USN-2777-1: Linux kernel (Utopic HWE) vulnerabilities

Releases

• Ubuntu 14.04 ESM

Packages

• linux-lts-utopic - Linux hardware enablement kernel from Utopic

Details

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)

Benjamin Randazzo discovered an information leak in the md (multiple
device) driver when the bitmap_info.file is disabled. A local privileged
attacker could use this to obtain sensitive information from the kernel.
(CVE-2015-5697)

Marc-André Lureau discovered that the vhost driver did not properly
release the userspace provided log file descriptor. A privileged attacker
could use this to cause a denial of service (resource exhaustion).
(CVE-2015-6252)

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 service (system crash).
(CVE-2015-6937)

Ben Hutchings discovered that the Advanced Union Filesystem (aufs) for the
Linux kernel did not correctly handle references of memory mapped files
from an aufs mount. A local attacker could use this to cause a denial of
service (system crash) or possibly execute arbitrary code with
administrative privileges. (CVE-2015-7312)

Update instructions

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

Ubuntu 14.04

• linux-image-3.16.0-51-generic - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-generic-lpae - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-lowlatency - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-powerpc-e500mc - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-powerpc-smp - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-powerpc64-emb - 3.16.0-51.69~14.04.1
• linux-image-3.16.0-51-powerpc64-smp - 3.16.0-51.69~14.04.1

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-2015-5156
• CVE-2015-5697
• CVE-2015-6252
• CVE-2015-6937
• CVE-2015-7312

Related notices

• USN-2773-1: linux-image-3.2.0-92-powerpc64-smp, linux-image-3.2.0-92-highbank, linux, linux-image-3.2.0-92-virtual, linux-image-3.2.0-92-generic, linux-image-3.2.0-92-generic-pae, linux-image-3.2.0-92-omap, linux-image-3.2.0-92-powerpc-smp
• USN-2776-1: linux, linux-image-3.13.0-66-powerpc64-emb, linux-image-3.13.0-66-generic-lpae, linux-image-3.13.0-66-powerpc-e500, linux-image-3.13.0-66-powerpc-e500mc, linux-image-3.13.0-66-powerpc-smp, linux-image-3.13.0-66-generic, linux-image-3.13.0-66-powerpc64-smp, linux-image-extra-3.13.0-66-generic, linux-image-3.13.0-66-lowlatency
• USN-2779-1: linux-image-3.19.0-31-generic-lpae, linux-image-3.19.0-31-powerpc64-smp, linux-image-3.19.0-31-generic, linux, linux-image-3.19.0-31-powerpc-smp, linux-image-3.19.0-31-powerpc-e500mc, linux-image-3.19.0-31-lowlatency, linux-image-3.19.0-31-powerpc64-emb
• USN-2778-1: linux-image-3.19.0-31-generic-lpae, linux-image-3.19.0-31-powerpc64-smp, linux-image-3.19.0-31-generic, linux-image-extra-3.19.0-31-generic, linux-lts-vivid, linux-image-3.19.0-31-powerpc-smp, linux-image-3.19.0-31-powerpc-e500mc, linux-image-3.19.0-31-lowlatency, linux-image-3.19.0-31-powerpc64-emb
• USN-2775-1: linux-lts-trusty, linux-image-3.13.0-66-generic, linux-image-3.13.0-66-generic-lpae
• USN-2774-1: linux-ti-omap4, linux-image-3.2.0-1472-omap4
• USN-2732-1: linux-ti-omap4, linux-image-3.2.0-1470-omap4
• USN-2748-1: linux, linux-image-3.13.0-65-powerpc64-emb, linux-image-3.13.0-65-generic, linux-image-3.13.0-65-powerpc-e500, linux-image-3.13.0-65-powerpc-e500mc, linux-image-3.13.0-65-powerpc-smp, linux-image-3.13.0-65-generic-lpae, linux-image-3.13.0-65-powerpc64-smp, linux-image-3.13.0-65-lowlatency, linux-image-extra-3.13.0-65-generic
• USN-2751-1: linux-image-extra-3.19.0-30-generic, linux-image-3.19.0-30-generic-lpae, linux-image-3.19.0-30-powerpc64-smp, linux-image-3.19.0-30-powerpc-e500mc, linux-lts-vivid, linux-image-3.19.0-30-powerpc-smp, linux-image-3.19.0-30-powerpc64-emb, linux-image-3.19.0-30-generic, linux-image-3.19.0-30-lowlatency
• USN-2749-1: linux-lts-trusty, linux-image-3.13.0-65-generic, linux-image-3.13.0-65-generic-lpae
• USN-2731-1: linux-image-3.2.0-90-highbank, linux-image-3.2.0-90-generic-pae, linux, linux-image-3.2.0-90-generic, linux-image-3.2.0-90-virtual, linux-image-3.2.0-90-omap, linux-image-3.2.0-90-powerpc-smp, linux-image-3.2.0-90-powerpc64-smp
• USN-2752-1: linux, linux-image-3.19.0-30-generic-lpae, linux-image-3.19.0-30-powerpc64-smp, linux-image-3.19.0-30-powerpc-e500mc, linux-image-3.19.0-30-powerpc-smp, linux-image-3.19.0-30-powerpc64-emb, linux-image-3.19.0-30-generic, linux-image-3.19.0-30-lowlatency
• USN-2759-1: linux-image-3.2.0-91-powerpc-smp, linux-image-3.2.0-91-powerpc64-smp, linux-image-3.2.0-91-virtual, linux, linux-image-3.2.0-91-highbank, linux-image-3.2.0-91-omap, linux-image-3.2.0-91-generic, linux-image-3.2.0-91-generic-pae
• USN-2760-1: linux-ti-omap4, linux-image-3.2.0-1471-omap4