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Ubuntu 15.10 USN-2890-3 Critical: Kernel Denial Of Service Issues

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Calendar Grey February 2, 2016
Scroller Ubuntu
=========================================================================Ubuntu Security Notice USN-
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-raspi2: Linux kernel for Raspberry Pi 2

Details:

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

AF_UNIX implementation in the Linux kernel. A local attacker could use

crafted epoll_ctl calls to cause a denial of service (system crash) or

expose sensitive information. (CVE-2013-7446)

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

properly restore the values of the Programmable Interrupt Timer (PIT). A

user-assisted attacker in a KVM guest could cause a denial of service in

the host (system crash). (CVE-2015-7513)

It was discovered that the Linux kernel keyring subsystem contained a race

between read and revoke operations. A local attacker could use this to

cause a denial of service (system crash). (CVE-2015-7550)

Sasha Levin discovered that the Reliable Datagram Sockets (RDS)

implementation in the Linux kernel had a race condit...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel raspberry pi linux-raspi2

Update Instructions

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

Ubuntu 15.10:
  linux-image-4.2.0-1022-raspi2   4.2.0-1022.29

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-2890-3

https://ubuntu.com/security/notices/USN-2890-1

CVE-2013-7446, CVE-2015-7513, CVE-2015-7550, CVE-2015-7990,

CVE-2015-8374, CVE-2015-8543, CVE-2015-8569, CVE-2015-8575,

CVE-2015-8787

Severity
critical
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Critical

February 02, 2016

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu kernel raspberry pi linux-raspi2

Package Information

https://launchpad.net/ubuntu/+source/linux-raspi2/4.2.0-1022.29

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