Skip to navigation

Security Advisory Important: kernel-rt security and bug fix update

Advisory: RHSA-2013:1490-1
Type: Security Advisory
Severity: Important
Issued on: 2013-10-31
Last updated on: 2013-10-31
Affected Products: Red Hat Enterprise MRG v2 for Red Hat Enterprise Linux (version 6)
CVEs ( CVE-2013-0343


Updated kernel-rt packages that fix multiple security issues and one bug
are now available for Red Hat Enterprise MRG 2.4.

The Red Hat Security Response Team 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.

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

* A flaw was found in the way IP packets with an Internet Header Length
(ihl) of zero were processed in the skb_flow_dissect() function in the
Linux kernel. A remote attacker could use this flaw to trigger an infinite
loop in the kernel, leading to a denial of service. (CVE-2013-4348,

* A flaw was found in the way the Linux kernel's IPv6 implementation
handled certain UDP packets when the UDP Fragmentation Offload (UFO)
feature was enabled. A remote attacker could use this flaw to crash the
system or, potentially, escalate their privileges on the system.
(CVE-2013-4387, Important)

* A flaw was found in the way the Linux kernel handled the creation of
temporary IPv6 addresses. If the IPv6 privacy extension was enabled
(/proc/sys/net/ipv6/conf/eth0/use_tempaddr set to '2'), an attacker on
the local network could disable IPv6 temporary address generation, leading
to a potential information disclosure. (CVE-2013-0343, Moderate)

* A flaw was found in the way the Linux kernel handled HID (Human Interface
Device) reports with an out-of-bounds Report ID. An attacker with physical
access to the system could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2013-2888,

* Heap-based buffer overflow flaws were found in the way the
Pantherlord/GreenAsia game controller driver, the Logitech force feedback
drivers, and the Logitech Unifying receivers driver handled HID reports.
An attacker with physical access to the system could use these flaws to
crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-2892, CVE-2013-2893, CVE-2013-2895, Moderate)

* A NULL pointer dereference flaw was found in the way the N-Trig touch
screen driver handled HID reports. An attacker with physical access to the
system could use this flaw to crash the system, resulting in a denial of
service. (CVE-2013-2896, Moderate)

* An information leak flaw was found in the way the Linux kernel's device
mapper subsystem, under certain conditions, interpreted data written to
snapshot block devices. An attacker could use this flaw to read data from
disk blocks in free space, which are normally inaccessible. (CVE-2013-4299,

* A use-after-free flaw was found in the tun_set_iff() function in the
Universal TUN/TAP device driver implementation in the Linux kernel.
A privileged user could use this flaw to crash the system or, potentially,
further escalate their privileges on the system. (CVE-2013-4343, Moderate)

* An off-by-one flaw was found in the way the ANSI CPRNG implementation in
the Linux kernel processed non-block size aligned requests. This could lead
to random numbers being generated with less bits of entropy than expected
when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

* A flaw was found in the way the Linux kernel's IPv6 SCTP implementation
interacted with the IPsec subsystem. This resulted in unencrypted SCTP
packets being sent over the network even though IPsec encryption was
enabled. An attacker able to inspect these SCTP packets could use this flaw
to obtain potentially sensitive information. (CVE-2013-4350, Moderate)

Red Hat would like to thank Fujitsu for reporting CVE-2013-4299 and Stephan
Mueller for reporting CVE-2013-4345. The CVE-2013-4348 issue was discovered
by Jason Wang of Red Hat.

Bug fix:

* RoCE appeared to be supported in the MRG Realtime kernel even when the
required user space packages from the HPN channel were not installed.
The Realtime kernel now checks for the HPN channel packages before exposing
the RoCE interfaces. RoCE devices appear as plain 10GigE devices if the
needed HPN channel user space packages are not installed. (BZ#1012993)

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.8.13-rt14, and correct these issues.
The system must be rebooted for this update to take effect.


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

This update is available via the Red Hat Network. Details on how to use the
Red Hat Network to apply this update are available at

To install kernel packages manually, use "rpm -ivh [package]". Do not use
"rpm -Uvh" as that will remove the running kernel binaries from your
system. You may use "rpm -e" to remove old kernels after determining that
the new kernel functions properly on your system.

