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Alerts This Week
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Ubuntu 17.10 USN-3487-1 Critical: Kernel Denial of Service Threats

ubuntu
Calendar Grey November 21, 2017
Scroller Ubuntu
Multiple vulnerabilities resolved in Ubuntu kernel patches, including potential denial of service by local intruders.
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 keep track of nested levels in guest page tables. A local attacker

in a guest VM could use this to cause a denial of service (host OS crash)

or possibly execute arbitrary code in the host OS. (CVE-2017-12188)

It was discovered that on the PowerPC architecture, the kernel did not

properly sanitize the signal stack when handling sigreturn(). A local

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

possibly execute arbitrary code. (CVE-2017-1000255)

Bo Zhang discovered that the netlink wireless configuration interface in

the Linux kernel did not properly validate attributes when handling certain

requests. A local attacker with the CAP_NET_ADMIN could use this to cause a

denial of service (system crash). (CVE-2017-12153)

It was...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel local attack ubuntu system crash

Update Instructions

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

Ubuntu 17.10:
  linux-image-4.13.0-1006-raspi2  4.13.0-1006.6
  linux-image-4.13.0-17-generic   4.13.0-17.20
  linux-image-4.13.0-17-generic-lpae  4.13.0-17.20
  linux-image-4.13.0-17-lowlatency  4.13.0-17.20
  linux-image-generic             4.13.0.17.18
  linux-image-generic-lpae        4.13.0.17.18
  linux-image-lowlatency          4.13.0.17.18
  linux-image-raspi2              4.13.0.1006.4

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-3487-1

CVE-2017-1000255, CVE-2017-12153, CVE-2017-12154, CVE-2017-12188,

CVE-2017-12190, CVE-2017-12192, CVE-2017-14156, CVE-2017-14489,

CVE-2017-14954, CVE-2017-15265, CVE-2017-15537, CVE-2017-15649,

CVE-2017-16525, CVE-2017-16526, CVE-2017-16527, CVE-2017-16529,

CVE-2017-16530, CVE-2017-16531, CVE-2017-16533, CVE-2017-16534

Severity
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Critical

November 21, 2017

Topics%20covered

Topics Covered

security advisory denial of service critical kernel local attack ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/4.13.0-17.20
https://launchpad.net/ubuntu/+source/linux-raspi2/4.13.0-1006.6

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