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

Advisory: RHSA-2014:0439-1
Type: Security Advisory
Severity: Important
Issued on: 2014-04-28
Last updated on: 2014-04-28
Affected Products: Red Hat Enterprise MRG v2 for Red Hat Enterprise Linux (version 6)
CVEs ( CVE-2013-4483


Updated kernel-rt packages that fix multiple security issues, several bugs,
and add various enhancements are now available for Red Hat Enterprise MRG

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 denial of service flaw was found in the way the Linux kernel's IPv6
implementation processed IPv6 router advertisement (RA) packets.
An attacker able to send a large number of RA packets to a target system
could potentially use this flaw to crash the target system. (CVE-2014-2309,

* A flaw was found in the way the Linux kernel's netfilter connection
tracking implementation for Datagram Congestion Control Protocol (DCCP)
packets used the skb_header_pointer() function. A remote attacker could use
this flaw to send a specially crafted DCCP packet to crash the system or,
potentially, escalate their privileges on the system. (CVE-2014-2523,

* A flaw was found in the way the Linux kernel's CIFS implementation
handled uncached write operations with specially crafted iovec structures.
An unprivileged local user with access to a CIFS share could use this flaw
to crash the system, leak kernel memory, or, potentially, escalate their
privileges on the system. (CVE-2014-0069, Moderate)

* A flaw was found in the way the Linux kernel handled pending Floating
Pointer Unit (FPU) exceptions during the switching of tasks. A local
attacker could use this flaw to terminate arbitrary processes on the
system, causing a denial of service, or, potentially, escalate their
privileges on the system. Note that this flaw only affected systems using
AMD CPUs on both 32-bit and 64-bit architectures. (CVE-2014-1438, Moderate)

* It was found that certain protocol handlers in the Linux kernel's
networking implementation could set the addr_len value without initializing
the associated data structure. A local, unprivileged user could use this
flaw to leak kernel stack memory to user space using the recvmsg, recvfrom,
and recvmmsg system calls. (CVE-2013-7263, CVE-2013-7265, Low)

* An information leak flaw was found in the Linux kernel's netfilter
connection tracking IRC NAT helper implementation that could allow a remote
attacker to disclose portions of kernel stack memory during IRC DCC (Direct
Client-to-Client) communication over NAT. (CVE-2014-1690, Low)

* A denial of service flaw was discovered in the way the Linux kernel's
SELinux implementation handled files with an empty SELinux security
context. A local user who has the CAP_MAC_ADMIN capability could use this
flaw to crash the system. (CVE-2014-1874, Low)

Red Hat would like to thank Al Viro for reporting CVE-2014-0069.
The CVE-2014-1690 issue was discovered by Daniel Borkmann of Red Hat.

This update also fixes several bugs and adds multiple enhancements.
Documentation for these changes will be available shortly from the
Technical Notes document linked to in the References section.

