10 - RHSA-2015:0727

Problem Description:

Updated kernel-rt packages that fix two security issues and several bugs are now available for Red Hat Enterprise Linux 7.

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 Realtime (v. 7) - noarch, x86_64

3. Description:

The kernel-rt 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)

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

The kernel-rt packages have been upgraded to version 3.10.0-229.1.2, which provides a number of bug fixes over the previous version, including:

* The kdump service could become unresponsive due to a deadlock in the kernel call ioapic_lock.

* Attempt to make metadata changes such as creating a thin device or snapshot thin device did not error out cleanly.

(BZ#1203359)

All kernel-rt users are advised to upgrade to these updated packages, which 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/):

1181166 - CVE-2014-8159 kernel: infiniband: uverbs: unprotected physical memory access 1196581 - CVE-2015-1421 kernel: net: slab corruption from use after free on INIT collisions 1203359 - kernel-rt: rebase tree to match RHEL7.1.z source tree