-common-2.6.18-408.el5.ppc64.rpm
kernel-devel-2.6.18-408.el5.ppc64.rpm
kernel-headers-2.6.18-408.el5.ppc.rpm
kernel-headers-2.6.18-408.el5.ppc64.rpm
kernel-kdump-2.6.18-408.el5.ppc64.rpm
kernel-kdump-debuginfo-2.6.18-408.el5.ppc64.rpm
kernel-kdump-devel-2.6.18-408.el5.ppc64.rpm

s390x:
kernel-2.6.18-408.el5.s390x.rpm
kernel-debug-2.6.18-408.el5.s390x.rpm
kernel-debug-debuginfo-2.6.18-408.el5.s390x.rpm
kernel-debug-devel-2.6.18-408.el5.s390x.rpm
kernel-debuginfo-2.6.18-408.el5.s390x.rpm
kernel-debuginfo-common-2.6.18-408.el5.s390x.rpm
kernel-devel-2.6.18-408.el5.s390x.rpm
kernel-headers-2.6.18-408.el5.s390x.rpm
kernel-kdump-2.6.18-408.el5.s390x.rpm
kernel-kdump-debuginfo-2.6.18-408.el5.s390x.rpm
kernel-kdump-devel-2.6.18-408.el5.s390x.rpm

x86_64:
kernel-2.6.18-408.el5.x86_64.rpm
kernel-debug-2.6.18-408.el5.x86_64.rpm
kernel-debug-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-debug-devel-2.6.18-408.el5.x86_64.rpm
kernel-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-debuginfo-common-2.6.18-408.el5.x86_64.rpm
kernel-devel-2.6.18-408.el5.x86_64.rpm
kernel-headers-2.6.18-408.el5.x86_64.rpm
kernel-xen-2.6.18-408.el5.x86_64.rpm
kernel-xen-debuginfo-2.6.18-408.el5.x86_64.rpm
kernel-xen-devel-2.6.18-408.el5.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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