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Ubuntu 16.04 LTS: 0032-2 Moderate Kernel Security Threats

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Calendar Grey November 23, 2017
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Kernel problems in Ubuntu resolved through updates. Understand the threats and modifications for your platform.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

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)

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 discovered that the nested KVM implementation in the Linux kernel in

some situations did not properly prevent second level guests from reading

and writing the hardware CR8 register. A local attacker in a guest could

use this to cause a denial of service (system crash). (CVE-2017-12154)

Otto Ebeling discovered that the memory m...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory Ubuntu kernel local attack system crash

Update Instructions

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

| Kernel          | Version  | flavors                  |
|-----------------+----------+--------------------------|
| 4.4.0-97.120    | 32.2     | generic, lowlatency      |
| lts-4.4.0-67.88_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-83.106_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-93.116_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |
| lts-4.4.0-97.120_14.04.1-lts-xenial | 14.04.1  | generic, lowlatency      |

Additionally, you should install an updated kernel with these fixes and
reboot at your convienience.

References

CVE-2017-10911, CVE-2017-12153, CVE-2017-12154, CVE-2017-14140

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November 23, 2017

Topics%20covered

Topics Covered

security advisory Ubuntu kernel local attack system crash

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