A linux kernel security update has been released for Debian GNU/Linux 8 LTS to address several vulnerabilities that may lead to a privilege escalation, denial of service, or information leak.

Package : linux
Version : 3.16.81-1
CVE ID : CVE-2019-2215 CVE-2019-10220 CVE-2019-14895 CVE-2019-14896
CVE-2019-14897 CVE-2019-14901 CVE-2019-15098 CVE-2019-15217
CVE-2019-15291 CVE-2019-15505 CVE-2019-16746 CVE-2019-17052
CVE-2019-17053 CVE-2019-17054 CVE-2019-17055 CVE-2019-17056
CVE-2019-17133 CVE-2019-17666 CVE-2019-19051 CVE-2019-19052
CVE-2019-19056 CVE-2019-19057 CVE-2019-19062 CVE-2019-19066
CVE-2019-19227 CVE-2019-19332 CVE-2019-19523 CVE-2019-19524
CVE-2019-19527 CVE-2019-19530 CVE-2019-19531 CVE-2019-19532
CVE-2019-19533 CVE-2019-19534 CVE-2019-19536 CVE-2019-19537
CVE-2019-19767 CVE-2019-19922 CVE-2019-19947 CVE-2019-19965
CVE-2019-19966

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

CVE-2019-2215

The syzkaller tool discovered a use-after-free vulnerability in
the Android binder driver. A local user on a system with this
driver enabled could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.
However, this driver is not enabled on Debian packaged kernels.

CVE-2019-10220

Various developers and researchers found that if a crafted file-
system or malicious file server presented a directory with
filenames including a '/' character, this could confuse and
possibly defeat security checks in applications that read the
directory.

The kernel will now return an error when reading such a directory,
rather than passing the invalid filenames on to user-space.

CVE-2019-14895, CVE-2019-14901

ADLab of Venustech discovered potential heap buffer overflows in
the mwifiex wifi driver. On systems using this driver, a
malicious Wireless Access Point or adhoc/P2P peer could use these
to cause a denial of service (memory corruption or crash) or
possibly for remote code execution.

CVE-2019-14896, CVE-2019-14897

ADLab of Venustech discovered potential heap and stack buffer
overflows in the libertas wifi driver. On systems using this
driver, a malicious Wireless Access Point or adhoc/P2P peer could
use these to cause a denial of service (memory corruption or
crash) or possibly for remote code execution.

CVE-2019-15098

Hui Peng and Mathias Payer reported that the ath6kl wifi driver
did not properly validate USB descriptors, which could lead to a
null pointer derefernce. An attacker able to add USB devices
could use this to cause a denial of service (BUG/oops).

CVE-2019-15217

The syzkaller tool discovered that the zr364xx mdia driver did not
correctly handle devices without a product name string, which
could lead to a null pointer dereference. An attacker able to add
USB devices could use this to cause a denial of service
(BUG/oops).

CVE-2019-15291

The syzkaller tool discovered that the b2c2-flexcop-usb media
driver did not properly validate USB descriptors, which could lead
to a null pointer dereference. An attacker able to add USB
devices could use this to cause a denial of service (BUG/oops).

CVE-2019-15505

The syzkaller tool discovered that the technisat-usb2 media driver
did not properly validate incoming IR packets, which could lead to
a heap buffer over-read. An attacker able to add USB devices
could use this to cause a denial of service (BUG/oops) or to read
sensitive information from kernel memory.

CVE-2019-16746

It was discovered that the wifi stack did not validate the content
of beacon heads provided by user-space for use on a wifi interface
in Access Point mode, which could lead to a heap buffer overflow.
A local user permitted to configure a wifi interface could use
this to cause a denial of service (memory corruption or crash) or
possibly for privilege escalation.

CVE-2019-17052, CVE-2019-17053, CVE-2019-17054, CVE-2019-17055,
CVE-2019-17056

Ori Nimron reported that various network protocol implementations
- AX.25, IEEE 802.15.4, Appletalk, ISDN, and NFC - allowed all
users to create raw sockets. A local user could use this to send
arbitrary packets on networks using those protocols.

CVE-2019-17133

Nicholas Waisman reported that the wifi stack did not valdiate
received SSID information before copying it, which could lead to a
buffer overflow if it is not validated by the driver or firmware.
A malicious Wireless Access Point might be able to use this to
cause a denial of service (memory corruption or crash) or for
remote code execution.

CVE-2019-17666

Nicholas Waisman reported that the rtlwifi wifi drivers did not
properly validate received P2P information, leading to a buffer
overflow. A malicious P2P peer could use this to cause a denial
of service (memory corruption or crash) or for remote code
execution.

