USN-2829-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-2829-1

4th December, 2015

linux vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 15.04

Summary

Several security issues were fixed in the kernel.

Software description

• linux - Linux kernel

Details

It was discovered that the SCTP protocol implementation in the Linux kernel
performed an incorrect sequence of protocol-initialization steps. A local
attacker could use this to cause a denial of service (system crash).
(CVE-2015-5283)

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted
to garbage collect incompletely instantiated keys. A local unprivileged
attacker could use this to cause a denial of service (system crash).
(CVE-2015-7872)

Update instructions

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

Ubuntu 15.04:

linux-image-3.19.0-39-powerpc64-emb 3.19.0-39.44

linux-image-3.19.0-39-powerpc64-smp 3.19.0-39.44

linux-image-3.19.0-39-generic 3.19.0-39.44

linux-image-3.19.0-39-powerpc-smp 3.19.0-39.44

linux-image-3.19.0-39-generic-lpae 3.19.0-39.44

linux-image-3.19.0-39-powerpc-e500mc 3.19.0-39.44

linux-image-3.19.0-39-lowlatency 3.19.0-39.44

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

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

CVE-2015-5283, CVE-2015-7872