7.2 - USN-3485-1

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in the Linux kernel.

Software Description: - linux: Linux kernel - linux-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-gke: Linux kernel for Google Container Engine (GKE) 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 race condition existed in the ALSA subsystem of the Linux kernel when creating and deleting a port via ioctl(). A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15265)

Eric Biggers discovered that the key management subsystem in the Linux kernel did not properly restrict adding a key that already exists but is uninstantiated. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15299)

It was discovered that a race condition existed in the packet fanout implementation in the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15649)

Eric Biggers discovered a race condition in the key management subsystem of the Linux kernel around keys in a negative state. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-15951)

Andrey Konovalov discovered a use-after-free vulnerability in the USB serial console driver in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16525)

Andrey Konovalov discovered that the Ultra Wide Band driver in the Linux kernel did not properly check for an error condition. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16526)

Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16527)

Andrey Konovalov discovered that the ALSA subsystem in the Linux kernel did not properly validate USB audio buffer descriptors. A physically proximate attacker could use this cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16529)

Andrey Konovalov discovered that the USB unattached storage driver in the Linux kernel contained out-of-bounds error when handling alternative settings. A physically proximate attacker could use to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16530)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did not properly validate USB interface association descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16531)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did not properly validate USB HID descriptors. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16533)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did not properly validate CDC metadata. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2017-16534)

Andrey Konovalov discovered that the USB subsystem in the Linux kernel did not properly validate USB BOS metadata. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2017-16535)

Update instructions:

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

Ubuntu 16.04 LTS:
linux-image-4.4.0-101-generic 4.4.0-101.124
linux-image-4.4.0-101-generic-lpae 4.4.0-101.124
linux-image-4.4.0-101-lowlatency 4.4.0-101.124
linux-image-4.4.0-101-powerpc-e500mc 4.4.0-101.124
linux-image-4.4.0-101-powerpc-smp 4.4.0-101.124
linux-image-4.4.0-101-powerpc64-emb 4.4.0-101.124
linux-image-4.4.0-101-powerpc64-smp 4.4.0-101.124
linux-image-4.4.0-1010-kvm 4.4.0-1010.15
linux-image-4.4.0-1034-gke 4.4.0-1034.34
linux-image-4.4.0-1041-aws 4.4.0-1041.50
linux-image-4.4.0-1077-raspi2 4.4.0-1077.85
linux-image-4.4.0-1079-snapdragon 4.4.0-1079.84
linux-image-aws 4.4.0.1041.43
linux-image-generic 4.4.0.101.106
linux-image-generic-lpae 4.4.0.101.106
linux-image-gke 4.4.0.1034.35
linux-image-kvm 4.4.0.1010.10
linux-image-lowlatency 4.4.0.101.106
linux-image-powerpc-e500mc 4.4.0.101.106
linux-image-powerpc-smp 4.4.0.101.106
linux-image-powerpc64-emb 4.4.0.101.106
linux-image-powerpc64-smp 4.4.0.101.106
linux-image-raspi2 4.4.0.1077.77
linux-image-snapdragon 4.4.0.1079.71

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:
https://www.ubuntu.com/usn/usn-3485-1
CVE-2017-15265, CVE-2017-15299, CVE-2017-15649, CVE-2017-15951,
CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,
CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534,
CVE-2017-16535

Package Information:
https://launchpad.net/ubuntu/+source/linux/4.4.0-101.124
https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1041.50
https://launchpad.net/ubuntu/+source/linux-gke/4.4.0-1034.34
https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1010.15
https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1077.85
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1079.84