USN-3847-1: Linux kernel vulnerabilities

linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities

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

• Ubuntu 18.04 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-azure - Linux kernel for Microsoft Azure Cloud systems
• linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems
• linux-kvm - Linux kernel for cloud environments
• linux-oem - Linux kernel for OEM processors
• linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that a race condition existed in the raw MIDI driver for the Linux kernel, leading to a double free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-10902)

It was discovered that an integer overrun vulnerability existed in the POSIX timers implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2018-12896)

Noam Rathaus discovered that a use-after-free vulnerability existed in the Infiniband implementation in the Linux kernel. An attacker could use this to cause a denial of service (system crash). (CVE-2018-14734)

It was discovered that the YUREX USB device driver for the Linux kernel did not properly restrict user space reads or writes. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-16276)

It was discovered that the BPF verifier in the Linux kernel did not correctly compute numeric bounds in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2018-18445)

Kanda Motohiro discovered that writing extended attributes to an XFS file system in the Linux kernel in certain situations could cause an error condition to occur. A local attacker could use this to cause a denial of service. (CVE-2018-18690)

It was discovered that an integer overflow vulnerability existed in the CDROM driver of the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-18710)

Update instructions

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

Ubuntu 18.04 LTS

linux-image-4.15.0-1026-gcp - 4.15.0-1026.27

linux-image-4.15.0-1028-kvm - 4.15.0-1028.28

linux-image-4.15.0-1030-oem - 4.15.0-1030.35

linux-image-4.15.0-1030-raspi2 - 4.15.0-1030.32

linux-image-4.15.0-1031-aws - 4.15.0-1031.33

linux-image-4.15.0-1036-azure - 4.15.0-1036.38

linux-image-4.15.0-43-generic - 4.15.0-43.46

linux-image-4.15.0-43-generic-lpae - 4.15.0-43.46

linux-image-4.15.0-43-lowlatency - 4.15.0-43.46

linux-image-4.15.0-43-snapdragon - 4.15.0-43.46

linux-image-aws - 4.15.0.1031.30

linux-image-azure - 4.15.0.1036.36

linux-image-gcp - 4.15.0.1026.28

linux-image-generic - 4.15.0.43.45

linux-image-generic-lpae - 4.15.0.43.45

linux-image-gke - 4.15.0.1026.28

linux-image-kvm - 4.15.0.1028.28

linux-image-lowlatency - 4.15.0.43.45

linux-image-oem - 4.15.0.1030.35

linux-image-raspi2 - 4.15.0.1030.28

linux-image-snapdragon - 4.15.0.43.45

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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-2018-10902
• CVE-2018-12896
• CVE-2018-14734
• CVE-2018-16276
• CVE-2018-18445
• CVE-2018-18690
• CVE-2018-18710

from Ubuntu Security Notices https://ift.tt/2V1muCj