USN-3696-1: Linux kernel vulnerabilities

2 July 2018

linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon vulnerabilities

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-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 an integer overflow existed in the perf subsystem of the Linux kernel. A local attacker could use this to cause a denial of service (system crash). (CVE-2017-18255)

Wei Fang discovered an integer overflow in the F2FS filesystem implementation in the Linux kernel. A local attacker could use this to cause a denial of service. (CVE-2017-18257)

It was discovered that an information leak existed in the generic SCSI driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-1000204)

It was discovered that the wait4() system call in the Linux kernel did not properly validate its arguments in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2018-10087)

It was discovered that the kill() system call implementation in the Linux kernel did not properly validate its arguments in some situations. A local attacker could possibly use this to cause a denial of service. (CVE-2018-10124)

Julian Stecklina and Thomas Prescher discovered that FPU register states (such as MMX, SSE, and AVX registers) which are lazily restored are potentially vulnerable to a side channel attack. A local attacker could use this to expose sensitive information. (CVE-2018-3665)

Jakub Jirasek discovered that multiple use-after-errors existed in the USB/IP 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-2018-5814)

It was discovered that an information leak vulnerability existed in the floppy driver in the Linux kernel. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2018-7755)

Seunghun Han discovered an information leak in the ACPI handling code in the Linux kernel when handling early termination of ACPI table loading. A local attacker could use this to expose sensitive informal (kernel address locations). (CVE-2017-13695)

It was discovered that a memory leak existed in the Serial Attached SCSI (SAS) implementation in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (memory exhaustion). (CVE-2018-10021)

Update instructions

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

Ubuntu 16.04 LTS
linux-image-4.4.0-1029-kvm - 4.4.0-1029.34
linux-image-4.4.0-1062-aws - 4.4.0-1062.71
linux-image-4.4.0-1092-raspi2 - 4.4.0-1092.100
linux-image-4.4.0-1095-snapdragon - 4.4.0-1095.100
linux-image-4.4.0-130-generic - 4.4.0-130.156
linux-image-4.4.0-130-generic-lpae - 4.4.0-130.156
linux-image-4.4.0-130-lowlatency - 4.4.0-130.156
linux-image-4.4.0-130-powerpc-e500mc - 4.4.0-130.156
linux-image-4.4.0-130-powerpc-smp - 4.4.0-130.156
linux-image-4.4.0-130-powerpc64-emb - 4.4.0-130.156
linux-image-4.4.0-130-powerpc64-smp - 4.4.0-130.156
linux-image-aws - 4.4.0.1062.64
linux-image-generic - 4.4.0.130.136
linux-image-generic-lpae - 4.4.0.130.136
linux-image-kvm - 4.4.0.1029.28
linux-image-lowlatency - 4.4.0.130.136
linux-image-powerpc-e500mc - 4.4.0.130.136
linux-image-powerpc-smp - 4.4.0.130.136
linux-image-powerpc64-emb - 4.4.0.130.136
linux-image-powerpc64-smp - 4.4.0.130.136
linux-image-raspi2 - 4.4.0.1092.92
linux-image-snapdragon - 4.4.0.1095.87

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