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AUSCERT External Security Bulletin Redistribution
[DLA 1771-1] linux-4.9 security update
6 May 2019
AusCERT Security Bulletin Summary
Operating System: Debian GNU/Linux
Debian GNU/Linux 8
Impact/Access: Root Compromise -- Existing Account
Access Privileged Data -- Remote/Unauthenticated
Denial of Service -- Remote/Unauthenticated
CVE Names: CVE-2019-9213 CVE-2019-8980 CVE-2019-7222
CVE-2019-7221 CVE-2019-6974 CVE-2019-3819
CVE-2019-3701 CVE-2019-3460 CVE-2019-3459
CVE-2018-1000026 CVE-2018-20169 CVE-2018-19985
CVE-2018-19824 CVE-2018-16884 CVE-2018-14625
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Package : linux-4.9
Version : 4.9.168-1~deb8u1
CVE ID : CVE-2018-14625 CVE-2018-16884 CVE-2018-19824 CVE-2018-19985
CVE-2018-20169 CVE-2018-1000026 CVE-2019-3459 CVE-2019-3460
CVE-2019-3701 CVE-2019-3819 CVE-2019-6974 CVE-2019-7221
CVE-2019-7222 CVE-2019-8980 CVE-2019-9213
Debian Bug : 904385 918103 922306
Several vulnerabilities have been discovered in the Linux kernel that
may lead to a privilege escalation, denial of service or information
A use-after-free bug was found in the vhost driver for the Virtual
Socket protocol. If this driver is used to communicate with a
malicious virtual machine guest, the guest could read sensitive
information from the host kernel.
A flaw was found in the NFS 4.1 client implementation. Mounting
NFS shares in multiple network namespaces at the same time could
lead to a user-after-free. Local users might be able to use this
for denial of service (memory corruption or crash) or possibly
for privilege escalation.
This can be mitigated by disabling unprivileged users from
creating user namespaces, which is the default in Debian.
Hui Peng and Mathias Payer discovered a use-after-free bug in the
USB audio driver. A physically present attacker able to attach a
specially designed USB device could use this for privilege
Hui Peng and Mathias Payer discovered a missing bounds check in the
hso USB serial driver. A physically present user able to attach a
specially designed USB device could use this to read sensitive
information from the kernel or to cause a denial of service
Hui Peng and Mathias Payer discovered missing bounds checks in the
USB core. A physically present attacker able to attach a specially
designed USB device could use this to cause a denial of service
(crash) or possibly for privilege escalation.
It was discovered that Linux could forward aggregated network
packets with a segmentation size too large for the output device.
In the specific case of Broadcom NetXtremeII 10Gb adapters, this
would result in a denial of service (firmware crash). This update
adds a mitigation to the bnx2x driver for this hardware.
Shlomi Oberman, Yuli Shapiro and Karamba Security Ltd. research
team discovered missing range checks in the Bluetooth L2CAP
implementation. If Bluetooth is enabled, a nearby attacker
could use these to read sensitive information from the kernel.
Muyu Yu and Marcus Meissner reported that the CAN gateway
implementation allowed the frame length to be modified, typically
resulting in out-of-bounds memory-mapped I/O writes. On a system
with CAN devices present, a local user with CAP_NET_ADMIN
capability in the initial net namespace could use this to cause a
crash (oops) or other hardware-dependent impact.
A potential infinite loop was discovered in the HID debugfs
interface exposed under /sys/kernel/debug/hid. A user with access
to these files could use this for denial of service.
This interface is only accessible to root by default, which fully
mitigates the issue.
Jann Horn reported a use-after-free bug in KVM. A local user
with access to /dev/kvm could use this to cause a denial of
service (memory corruption or crash) or possibly for privilege
Jim Mattson and Felix Wilhelm reported a user-after-free bug in
KVM's nested VMX implementation. On systems with Intel CPUs, a
local user with access to /dev/kvm could use this to cause a
denial of service (memory corruption or crash) or possibly for
Nested VMX is disabled by default, which fully mitigates the
Felix Wilhelm reported an information leak in KVM for x86.
A local user with access to /dev/kvm could use this to read
sensitive information from the kernel.
A bug was discovered in the kernel_read_file() function used to
load firmware files. In certain error conditions it could leak
memory, which might lead to a denial of service. This is probbaly
not exploitable in a Debian system.
Jann Horn reported that privileged tasks could cause stack
segments, including those in other processes, to grow downward to
address 0. On systems lacking SMAP (x86) or PAN (ARM), this
exacerbated other vulnerabilities: a null pointer dereference
could be exploited for privilege escalation rather than only for
denial of service.
For Debian 8 "Jessie", these problems have been fixed in version
4.9.168-1~deb8u1. This version also includes fixes for Debian bugs
#904385, #918103, and #922306; and other fixes included in upstream
We recommend that you upgrade your linux-4.9 and linux-latest-4.9
packages. You will need to use "apt-get upgrade --with-new-pkgs"
or "apt upgrade" as the binary package names have changed.
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
Ben Hutchings - Debian developer, member of kernel, installer and LTS teams
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