USN-3443-1: Linux kernel vulnerabilities

Releases

• Ubuntu 17.04

Packages

• linux - Linux kernel
• linux-raspi2 - Linux kernel for Raspberry Pi 2

Details

It was discovered that on the PowerPC architecture, the kernel did not
properly sanitize the signal stack when handling sigreturn(). A local
attacker could use this to cause a denial of service (system crash) or
possibly execute arbitrary code. (CVE-2017-1000255)

Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
stack implementation in the Linux kernel. A local attacker could use this
to cause a denial of service (system crash). (CVE-2017-14106)

Update instructions

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

Ubuntu 17.04

• linux-image-powerpc-smp - 4.10.0.37.37
• linux-image-powerpc-e500mc - 4.10.0.37.37
• linux-image-4.10.0-37-lowlatency - 4.10.0-37.41
• linux-image-generic-lpae - 4.10.0.37.37
• linux-image-lowlatency - 4.10.0.37.37
• linux-image-virtual - 4.10.0.37.37
• linux-image-4.10.0-1019-raspi2 - 4.10.0-1019.22
• linux-image-powerpc64-smp - 4.10.0.37.37
• linux-image-generic - 4.10.0.37.37
• linux-image-4.10.0-37-generic-lpae - 4.10.0-37.41
• linux-image-4.10.0-37-generic - 4.10.0-37.41
• linux-image-powerpc64-emb - 4.10.0.37.37
• linux-image-raspi2 - 4.10.0.1019.20

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

• CVE-2017-1000255
• CVE-2017-14106

Related notices

• USN-3487-1: linux-image-generic, linux-image-4.13.0-17-generic-lpae, linux-image-generic-lpae, linux-image-lowlatency, linux-image-4.13.0-1006-raspi2, linux-raspi2, linux, linux-image-4.13.0-17-generic, linux-image-4.13.0-17-lowlatency, linux-image-raspi2
• USN-3443-2: linux-hwe, linux-image-4.10.0-37-generic-lpae, linux-image-extra-4.10.0-37-generic, linux-image-4.10.0-37-generic, linux-image-4.10.0-37-lowlatency
• USN-3443-3: linux-gcp, linux-image-4.10.0-1007-gcp, linux-image-extra-4.10.0-1007-gcp
• USN-3444-2: linux-image-extra-4.4.0-97-generic, linux-image-4.4.0-97-powerpc64-smp, linux-image-4.4.0-97-powerpc64-emb, linux-lts-xenial, linux-image-4.4.0-97-generic, linux-image-4.4.0-97-lowlatency, linux-image-4.4.0-97-powerpc-e500mc, linux-image-4.4.0-97-powerpc-smp, linux-image-4.4.0-97-generic-lpae
• USN-3444-1: linux-image-4.4.0-1075-raspi2, linux-gke, linux-aws, linux-image-4.4.0-1032-gke, linux-image-4.4.0-97-generic, linux-image-4.4.0-1077-snapdragon, linux-kvm, linux-image-4.4.0-97-powerpc-smp, linux-raspi2, linux, linux-image-4.4.0-1008-kvm, linux-image-4.4.0-97-generic-lpae, linux-image-4.4.0-97-powerpc64-smp, linux-image-4.4.0-97-powerpc64-emb, linux-image-4.4.0-1038-aws, linux-snapdragon, linux-image-extra-4.4.0-97-generic, linux-image-4.4.0-97-lowlatency, linux-image-4.4.0-97-powerpc-e500mc, linux-image-extra-4.4.0-1032-gke
• USN-3445-1: linux-image-extra-3.13.0-133-generic, linux-image-3.13.0-133-powerpc-smp, linux-image-3.13.0-133-generic-lpae, linux-image-3.13.0-133-powerpc-e500mc, linux-image-3.13.0-133-powerpc64-emb, linux-image-3.13.0-133-powerpc64-smp, linux-image-3.13.0-133-lowlatency, linux-image-3.13.0-133-powerpc-e500, linux, linux-image-3.13.0-133-generic
• USN-3445-2: linux-image-3.13.0-133-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty, linux-lts-trusty, linux-image-3.13.0-133-generic