[SECURITY] [DSA 3426-1] linux security update

Debian Security Advisory DSA-3426-1 [email protected]
https://www.debian.org/security/ Salvatore Bonaccorso
December 17, 2015 https://www.debian.org/security/faq

Package : linux
CVE ID : CVE-2013-7446 CVE-2015-7799 CVE-2015-7833 CVE-2015-8104
CVE-2015-8374 CVE-2015-8543

Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service, information leak
or data loss.

CVE-2013-7446

Dmitry Vyukov discovered that a particular sequence of valid
operations on local (AF_UNIX) sockets can result in a
use-after-free. This may be used to cause a denial of service
(crash) or possibly for privilege escalation.

CVE-2015-7799

It was discovered that a user granted access to /dev/ppp can cause a
denial of service (crash) by passing invalid parameters to the
PPPIOCSMAXCID ioctl. This also applies to ISDN PPP device nodes.

CVE-2015-7833

Sergej Schumilo, Hendrik Schwartke and Ralf Spenneberg discovered a
flaw in the processing of certain USB device descriptors in the
usbvision driver. An attacker with physical access to the system can
use this flaw to crash the system. This was partly fixed by the
changes listed in DSA 3396-1.

CVE-2015-8104

Jan Beulich reported a guest to host denial-of-service flaw
affecting the KVM hypervisor running on AMD processors. A malicious
guest can trigger an infinite stream of "debug" (#DB) exceptions
causing the processor microcode to enter an infinite loop where the
core never receives another interrupt. This leads to a panic of the
host kernel.

CVE-2015-8374

It was discovered that Btrfs did not correctly implement truncation
of compressed inline extents. This could lead to an information
leak, if a file is truncated and later made readable by other users.
Additionally, it could cause data loss. This has been fixed for the
stable distribution (jessie) only.

CVE-2015-8543

It was discovered that a local user permitted to create raw sockets
could cause a denial-of-service by specifying an invalid protocol
number for the socket. The attacker must have the CAP_NET_RAW
capability in their user namespace. This has been fixed for the
stable distribution (jessie) only.

For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.73-2+deb7u1. In addition, this update contains several
changes originally targeted for the upcoming Wheezy point release.

For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt20-1+deb8u1. In addition, this update contains several
changes originally targeted for the upcoming Jessie point release.

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/

Mailing list: [email protected]