[SECURITY] [DSA 3981-1] linux security update
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Debian Security Advisory DSA-3981-1 firstname.lastname@example.org
https://www.debian.org/security/ Salvatore Bonaccorso
September 20, 2017 https://www.debian.org/security/faq
Package : linux
CVE ID : CVE-2017-7518 CVE-2017-7558 CVE-2017-10661 CVE-2017-11600
CVE-2017-12134 CVE-2017-12146 CVE-2017-12153 CVE-2017-12154
CVE-2017-14106 CVE-2017-14140 CVE-2017-14156 CVE-2017-14340
CVE-2017-14489 CVE-2017-14497 CVE-2017-1000111 CVE-2017-1000112
CVE-2017-1000251 CVE-2017-1000252 CVE-2017-1000370 CVE-2017-1000371
Debian Bug : 866511 875881
Several vulnerabilities have been discovered in the Linux kernel that
may lead to privilege escalation, denial of service or information
Andy Lutomirski discovered that KVM is prone to an incorrect debug
exception (#DB) error occurring while emulating a syscall
instruction. A process inside a guest can take advantage of this
flaw for privilege escalation inside a guest.
CVE-2017-7558 (stretch only)
Stefano Brivio of Red Hat discovered that the SCTP subsystem is
prone to a data leak vulnerability due to an out-of-bounds read
flaw, allowing to leak up to 100 uninitialized bytes to userspace.
CVE-2017-10661 (jessie only)
Dmitry Vyukov of Google reported that the timerfd facility does
not properly handle certain concurrent operations on a single file
descriptor. This allows a local attacker to cause a denial of
service or potentially execute arbitrary code.
Bo Zhang reported that the xfrm subsystem does not properly
validate one of the parameters to a netlink message. Local users
with the CAP_NET_ADMIN capability can use this to cause a denial
of service or potentially to execute arbitrary code.
CVE-2017-12134 / #866511 / XSA-229
Jan H. Schoenherr of Amazon discovered that when Linux is running
in a Xen PV domain on an x86 system, it may incorrectly merge
block I/O requests. A buggy or malicious guest may trigger this
bug in dom0 or a PV driver domain, causing a denial of service or
potentially execution of arbitrary code.
This issue can be mitigated by disabling merges on the underlying
back-end block devices, e.g.:
echo 2 > /sys/block/nvme0n1/queue/nomerges
CVE-2017-12146 (stretch only)
Adrian Salido of Google reported a race condition in access to the
"driver_override" attribute for platform devices in sysfs. If
unprivileged users are permitted to access this attribute, this
might allow them to gain privileges.
bo Zhang reported that the cfg80211 (wifi) subsystem does not
properly validate the parameters to a netlink message. Local users
with the CAP_NET_ADMIN capability (in any user namespace with a
wifi device) can use this to cause a denial of service.
Jim Mattson of Google reported that the KVM implementation for
Intel x86 processors did not correctly handle certain nested
hypervisor configurations. A malicious guest (or nested guest in a
suitable L1 hypervisor) could use this for denial of service.
Andrey Konovalov discovered that a user-triggerable division by
zero in the tcp_disconnect() function could result in local denial
Otto Ebeling reported that the move_pages() system call performed
insufficient validation of the UIDs of the calling and target
processes, resulting in a partial ASLR bypass. This made it easier
for local users to exploit vulnerabilities in programs installed
with the set-UID permission bit set.
"sohu0106" reported an information leak in the atyfb video driver.
A local user with access to a framebuffer device handled by this
driver could use this to obtain sensitive information.
Richard Wareing discovered that the XFS implementation allows the
creation of files with the "realtime" flag on a filesystem with no
realtime device, which can result in a crash (oops). A local user
with access to an XFS filesystem that does not have a realtime
device can use this for denial of service.
ChunYu Wang of Red Hat discovered that the iSCSI subsystem does not
properly validate the length of a netlink message, leading to
memory corruption. A local user with permission to manage iSCSI
devices can use this for denial of service or possibly to execute
CVE-2017-14497 (stretch only)
Benjamin Poirier of SUSE reported that vnet headers are not
properly handled within the tpacket_rcv() function in the raw
packet (af_packet) feature. A local user with the CAP_NET_RAW
capability can take advantage of this flaw to cause a denial of
service (buffer overflow, and disk and memory corruption) or have
Andrey Konovalov of Google reported a race condition in the raw
packet (af_packet) feature. Local users with the CAP_NET_RAW
capability can use this for denial of service or possibly to
execute arbitrary code.
Andrey Konovalov of Google reported a race condition flaw in the
UDP Fragmentation Offload (UFO) code. A local user can use this
flaw for denial of service or possibly to execute arbitrary code.
CVE-2017-1000251 / #875881
Armis Labs discovered that the Bluetooth subsystem does not
properly validate L2CAP configuration responses, leading to a
stack buffer overflow. This is one of several vulnerabilities
dubbed "Blueborne". A nearby attacker can use this to cause a
denial of service or possibly to execute arbitrary code on a
system with Bluetooth enabled.
CVE-2017-1000252 (stretch only)
Jan H. Schoenherr of Amazon reported that the KVM implementation
for Intel x86 processors did not correctly validate interrupt
injection requests. A local user with permission to use KVM could
use this for denial of service.
The Qualys Research Labs reported that a large argument or
environment list can result in ASLR bypass for 32-bit PIE binaries.
The Qualys Research Labs reported that a large argument
orenvironment list can result in a stack/heap clash for 32-bit
Alexander Potapenko of Google reported a race condition in the ALSA
(sound) timer driver, leading to an information leak. A local user
with permission to access sound devices could use this to obtain
Debian disables unprivileged user namespaces by default, but if they
are enabled (via the kernel.unprivileged_userns_clone sysctl) then
CVE-2017-11600, CVE-2017-14497 and CVE-2017-1000111 can be exploited
by any local user.
For the oldstable distribution (jessie), these problems have been fixed
in version 3.16.43-2+deb8u5.
For the stable distribution (stretch), these problems have been fixed in
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@example.com
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