- -------------------------------------------------------------------------
Debian Security Advisory DSA-3372-1 security@debian.org
https://www.debian.org/security/ Ben Hutchings
October 13, 2015 https://www.debian.org/security/faq
- -------------------------------------------------------------------------

Package : linux
CVE ID : CVE-2015-2925 CVE-2015-5257 CVE-2015-5283 CVE-2015-7613

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service, unauthorised
information disclosure or unauthorised information modification.

CVE-2015-2925

Jann Horn discovered that when a subdirectory of a filesystem was
bind-mounted into a chroot or mount namespace, a user that should
be confined to that chroot or namespace could access the whole of
that filesystem if they had write permission on an ancestor of
the subdirectory. This is not a common configuration for wheezy,
and the issue has previously been fixed for jessie.

CVE-2015-5257

Moein Ghasemzadeh of Istuary Innovation Labs reported that a USB
device could cause a denial of service (crash) by imitating a
Whiteheat USB serial device but presenting a smaller number of
endpoints.

CVE-2015-5283

Marcelo Ricardo Leitner discovered that creating multiple SCTP
sockets at the same time could cause a denial of service (crash)
if the sctp module had not previously been loaded. This issue
only affects jessie.

CVE-2015-7613

Dmitry Vyukov discovered that System V IPC objects (message queues
and shared memory segments) were made accessible before their
ownership and other attributes were fully initialised. If a local
user can race against another user or service creating a new IPC
object, this may result in unauthorised information disclosure,
unauthorised information modification, denial of service and/or
privilege escalation.

A similar issue existed with System V semaphore arrays, but was
less severe because they were always cleared before being fully
initialised.

For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.68-1+deb7u5.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt11-1+deb8u5.

For the unstable distribution (sid), these problems have been fixed in
version 4.2.3-1 or earlier versions.

We recommend that you upgrade your linux packages.

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/