A linux-4.9 security update has been released for Debian GNU/Linux 8 LTS to address several vulnerabilities.

Package : linux-4.9
Version : 4.9.210-1~deb8u1
CVE ID : CVE-2018-13093 CVE-2018-13094 CVE-2018-20976 CVE-2018-21008
CVE-2019-0136 CVE-2019-2215 CVE-2019-10220 CVE-2019-14615
CVE-2019-14814 CVE-2019-14815 CVE-2019-14816 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-2019-15917
CVE-2019-16746 CVE-2019-17052 CVE-2019-17053 CVE-2019-17054
CVE-2019-17055 CVE-2019-17056 CVE-2019-17075 CVE-2019-17133
CVE-2019-17666 CVE-2019-18282 CVE-2019-18683 CVE-2019-18809
CVE-2019-19037 CVE-2019-19051 CVE-2019-19052 CVE-2019-19056
CVE-2019-19057 CVE-2019-19062 CVE-2019-19066 CVE-2019-19068
CVE-2019-19227 CVE-2019-19332 CVE-2019-19447 CVE-2019-19523
CVE-2019-19524 CVE-2019-19525 CVE-2019-19527 CVE-2019-19530
CVE-2019-19531 CVE-2019-19532 CVE-2019-19533 CVE-2019-19534
CVE-2019-19535 CVE-2019-19536 CVE-2019-19537 CVE-2019-19767
CVE-2019-19947 CVE-2019-19965 CVE-2019-20096
Debian Bug : 869511 945023

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

CVE-2018-13093, CVE-2018-13094

Wen Xu from SSLab at Gatech reported several NULL pointer
dereference flaws that may be triggered when mounting and
operating a crafted XFS volume. An attacker able to mount
arbitrary XFS volumes could use this to cause a denial of service
(crash).

CVE-2018-20976

It was discovered that the XFS file-system implementation did not
correctly handle some mount failure conditions, which could lead
to a use-after-free. The security impact of this is unclear.

CVE-2018-21008

It was discovered that the rsi wifi driver did not correctly
handle some failure conditions, which could lead to a use-after-
free. The security impact of this is unclear.

CVE-2019-0136

It was discovered that the wifi soft-MAC implementation (mac80211)
did not properly authenticate Tunneled Direct Link Setup (TDLS)
messages. A nearby attacker could use this for denial of service
(loss of wifi connectivity).

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-2019-14615

It was discovered that Intel 9th and 10th generation GPUs did not
clear user-visible state during a context switch, which resulted
in information leaks between GPU tasks. This has been mitigated
in the i915 driver.

The affected chips (gen9 and gen10) are listed at
(  https://en.wikipedia.org/wiki/List_of_Intel_graphics_processing_units#Gen9) .

CVE-2019-14814, CVE-2019-14815, CVE-2019-14816

Multiple bugs were discovered in the mwifiex wifi driver, which
could lead to heap buffer overflows. A local user permitted to
configure a device handled by this driver could probably use this
for privilege escalation.

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-2019-15917

The syzkaller tool found a race condition in code supporting
UART-attached Bluetooth adapters, which could lead to a use-
after-free. A local user with access to a pty device or other
suitable tty device could use this to cause a denial of service
(memory corruption or crash) or possibly for privilege escalation.

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-2019-17075

It was found that the cxgb4 Infiniband driver requested DMA
(Direct Memory Access) to a stack-allocated buffer, which is not
supported and on some systems can result in memory corruption of
the stack. A local user might be able to use this for denial of
service (memory corruption or crash) or possibly for privilege
escalation.

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-2019-18282

Jonathan Berger, Amit Klein, and Benny Pinkas discovered that the
generation of UDP/IPv6 flow labels used a weak hash function,
"jhash". This could enable tracking individual computers as they
communicate with different remote servers and from different
networks. The "siphash" function is now used instead.

CVE-2019-18683

Multiple race conditions were discovered in the vivid media
driver, used for testing Video4Linux2 (V4L2) applications,
These race conditions could result in a use-after-free. On a
system where this driver is loaded, a user with permission
to access media devices could use this to cause a denial
of service (memory corruption or crash) or possibly for
privilege escalation.

CVE-2019-18809

Navid Emamdoost discovered a potential memory leak in the af9005
media driver if the device fails to respond to a command. The
security impact of this is unclear.

CVE-2019-19037

It was discovered that the ext4 filesystem driver did not
correctly handle directories with holes (unallocated regions) in
them. An attacker able to mount arbitrary ext4 volumes could use
this to cause a denial of service (crash).

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-2019-19068

Navid Emamdoost discovered a potential memory leak in the rtl8xxxu
wifi driver, in case it fails to submit an interrupt buffer to the
device. 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-2019-19447

It was discovered that the ext4 filesystem driver did not safely
handle unlinking of an inode that, due to filesystem corruption,
already has a link count of 0. An attacker able to mount
arbitrary ext4 volumes 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-2019-19525

The syzkaller tool discovered a use-after-free bug in the atusb
driver for IEEE 802.15.4 networking. An attacker able to add and
remove USB devices could possibly use this to cause a denial of
service (memory corruption or crash) or 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-2019-19535, 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-2019-19947

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-2019-20096

The Hulk Robot tool discovered a potential memory leak in the DCCP
protocol implementation. This may be exploitable by local users,
or by remote attackers if the system uses DCCP, to cause a denial
of service (out of memory).

For Debian 8 "Jessie", these problems have been fixed in version
4.9.210-1~deb8u1. This update additionally fixes Debian bugs
#869511 and 945023; and includes many more bug fixes from stable
updates 4.9.190-4.9.210 inclusive.

We recommend that you upgrade your linux-4.9 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