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Ubuntu 15.04 USN-2779-1 Critical: Kernel Denial Of Service Issues

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Calendar Grey October 20, 2015
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Multiple security vulnerabilities in the Linux kernel addressed in Ubuntu 15.04. Comprehensive update notes and guidance available. Take action immediately!
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

It was discovered that the Linux kernel did not check if a new IPv6 MTU set

by a user space application was valid. A remote attacker could forge a

route advertisement with an invalid MTU that a user space daemon like

NetworkManager would honor and apply to the kernel, causing a denial of

service. (CVE-2015-0272)

It was discovered that virtio networking in the Linux kernel did not handle

fragments correctly, leading to kernel memory corruption. A remote attacker

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

execute code with administrative privileges. (CVE-2015-5156)

It was discovered that the Reliable Datagram Sockets (RDS) implementation

in the Linux kernel did not verify sockets were properly bound before

attempting to send a message, which could cause a NULL pointer dereference.

An attacker could use this to cause a denial of ...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service software update Ubuntu kernel system crash Linux

Update Instructions

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

Ubuntu 15.04:
  linux-image-3.19.0-31-generic   3.19.0-31.36
  linux-image-3.19.0-31-generic-lpae  3.19.0-31.36
  linux-image-3.19.0-31-lowlatency  3.19.0-31.36
  linux-image-3.19.0-31-powerpc-e500mc  3.19.0-31.36
  linux-image-3.19.0-31-powerpc-smp  3.19.0-31.36
  linux-image-3.19.0-31-powerpc64-emb  3.19.0-31.36
  linux-image-3.19.0-31-powerpc64-smp  3.19.0-31.36

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. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References

https://ubuntu.com/security/notices/USN-2779-1

CVE-2015-0272, CVE-2015-5156, CVE-2015-6937, CVE-2015-7312

Severity
critical
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Low
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Critical

October 20, 2015

Topics%20covered

Topics Covered

security advisory denial of service software update Ubuntu kernel system crash Linux

Package Information

https://launchpad.net/ubuntu/+source/linux/3.19.0-31.36

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