RHSA-2015:0782 - Security Advisory

Topic

Updated kernel packages that fix multiple security issues and several bugs
are now available for Red Hat Enterprise Linux 6.5 Extended Update Support.

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.

Description

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

• It was found that the Linux kernel's Infiniband subsystem did not

properly sanitize input parameters while registering memory regions from
user space via the (u)verbs API. A local user with access to a
/dev/infiniband/uverbsX device could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2014-8159,
Important)

• A use-after-free flaw was found in the way the Linux kernel's SCTP

implementation handled authentication key reference counting during INIT
collisions. A remote attacker could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2015-1421,
Important)

• An integer overflow flaw was found in the way the Linux kernel's Frame

Buffer device implementation mapped kernel memory to user space via the
mmap syscall. A local user able to access a frame buffer device file
(/dev/fb*) could possibly use this flaw to escalate their privileges on the
system. (CVE-2013-2596, Important)

• It was found that the Linux kernel's KVM implementation did not ensure

that the host CR4 control register value remained unchanged across VM
entries on the same virtual CPU. A local, unprivileged user could use this
flaw to cause a denial of service on the system. (CVE-2014-3690, Moderate)

• It was found that the parse_rock_ridge_inode_internal() function of the

Linux kernel's ISOFS implementation did not correctly check relocated
directories when processing Rock Ridge child link (CL) tags. An attacker
with physical access to the system could use a specially crafted ISO image
to crash the system or, potentially, escalate their privileges on the
system. (CVE-2014-5471, CVE-2014-5472, Low)

• A stack-based buffer overflow flaw was found in the TechnoTrend/Hauppauge

DEC USB device driver. A local user with write access to the corresponding
device could use this flaw to crash the kernel or, potentially, elevate
their privileges on the system. (CVE-2014-8884, Low)

Red Hat would like to thank Mellanox for reporting CVE-2014-8159, and Andy
Lutomirski for reporting CVE-2014-3690. The CVE-2015-1421 issue was
discovered by Sun Baoliang of Red Hat.

This update also fixes the following bugs:

• Previously, a NULL pointer check that is needed to prevent an oops in the

nfs_async_inode_return_delegation() function was removed. As a consequence,
a NFS4 client could terminate unexpectedly. The missing NULL pointer check
has been added back, and NFS4 client no longer crashes in this situation.
(BZ#1187638)

• Due to unbalanced multicast join and leave processing, the attempt to

leave a multicast group that had not previously completed a join became
unresponsive. This update resolves multiple locking issues in the IPoIB
multicast code that allowed multicast groups to be left before the joining
was entirely completed. Now, multicast join and leave failures or lockups
no longer occur in the described situation. (BZ#1187663)

• A failure to leave a multicast group which had previously been joined

prevented the attempt to unregister from the "sa" service. Multiple locking
issues in the IPoIB multicast join and leave processing have been fixed so
that leaving a group that has completed its join process is successful.
As a result, attempts to unregister from the "sa" service no longer lock up
due to leaked resources. (BZ#1187665)

• Due to a regression, when large reads which partially extended beyond the

end of the underlying device were done, the raw driver returned the EIO
error code instead of returning a short read covering the valid part of the
device. The underlying source code has been patched, and the raw driver now
returns a short read for the remainder of the device. (BZ#1195746)

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.

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

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 x86_64
• Red Hat Enterprise Linux for x86_64 - Extended Update Support 6.5 i386
• Red Hat Enterprise Linux Server - AUS 6.5 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 6.5 s390x
• Red Hat Enterprise Linux for Power, big endian - Extended Update Support 6.5 ppc64
• Red Hat Enterprise Linux Server - TUS 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 x86_64
• Red Hat Enterprise Linux Server - Extended Update Support from RHUI 6.5 i386
• Red Hat Enterprise Linux EUS Compute Node 6.5 x86_64

Fixes

• BZ - 1034490 - CVE-2013-2596 kernel: integer overflow in fb_mmap
• BZ - 1134099 - CVE-2014-5471 CVE-2014-5472 kernel: isofs: unbound recursion when processing relocated directories
• BZ - 1153322 - CVE-2014-3690 kernel: kvm: vmx: invalid host cr4 handling across vm entries
• BZ - 1164266 - CVE-2014-8884 kernel: usb: buffer overflow in ttusb-dec
• BZ - 1181166 - CVE-2014-8159 kernel: infiniband: uverbs: unprotected physical memory access
• BZ - 1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions

CVEs

• CVE-2014-5472
• CVE-2014-5471
• CVE-2013-2596
• CVE-2014-3690
• CVE-2014-8884
• CVE-2014-8159
• CVE-2015-1421

References

• https://access.redhat.com/security/updates/classification/#important