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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2015:0726-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
The remote host is missing an update for the 'kernel'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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,

* 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,

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.

This update also fixes the following bugs:

* In certain systems with multiple CPUs, when a crash was triggered on one
CPU with an interrupt handler and this CPU sent Non-Maskable Interrupt
(NMI) to another CPU, and, at the same time, ioapic_lock had already been
acquired, a deadlock occurred in ioapic_lock. As a consequence, the kdump
service could become unresponsive. This bug has been fixed and kdump now
works as expected. (BZ#1197742)

* On Lenovo X1 Carbon 3rd Gen, X250, and T550 laptops, the thinkpad_acpi
module was not properly loaded, and thus the function keys and radio
switches did not work. This update applies a new string pattern of BIOS
version, which fixes this bug, and function keys and radio switches now
work as intended. (BZ#1197743)

* During a heavy file system load involving many worker threads, all worker
threads in the pool became blocked on a resource, and no manager thread
existed to create more workers. As a consequence, the running processes
became unresponsive. With this update, the logic around manager creation
has been changed to assure that the last worker thread becomes a manager
thread and does not start executing work items. Now, a manager thread
exists, spawns new workers as needed, and processes no longer hang.

* If a thin-pool's metadata enters read-only or fail mode, for example, due
to thin-pool running out of metadata or data space, any attempt to make
metadata changes such as creating a thin device or snapshot thin device
should error out cleanly. However, previously, the kernel code returned
verbose and alarming error messages to the user. With this update, due to
early trapping of attempt to make metadata changes, informative errors are
dis ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
kernel on Red Hat Enterprise Linux Server (v. 7)

Please Install the Updated Packages.

CVSS Score:

CVSS Vector:

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2014-8159
BugTraq ID: 73060
Debian Security Information: DSA-3237 (Google Search)
RedHat Security Advisories: RHSA-2015:0674
RedHat Security Advisories: RHSA-2015:0695
RedHat Security Advisories: RHSA-2015:0726
RedHat Security Advisories: RHSA-2015:0751
RedHat Security Advisories: RHSA-2015:0782
RedHat Security Advisories: RHSA-2015:0783
RedHat Security Advisories: RHSA-2015:0803
RedHat Security Advisories: RHSA-2015:0870
RedHat Security Advisories: RHSA-2015:0919
SuSE Security Announcement: SUSE-SU-2015:1478 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1487 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1488 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1489 (Google Search)
SuSE Security Announcement: SUSE-SU-2015:1491 (Google Search)
Common Vulnerability Exposure (CVE) ID: CVE-2015-1421
BugTraq ID: 72356
Debian Security Information: DSA-3170 (Google Search)
RedHat Security Advisories: RHSA-2015:0864
RedHat Security Advisories: RHSA-2015:1082
SuSE Security Announcement: SUSE-SU-2015:0832 (Google Search)
CopyrightCopyright (C) 2015 Greenbone Networks GmbH

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