Updated packages

Red Hat Enterprise MRG v2 for Red Hat Enterprise Linux (version 6)

File outdated by:  RHBA-2014:0381
    MD5: 5cd5224a9690afcb737fc6187c85c23c
SHA-256: 3977b5015d445261a6cc791e1d06ce3500658935373b3cc48dc040ac89bb2708
File outdated by:  RHBA-2014:0381
    MD5: 566d70c931c5d150f8add888c93471a9
SHA-256: e98e95e7ab7e83d26ed4ff061c14f25e73090f88b0ca14f1cb88a5e9e04f33fa
File outdated by:  RHBA-2014:0381
    MD5: 269767690a152069e21dc639905d6db3
SHA-256: dd3289040b6aeb6685cd1779687135d4860dcacd3ec24765156337a30173fd76
File outdated by:  RHBA-2014:0381
    MD5: d1b412744c97509a19a609216d75620e
SHA-256: 6ae84998f65f2532dc113a13fefd2ae623cb4982df7096e3956e65d6e37e4357
File outdated by:  RHBA-2014:0381
    MD5: f4a2d9d4f3818d5e3a3ad8e0df861809
SHA-256: a3141f64f42ad2c37f130089243cea833d1a9e281822af64bf6c067c711d0b46
File outdated by:  RHBA-2014:0381
    MD5: b887a956a465ea9222894ac5ff91d1fe
SHA-256: 6cc315872c9f9276d2faf7a94d815c1bfba56c8e49709bff7ec65e9a7bb54a6c
File outdated by:  RHBA-2014:0381
    MD5: b220cc4bef6e46e0fa07cc74a3d61d24
SHA-256: 4592f4c704020ac7d52283ae65be47d03f639fa7fba246f400026c358ec397b8
File outdated by:  RHBA-2014:0381
    MD5: 4eec5d4c0a745f1d2fed55ed8db5ff23
SHA-256: 400a52e7b986aa6ee49b68cc6e5feaf4e38e8c5537f0170af21afd03990dc323
File outdated by:  RHBA-2014:0381
    MD5: 5b083d9317a60a9b29f8a1db17015939
SHA-256: 3166dfc04126bc10b6501a334b5968f10d6296c9417487e68a03284baff0d634
File outdated by:  RHBA-2014:0381
    MD5: c690bf29b9474cc9f8a5d7fd9c580b1f
SHA-256: 31f3d7cbd5952aaf81c4fba93fba246e31d6127dcfad07fe61ef192f1278fa57
File outdated by:  RHBA-2014:0381
    MD5: 0dce9ed213e72472a6bc18867c805673
SHA-256: 4080102497bed1e41a8b9973bc859fc021a8b83901d5f02ee49b9030d605ccb2
File outdated by:  RHBA-2014:0381
    MD5: 935d6d48a8b28fbb998e4e1e9350f56b
SHA-256: b83b1c94c3351c45e4c128846f809d3b051b05562b7b01f3a5c57a979fb9f90a
File outdated by:  RHBA-2014:0381
    MD5: 7ff29a0706f75c75ff834f85c0fb92a7
SHA-256: 3298a3fcbb8907d025e080e7837668d6275aa1a8edfaf63ffa3d408a0f45779d
File outdated by:  RHBA-2014:0381
    MD5: 82f74a485cc9623b772ff46fea71767d
SHA-256: f741e58062290f740485dd51f05dd2de96150402c2b41f282c619b9756b32467
File outdated by:  RHBA-2014:0381
    MD5: 6ea011518f16c6cd3a03ef8a8a800fb3
SHA-256: 643e9baa6a0c58a529082a28d00056aafef831389090f8afc238ac67c9e245b9
File outdated by:  RHBA-2014:0381
    MD5: 7bbd3a81200b190cd2c3b7dcaf993605
SHA-256: ad63c8c91ba5776f44e24ea65d9f7444743ec8b37a69a27bec5421ea58fe47a6
mrg-rt-release-3.8.13-rt14.25.el6rt.noarch.rpm     MD5: 2fc4b698e9d207b6afe403e8b6764c62
SHA-256: 64cbdd4f75167b46b9de9144234d3bb9fe8de3ce7292b009c2ceb181149c9693
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

1000360 - CVE-2013-2895 Kernel: HID: logitech-dj: heap overflow flaw
1000414 - CVE-2013-2893 Kernel: HID: LG: heap overflow flaw
1000429 - CVE-2013-2892 Kernel: HID: pantherlord: heap overflow flaw
1000451 - CVE-2013-2888 Kernel: HID: memory corruption flaw
1000494 - CVE-2013-2896 Kernel: HID: ntrig: NULL pointer dereference
1004233 - CVE-2013-4299 kernel: dm: dm-snapshot data leak
1007690 - CVE-2013-4345 kernel: ansi_cprng: off by one error in non-block size request
1007733 - CVE-2013-4343 Kernel: net: use-after-free TUNSETIFF
1007872 - CVE-2013-4350 kernel: net: sctp: ipv6 ipsec encryption bug in sctp_v6_xmit
1007939 - CVE-2013-4348 kernel: net: deadloop path in skb_flow_dissect()
1011927 - CVE-2013-4387 Kernel: net: IPv6: panic when UFO=On for an interface
1012993 - mlx4: Don't show RoCE interfaces if the hpn channel is not installed
914664 - CVE-2013-0343 kernel: handling of IPv6 temporary addresses


These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:

The Red Hat security contact is More contact details at