USN-2464-1: Linux kernel (OMAP4) vulnerabilities
Ubuntu Security Notice USN-2464-1
13th January, 2015
linux-ti-omap4 vulnerabilities
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 LTS
Summary
Several security issues were fixed in the kernel.
Software description
- linux-ti-omap4 - Linux kernel for OMAP4
Details
Andy Lutomirski discovered that the Linux kernel does not properly handle
faults associated with the Stack Segment (SS) register in the x86
architecture. A local attacker could exploit this flaw to gain
administrative privileges. (CVE-2014-9322)
An information leak in the Linux kernel was discovered that could leak the
high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine
(KVM) paravirt guests. A user in the guest OS could exploit this leak to
obtain information that could potentially be used to aid in attacking the
kernel. (CVE-2014-8134)
A race condition with MMIO and PIO transactions in the KVM (Kernel Virtual
Machine) subsystem of the Linux kernel was discovered. A guest OS user
could exploit this flaw to cause a denial of service (guest OS crash) via a
specially crafted application. (CVE-2014-7842)
The KVM (kernel virtual machine) subsystem of the Linux kernel
miscalculates the number of memory pages during the handling of a mapping
failure. A guest OS user could exploit this to cause a denial of service
(host OS page unpinning) or possibly have unspecified other impact by
leveraging guest OS privileges. (CVE-2014-8369)
Andy Lutomirski discovered that the Linux kernel does not properly handle
faults associated with the Stack Segment (SS) register on the x86
architecture. A local attacker could exploit this flaw to cause a denial of
service (panic). (CVE-2014-9090)
Update instructions
The problem can be corrected by updating your system to the following package version:
- Ubuntu 12.04 LTS:
- linux-image-3.2.0-1458-omap4 3.2.0-1458.78
To update your system, please follow these instructions: http://bit.ly/1aJDvTw.
After a standard system update you need to reboot your computer to make
all the necessary changes.
ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.
References
CVE-2014-7842, CVE-2014-8134, CVE-2014-8369, CVE-2014-9090, CVE-2014-9322
from Ubuntu Security Notices http://bit.ly/1DTRZzi