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AUSCERT External Security Bulletin Redistribution
linux security update
4 March 2016
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux 7
Debian GNU/Linux 8
Impact/Access: Increased Privileges -- Console/Physical
Denial of Service -- Remote/Unauthenticated
Access Confidential Data -- Console/Physical
CVE Names: CVE-2016-2550 CVE-2016-2549 CVE-2016-2548
CVE-2016-2547 CVE-2016-2546 CVE-2016-2545
CVE-2016-2544 CVE-2016-2543 CVE-2016-2384
CVE-2016-2069 CVE-2016-0774 CVE-2016-0723
CVE-2015-8830 CVE-2015-8816 CVE-2015-8812
CVE-2015-8785 CVE-2015-8767 CVE-2015-7566
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Debian Security Advisory DSA-3503-1 email@example.com
https://www.debian.org/security/ Ben Hutchings
March 03, 2016 https://www.debian.org/security/faq
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Package : linux
CVE ID : CVE-2013-4312 CVE-2015-7566 CVE-2015-8767 CVE-2015-8785
CVE-2015-8812 CVE-2015-8816 CVE-2015-8830 CVE-2016-0723
CVE-2016-0774 CVE-2016-2069 CVE-2016-2384 CVE-2016-2543
CVE-2016-2544 CVE-2016-2545 CVE-2016-2546 CVE-2016-2547
CVE-2016-2548 CVE-2016-2549 CVE-2016-2550
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service, information
leak or data loss.
Tetsuo Handa discovered that users can use pipes queued on local
(Unix) sockets to allocate an unfair share of kernel memory, leading
to denial-of-service (resource exhaustion).
This issue was previously mitigated for the stable suite by limiting
the total number of files queued by each user on local sockets. The
new kernel version in both suites includes that mitigation plus
limits on the total size of pipe buffers allocated for each user.
Ralf Spenneberg of OpenSource Security reported that the visor
driver crashes when a specially crafted USB device without bulk-out
endpoint is detected.
An SCTP denial-of-service was discovered which can be triggered by a
local attacker during a heartbeat timeout event after the 4-way
It was discovered that local users permitted to write to a file on a
FUSE filesystem could cause a denial of service (unkillable loop in
A flaw was found in the iw_cxgb3 Infiniband driver. Whenever it
could not send a packet because the network was congested, it would
free the packet buffer but later attempt to send the packet again.
This use-after-free could result in a denial of service (crash or
hang), data loss or privilege escalation.
A use-after-free vulnerability was discovered in the USB hub driver.
This may be used by a physically present user for privilege
Ben Hawkes of Google Project Zero reported that the AIO interface
permitted reading or writing 2 GiB of data or more in a single
chunk, which could lead to an integer overflow when applied to
certain filesystems, socket or device types. The full security
impact has not been evaluated.
A use-after-free vulnerability was discovered in the TIOCGETD ioctl.
A local attacker could use this flaw for denial-of-service.
It was found that the fix for CVE-2015-1805 in kernel versions older
than Linux 3.16 did not correctly handle the case of a partially
failed atomic read. A local, unprivileged user could use this flaw
to crash the system or leak kernel memory to user space.
Andy Lutomirski discovered a race condition in flushing of the TLB
when switching tasks on an x86 system. On an SMP system this could
possibly lead to a crash, information leak or privilege escalation.
Andrey Konovalov found that a crafted USB MIDI device with an
invalid USB descriptor could trigger a double-free. This may be used
by a physically present user for privilege escalation.
Dmitry Vyukov found that the core sound sequencer driver (snd-seq)
lacked a necessary check for a null pointer, allowing a user
with access to a sound sequencer device to cause a denial-of-
CVE-2016-2544, CVE-2016-2546, CVE-2016-2547, CVE-2016-2548
Dmitry Vyukov found various race conditions in the sound subsystem
(ALSA)'s management of timers. A user with access to sound devices
could use these to cause a denial-of-service (crash or hang) or
possibly for privilege escalation.
Dmitry Vyukov found a flaw in list manipulation in the sound
subsystem (ALSA)'s management of timers. A user with access to sound
devices could use this to cause a denial-of-service (crash or hang)
or possibly for privilege escalation.
Dmitry Vyukov found a potential deadlock in the sound subsystem
(ALSA)'s use of high resolution timers. A user with access to sound
devices could use this to cause a denial-of-service (hang).
The original mitigation of CVE-2013-4312, limiting the total number
of files a user could queue on local sockets, was flawed. A user
given a local socket opened by another user, for example through the
systemd socket activation mechanism, could make use of the other
user's quota, again leading to a denial-of-service (resource
exhaustion). This is fixed by accounting queued files to the sender
rather than the socket opener.
For the oldstable distribution (wheezy), these problems have been fixed
in version 3.2.73-2+deb7u3. The oldstable distribution (wheezy) is not
affected by CVE-2015-8830.
For the stable distribution (jessie), these problems have been fixed in
version 3.16.7-ckt20-1+deb8u4. CVE-2015-7566, CVE-2015-8767 and
CVE-2016-0723 were already fixed in DSA-3448-1. CVE-2016-0774 does not
affect the stable distribution.
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: firstname.lastname@example.org
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