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Ubuntu 16.04 LTS USN-3695-2 Moderate: Linux Kernel DoS and Leak

ubuntu
Calendar Grey July 2, 2018
Dist Ubuntu Esm H88
Ensure your system's integrity with this notice regarding Ubuntu kernel revisions targeting severe security vulnerabilities as of July 2, 2018.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux-azure: Linux kernel for Microsoft Azure Cloud systems

- linux-hwe: Linux hardware enablement (HWE) kernel

Details:

USN-3695-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04

LTS. This update provides the corresponding updates for the Linux

Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu

16.04 LTS.

Wen Xu discovered that the ext4 file system implementation in the Linux

kernel did not properly initialize the crc32c checksum driver. A local

attacker could use this to cause a denial of service (system crash).

(CVE-2018-1094)

It was discovered that the cdrom driver in the Linux kernel contained an

incorrect bounds check. A local attacker could use this to expose sensitive

information (kernel memory). (CVE-2018-10940)

Wen Xu discovered that the ext4 file system implementation in the Linux

kernel did not properly validate xattr sizes. A local attacker could use

this to ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate denial of service information leak kernel ubuntu

Update Instructions

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

Ubuntu 16.04 LTS:
  linux-image-4.15.0-1014-azure   4.15.0-1014.14~16.04.1
  linux-image-4.15.0-24-generic   4.15.0-24.26~16.04.1
  linux-image-4.15.0-24-generic-lpae  4.15.0-24.26~16.04.1
  linux-image-4.15.0-24-lowlatency  4.15.0-24.26~16.04.1
  linux-image-azure               4.15.0.1014.21
  linux-image-generic-hwe-16.04   4.15.0.24.46
  linux-image-generic-lpae-hwe-16.04  4.15.0.24.46
  linux-image-lowlatency-hwe-16.04  4.15.0.24.46

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://ubuntu.com/security/notices/USN-3695-2

https://ubuntu.com/security/notices/USN-3695-1

CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,

CVE-2018-7755

Severity
important
Lowest
Low
Medium
High
Critical

July 02, 2018

Topics%20covered

Topics Covered

security advisory moderate denial of service information leak kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14~16.04.1
https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-24.26~16.04.1

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