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Test ID:
Category:Red Hat Local Security Checks
Title:RedHat Security Advisory RHSA-2011:1212
The remote host is missing updates announced in
advisory RHSA-2011:1212.

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

This update fixes the following security issues:

* A NULL pointer dereference flaw was found in the Linux kernel's Stream
Control Transmission Protocol (SCTP) implementation. A remote attacker
could send a specially-crafted SCTP packet to a target system, resulting in
a denial of service. (CVE-2011-2482, Important)

* A flaw in the Linux kernel's client-side NFS Lock Manager (NLM)
implementation could allow a local, unprivileged user to cause a denial of
service. (CVE-2011-2491, Important)

* Buffer overflow flaws in the Linux kernel's netlink-based wireless
configuration interface implementation could allow a local user, who has
the CAP_NET_ADMIN capability, to cause a denial of service or escalate
their privileges on systems that have an active wireless interface.
(CVE-2011-2517, Important)

* A flaw was found in the way the Linux kernel's Xen hypervisor
implementation emulated the SAHF instruction. When using a
fully-virtualized guest on a host that does not use hardware assisted
paging (HAP), such as those running CPUs that do not have support for (or
those that have it disabled) Intel Extended Page Tables (EPT) or AMD
Virtualization (AMD-V) Rapid Virtualization Indexing (RVI), a privileged
guest user could trigger this flaw to cause the hypervisor to crash.
(CVE-2011-2519, Moderate)

* An off-by-one flaw was found in the __addr_ok() macro in the Linux
kernel's Xen hypervisor implementation when running on 64-bit systems. A
privileged guest user could trigger this flaw to cause the hypervisor to
crash. (CVE-2011-2901, Moderate)

* /proc/[PID]/io is world-readable by default. Previously, these files
could be read without any further restrictions. A local, unprivileged user
could read these files, belonging to other, possibly privileged processes
to gather confidential information, such as the length of a password used
in a process. (CVE-2011-2495, Low)

Red Hat would like to thank Vasily Averin for reporting CVE-2011-2491, and
Vasiliy Kulikov of Openwall for reporting CVE-2011-2495.

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

Users should upgrade to these updated packages, which contain backported
patches to correct these issues, and fix the bugs noted in the Technical
Notes. The system must be rebooted for this update to take effect.

Please note that this update is available via
Red Hat Network. To use Red Hat Network, launch the Red
Hat Update Agent with the following command: up2date

Risk factor : High

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-2482
RedHat Security Advisories: RHSA-2011:1212
Common Vulnerability Exposure (CVE) ID: CVE-2011-2491
Common Vulnerability Exposure (CVE) ID: CVE-2011-2495
Common Vulnerability Exposure (CVE) ID: CVE-2011-2517
Common Vulnerability Exposure (CVE) ID: CVE-2011-2519
Common Vulnerability Exposure (CVE) ID: CVE-2011-2901
CopyrightCopyright (c) 2011 E-Soft Inc.

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