Users are advised to upgrade to these updated packages, which upgrade the
kernel-rt kernel to version kernel-rt-3.10.33-rt32.33, correct these
issues, and fix the bugs and add the enhancements noted in the Red Hat
Enterprise MRG 2 Technical Notes. 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:  RHSA-2017:1297
    MD5: a4d8a6505a1d96fb196803b6fcc160a2
SHA-256: 92eb7bc9a553f76b16f10f77e3d5c2a4d33d41a28ad886fd09a9b6ae571dc16d
File outdated by:  RHSA-2017:1297
    MD5: dbbcad04f4fe9b080377ea1319d7bc26
SHA-256: a895e13626655318dc0b0f87ad57014869721045c1c022cf898e9d3c1e58f450
File outdated by:  RHSA-2017:1297
    MD5: 88a99ec17bd31711cf8502ded9964b68
SHA-256: 3af360197d7294924f7d5c5da94fb0236a2c0d666cec01669a2d0a427a6135c8
File outdated by:  RHSA-2017:1297
    MD5: 254b6f2c2b5ed368e65866910e13dbb1
SHA-256: 44126eb8a5be6e46e0a7f45db20f98532bc628dcb6fad8abe1c316b0f812a600
File outdated by:  RHSA-2017:1297
    MD5: 8004bf76e80abfe95a32ea2648d2a06b
SHA-256: 01c1a28e8f05951d629589693e71de63dd023f705d1e412d1b0d7a7ec52f71cd
File outdated by:  RHSA-2017:1297
    MD5: 20e428e693c3c12d4040d99b121b54a9
SHA-256: 5b6279e8c67f19afd9723e3742e18810e24c77e3a3339d263cddf819513762ff
File outdated by:  RHSA-2017:1297
    MD5: 12304335c38bafc3f2a186f6afed8445
SHA-256: 65b8d7da919e5f0d422039b17acdaf382a767a22cb2f02da17c4a25e23358835
File outdated by:  RHSA-2017:1297
    MD5: b48cd4fcc094845da8204bc745312ce2
SHA-256: 0b97caf332580a56d8f319bcccb159fcbaee070a1b6ec085a113887d5f99cd4a
File outdated by:  RHSA-2017:1297
    MD5: 18dc810efaecee2e0de5946379b8326d
SHA-256: e35826cd656e5ec73d9ceafa2f150881c96c929833fae90c8dd161ccbd61bc0b
File outdated by:  RHSA-2017:1297
    MD5: 06170e3eca75ac18e9936b42925c5806
SHA-256: 48a7d0f2cdd33f70f6e5005cfe193f51261a68d668a60fdbf1e6c33159ad5af2
File outdated by:  RHSA-2017:1297
    MD5: ede9d823eb503a49eaea1cd486121e53
SHA-256: b67b683232995fe9040c3e54912d895d1d2124f47a329d6a41897b490f8e4648
File outdated by:  RHSA-2017:1297
    MD5: 3e985ae0c8e05df4e0d2d6d00ad61a82
SHA-256: 87889cd358a2f81adafb2f104503662de5fad86b51d916642cf84341c876a6bf
File outdated by:  RHSA-2017:1297
    MD5: 7d97c86bb301c71c97a49b59e4ded227
SHA-256: 302dfac08e1cb547ef5123e06a05fd00f2495f8432eaa3026f452247544b7b9c
File outdated by:  RHSA-2017:1297
    MD5: 407a323ccddd568c7f9c4a6b13604fb0
SHA-256: 976ea008e08195114187cbbeafd395228d881245f4e953b813be1aeb0482d525
File outdated by:  RHSA-2017:1297
    MD5: 33e5c2770750b7955938d23641e10ca4
SHA-256: e9d0bb867c3d6679ee226b0be022cc8731d0f0b787e84745c5525810305a53a0
File outdated by:  RHSA-2017:1297
    MD5: 61763ec5209c7c940ad15355bea01ecf
SHA-256: 952ab42cbbb2b85a10ae8152279baabca09b92d025885533174853e9fe06fb07
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

1016735 - Apply IB performance patches to 3.10 realtime kernel
1032245 - RFE: rebase to a 3.10 kernel
1035875 - CVE-2013-7263 CVE-2013-7265 Kernel: net: leakage of uninitialized memory to user-space via recv syscalls
1052914 - CVE-2014-1438 kernel: x86: exceptions are not cleared in AMD FXSAVE workaround
1058748 - CVE-2014-1690 Kernel: netfilter: nf_nat: leakage of uninitialized buffer in IRC NAT helper
1058848 - Panic on unload of sit module unload and reading of /proc/<pid>/net/dev
1062356 - CVE-2014-1874 Kernel: SELinux: local denial-of-service
1064253 - CVE-2014-0069 kernel: cifs: incorrect handling of bogus user pointers during uncached writes
1067880 - hpsa driver version regression in MRG 2.5 kernel
1074471 - CVE-2014-2309 Kernel: net: IPv6: crash due to router advertisement flooding
1077343 - CVE-2014-2523 kernel: netfilter: nf_conntrack_dccp: incorrect skb_header_pointer API usages


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