USN-3631-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-kvm - Linux kernel for cloud environments
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

It was discovered that a buffer overread vulnerability existed in the
keyring subsystem of the Linux kernel. A local attacker could possibly use
this to expose sensitive information (kernel memory). (CVE-2017-13305)

It was discovered that the DM04/QQBOX USB driver in the Linux kernel did
not properly handle device attachment and warm-start. A physically
proximate attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2017-16538)

Luo Quan and Wei Yang discovered that a race condition existed in the
Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when
handling ioctl()s. A local attacker could use this to cause a denial of
service (system deadlock). (CVE-2018-1000004)

Wang Qize discovered that an information disclosure vulnerability existed
in the SMBus driver for ACPI Embedded Controllers in the Linux kernel. A
local attacker could use this to expose sensitive information (kernel
pointer addresses). (CVE-2018-5750)

范龙飞 discovered that a race condition existed in the Advanced Linux
Sound Architecture (ALSA) subsystem of the Linux kernel that could lead to
a use-after-free or an out-of-bounds buffer access. A local attacker with
access to /dev/snd/seq could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2018-7566)

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 16.04

• linux-image-4.4.0-1021-kvm - 4.4.0-1021.26
• linux-image-4.4.0-1055-aws - 4.4.0-1055.64
• linux-image-4.4.0-1087-raspi2 - 4.4.0-1087.95
• linux-image-4.4.0-1090-snapdragon - 4.4.0-1090.95
• linux-image-4.4.0-121-generic - 4.4.0-121.145
• linux-image-4.4.0-121-generic-lpae - 4.4.0-121.145
• linux-image-4.4.0-121-lowlatency - 4.4.0-121.145
• linux-image-4.4.0-121-powerpc-e500mc - 4.4.0-121.145
• linux-image-4.4.0-121-powerpc-smp - 4.4.0-121.145
• linux-image-4.4.0-121-powerpc64-emb - 4.4.0-121.145
• linux-image-4.4.0-121-powerpc64-smp - 4.4.0-121.145

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

• CVE-2017-13305
• CVE-2017-16538
• CVE-2018-1000004
• CVE-2018-5750
• CVE-2018-7566

Related notices

• USN-3655-1: linux-image-extra-3.13.0-149-generic, linux-image-3.13.0-149-powerpc-e500, linux-image-3.13.0-149-generic, linux-image-3.13.0-149-powerpc-e500mc, linux-image-3.13.0-149-powerpc-smp, linux-image-3.13.0-149-generic-lpae, linux-image-3.13.0-149-powerpc64-smp, linux-image-3.13.0-149-lowlatency, linux-image-3.13.0-149-powerpc64-emb, linux
• USN-3631-2: linux-aws, linux-image-4.4.0-1017-aws, linux-image-extra-4.4.0-121-generic, linux-lts-xenial, linux-image-4.4.0-121-lowlatency, linux-image-4.4.0-121-powerpc64-smp, linux-image-4.4.0-121-generic, linux-image-4.4.0-121-generic-lpae, linux-image-4.4.0-121-powerpc-e500mc, linux-image-4.4.0-121-powerpc64-emb, linux-image-4.4.0-121-powerpc-smp
• USN-3655-2: linux-image-generic-lpae-lts-trusty, linux-image-3.13.0-149-generic, linux-image-generic-lts-trusty, linux-image-3.13.0-149-generic-lpae, linux-lts-trusty
• USN-3754-1: linux-image-3.13.0-157-generic, linux-image-3.13.0-157-powerpc64-smp, linux-image-3.13.0-157-generic-lpae, linux-image-extra-3.13.0-157-generic, linux-image-3.13.0-157-lowlatency, linux-image-3.13.0-157-powerpc64-emb, linux-image-3.13.0-157-powerpc-e500, linux-image-3.13.0-157-powerpc-smp, linux, linux-image-3.13.0-157-powerpc-e500mc
• USN-3798-1: linux-image-3.13.0-161-generic, linux-image-3.13.0-161-lowlatency, linux-image-3.13.0-161-powerpc-smp, linux-image-3.13.0-161-powerpc-e500mc, linux-image-3.13.0-161-powerpc64-smp, linux-image-extra-3.13.0-161-generic, linux-image-3.13.0-161-generic-lpae, linux-image-3.13.0-161-powerpc64-emb, linux, linux-image-3.13.0-161-powerpc-e500
• USN-3798-2: linux-image-3.13.0-161-generic, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-161-generic-lpae, linux-lts-trusty
• USN-3698-2: linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-image-3.13.0-153-generic, linux-lts-trusty, linux-image-3.13.0-153-generic-lpae
• USN-3697-1: linux-image-generic-lpae, linux-image-lowlatency, linux-image-generic, linux-raspi2, linux-image-4.13.0-1023-raspi2, linux-image-4.13.0-46-generic-lpae, linux-image-raspi2, linux-image-4.13.0-46-generic, linux, linux-image-4.13.0-46-lowlatency
• USN-3698-1: linux-image-3.13.0-153-powerpc64-smp, linux-image-extra-3.13.0-153-generic, linux-image-3.13.0-153-powerpc-e500, linux-image-3.13.0-153-powerpc-smp, linux-image-3.13.0-153-generic, linux-image-3.13.0-153-powerpc64-emb, linux-image-3.13.0-153-lowlatency, linux-image-3.13.0-153-powerpc-e500mc, linux, linux-image-3.13.0-153-generic-lpae
• USN-3697-2: linux-oem, linux-image-4.13.0-1031-oem