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Test ID:1.3.6.1.4.1.25623.1.0.870737
Category:Red Hat Local Security Checks
Title:RedHat Update for kernel RHSA-2011:1849-01
Summary:The remote host is missing an update for the 'kernel'; package(s) announced via the referenced advisory.
Description:Summary:
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.

Security fix:

* Using the SG_IO IOCTL to issue SCSI requests to partitions or LVM volumes
resulted in the requests being passed to the underlying block device. If a
privileged user only had access to a single partition or LVM volume, they
could use this flaw to bypass those restrictions and gain read and write
access (and be able to issue other SCSI commands) to the entire block
device.

In KVM (Kernel-based Virtual Machine) environments using raw format virtio
disks backed by a partition or LVM volume, a privileged guest user could
bypass intended restrictions and issue read and write requests (and other
SCSI commands) on the host, and possibly access the data of other guests
that reside on the same underlying block device. Partition-based and
LVM-based storage pools are not used by default. Refer to Red Hat Bugzilla
bug 752375 for further details and a mitigation script for users who cannot
apply this update immediately. (CVE-2011-4127, Important)

Bug fixes:

* Previously, idle load balancer kick requests from other CPUs could be
serviced without first receiving an inter-processor interrupt (IPI). This
could have led to a deadlock. (BZ#750459)

* This update fixes a performance regression that may have caused processes
(including KVM guests) to hang for a number of seconds. (BZ#751403)

* When md_raid1_unplug_device() was called while holding a spinlock, under
certain device failure conditions, it was possible for the lock to be
requested again, deeper in the call chain, causing a deadlock. Now,
md_raid1_unplug_device() is no longer called while holding a spinlock.
(BZ#755545)

* In hpet_next_event(), an interrupt could have occurred between the read
and write of the HPET (High Performance Event Timer) and the value of
HPET_COUNTER was then beyond that being written to the comparator
(HPET_Tn_CMP). Consequently, the timers were overdue for up to several
minutes. Now, a comparison is performed between the value of the counter
and the comparator in the HPET code. If the counter is beyond the
comparator, the '-ETIME' error code is returned. (BZ#756426)

* Index allocation in the virtio-blk module was based on a monotonically
increasing variable 'index'. Consequently, released indexes were not reused
and after a period of time, no new were available. Now, virtio-blk uses the
ida A ...

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

Affected Software/OS:
kernel on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
4.6

CVSS Vector:
AV:L/AC:L/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-4127
http://www.openwall.com/lists/oss-security/2011/12/22/5
http://secunia.com/advisories/48898
SuSE Security Announcement: SUSE-SU-2012:0554 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2012-04/msg00021.html
SuSE Security Announcement: SUSE-SU-2015:0812 (Google Search)
http://lists.opensuse.org/opensuse-security-announce/2015-04/msg00020.html
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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