CVE-2019-19051

Navid Emamdoost discovered a potential memory leak in the i2400m
wimax driver if the software rfkill operation fails. The security
impact of this is unclear.

CVE-2019-19052

Navid Emamdoost discovered a potential memory leak in the gs_usb
CAN driver if the open (interface-up) operation fails. The
security impact of this is unclear.

CVE-2019-19056, CVE-2019-19057

Navid Emamdoost discovered potential memory leaks in the mwifiex
wifi driver if the probe operation fails. The security impact of
this is unclear.

CVE-2019-19062

Navid Emamdoost discovered a potential memory leak in the AF_ALG
subsystem if the CRYPTO_MSG_GETALG operation fails. A local user
could possibly use this to cause a denial of service (memory
exhaustion).

CVE-2019-19066

Navid Emamdoost discovered a potential memory leak in the bfa SCSI
driver if the get_fc_host_stats operation fails. The security
impact of this is unclear.

CVE-2019-19227

Dan Carpenter reported missing error checks in the Appletalk
protocol implementation that could lead to a null pointer
dereference. The security impact of this is unclear.

CVE-2019-19332

The syzkaller tool discovered a missing bounds check in the KVM
implementation for x86, which could lead to a heap buffer overflow.
A local user permitted to use KVM could use this to cause a denial
of service (memory corruption or crash) or possibly for privilege
escalation.

CVE-2019-19523

The syzkaller tool discovered a use-after-free bug in the adutux
USB driver. An attacker able to add and remove USB devices could
use this to cause a denial of service (memory corruption or crash)
or possibly for privilege escalation.

CVE-2019-19524

The syzkaller tool discovered a race condition in the ff-memless
library used by input drivers. An attacker able to add and remove
USB devices could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.

CVE-2019-19527

The syzkaller tool discovered that the hiddev driver did not
correctly handle races between a task opening the device and
disconnection of the underlying hardware. A local user permitted
to access hiddev devices, and able to add and remove USB devices,
could use this to cause a denial of service (memory corruption or
crash) or possibly for privilege escalation.

CVE-2019-19530

The syzkaller tool discovered a potential use-after-free in the
cdc-acm network driver. An attacker able to add USB devices could
use this to cause a denial of service (memory corruption or crash)
or possibly for privilege escalation.

CVE-2019-19531

The syzkaller tool discovered a use-after-free bug in the yurex
USB driver. An attacker able to add and remove USB devices could
use this to cause a denial of service (memory corruption or crash)
or possibly for privilege escalation.

CVE-2019-19532

The syzkaller tool discovered a potential heap buffer overflow in
the hid-gaff input driver, which was also found to exist in many
other input drivers. An attacker able to add USB devices could
use this to cause a denial of service (memory corruption or crash)
or possibly for privilege escalation.

CVE-2019-19533

The syzkaller tool discovered that the ttusb-dec media driver was
missing initialisation of a structure, which could leak sensitive
information from kernel memory.

CVE-2019-19534, CVE-2019-19536

The syzkaller tool discovered that the peak_usb CAN driver was
missing initialisation of some structures, which could leak
sensitive information from kernel memory.

CVE-2019-19537

The syzkaller tool discovered race conditions in the USB stack,
involving character device registration. An attacker able to add
USB devices could use this to cause a denial of service (memory
corruption or crash) or possibly for privilege escalation.

CVE-2019-19767

The syzkaller tool discovered that crafted ext4 volumes could
trigger a buffer overflow in the ext4 filesystem driver. An
attacker able to mount such a volume could use this to cause a
denial of service (memory corruption or crash) or possibly for
privilege escalation.

CVE-2019-19922

It was discovered that a change in Linux 3.16.61, "sched/fair: Fix
bandwidth timer clock drift condition", could lead to tasks being
throttled before using their full quota of CPU time. A local
user could use this bug to slow down other users' tasks. This
change has been reverted.

CVE-2019-19947

It was discovered that the kvaser_usb CAN driver was missing
initialisation of some structures, which could leak sensitive
information from kernel memory.

CVE-2019-19965

Gao Chuan reported a race condition in the libsas library used by
SCSI host drivers, which could lead to a null pointer dereference.
An attacker able to add and remove SCSI devices could use this to
cause a denial of service (BUG/oops).

CVE-2019-19966

The syzkaller tool discovered a missing error check in the cpia2
media driver, which could lead to a use-after-free. An attacker
able to add USB devices could use this to cause a denial of
service (memory corruption or crash) or possibly for privilege
escalation.

For Debian 8 "Jessie", these problems have been fixed in version
3.16.81-1.

We recommend that you upgrade your linux packages.

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