Overly broad permissions can turn one compromised account into a much larger security problem. Learn how to reduce unnecessary access, review privileges, and apply least privilege across modern Linux systems. Review Linux Privileges×

Alerts This Week
Warning Icon 1 461
Alerts This Week
Warning Icon 1 461

Ubuntu 17.04 USN-3468-1 Critical: Kernel Denial Of Service Fixes

ubuntu
Calendar Grey October 31, 2017
Scroller Ubuntu
Numerous vulnerabilities identified in the Linux kernel within Ubuntu 17.04 necessitate a critical update and system reboot for enhanced security measures.
Several security issues were fixed in the Linux kernel.

Summary

Several security issues were fixed in the Linux kernel.

Software Description:

- linux: Linux kernel

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

It was discovered that the KVM subsystem in the Linux kernel did not

properly bound guest IRQs. A local attacker in a guest VM could use this to

cause a denial of service (host system crash). (CVE-2017-1000252)

It was discovered that the Flash-Friendly File System (f2fs) implementation

in the Linux kernel did not properly validate superblock metadata. A local

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

possibly execute arbitrary code. (CVE-2017-10663)

Anthony Perard discovered that the Xen virtual block driver did not

properly initialize some data structures before passing them to user space.

A local attacker in a guest VM could use this to expose sensitive

information from the host OS or other guest VMs. (CVE-2017-10911)

It was discovered that a use-after-free vulnerability existed in the POSIX

...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu file system Linux kernel KVM

Update Instructions

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

Ubuntu 17.04:
  linux-image-4.10.0-1020-raspi2  4.10.0-1020.23
  linux-image-4.10.0-38-generic   4.10.0-38.42
  linux-image-4.10.0-38-generic-lpae  4.10.0-38.42
  linux-image-4.10.0-38-lowlatency  4.10.0-38.42
  linux-image-generic             4.10.0.38.38
  linux-image-generic-lpae        4.10.0.38.38
  linux-image-lowlatency          4.10.0.38.38
  linux-image-raspi2              4.10.0.1020.21

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-3468-1

CVE-2017-1000252, CVE-2017-10663, CVE-2017-10911, CVE-2017-11176,

CVE-2017-14340

Severity
critical
Lowest
Low
Medium
High
Critical

October 31, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu file system Linux kernel KVM

Package Information

https://launchpad.net/ubuntu/+source/linux/4.10.0-38.42
https://launchpad.net/ubuntu/+source/linux-raspi2/4.10.0-1020.23

Get the latest News and Insights

Get the latest Linux and open source security news straight to your inbox.