Ubuntu 14.10 : linux regression (USN-2448-2)

Ubuntu Security Notice (C) 2014-2016 Canonical, Inc. / NASL script (C) 2014-2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

USN-2448-1 fixed vulnerabilities in the Linux kernel. Due to an
unrelated regression TCP Throughput drops to zero for several drivers
after upgrading. This update fixes the problem.

We apologize for the inconvenience.

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)

Rabin Vincent, Robert Swiecki, Russell King discovered that
the ftrace subsystem of the Linux kernel does not properly
handle private syscall numbers. A local user could exploit
this flaw to cause a denial of service (OOPS).
(CVE-2014-7826)

A flaw in the handling of malformed ASCONF chunks by SCTP
(Stream Control Transmission Protocol) implementation in the
Linux kernel was discovered. A remote attacker could exploit
this flaw to cause a denial of service (system crash).
(CVE-2014-3673)

A flaw in the handling of duplicate ASCONF chunks by SCTP
(Stream Control Transmission Protocol) implementation in the
Linux kernel was discovered. A remote attacker could exploit
this flaw to cause a denial of service (panic).
(CVE-2014-3687)

It was discovered that excessive queuing by SCTP (Stream
Control Transmission Protocol) implementation in the Linux
kernel can cause memory pressure. A remote attacker could
exploit this flaw to cause a denial of service.
(CVE-2014-3688)

Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a
flaw in how the perf subsystem of the Linux kernel handles
private systecall numbers. A local user could exploit this
to cause a denial of service (OOPS) or bypass ASLR
protections via a crafted application. (CVE-2014-7825)

Andy Lutomirski discovered a flaw in how the Linux kernel
handles pivot_root when used with a chroot directory. A
local user could exploit this flaw to cause a denial of
service (mount-tree loop). (CVE-2014-7970)

Dmitry Monakhov discovered a race condition in the
ext4_file_write_iter function of the Linux kernel's ext4
filesystem. A local user could exploit this flaw to cause a
denial of service (file unavailability). (CVE-2014-8086)

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).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected linux-image-3.16-generic,
linux-image-3.16-generic-lpae and / or linux-image-3.16-lowlatency
packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.8
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

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