USN-3378-1: Linux kernel vulnerabilities

Releases

• Ubuntu 16.04 ESM

Packages

• linux - Linux kernel
• linux-aws - Linux kernel for Amazon Web Services (AWS) systems
• linux-gke - Linux kernel for Google Container Engine (GKE) systems
• linux-raspi2 - Linux kernel for Raspberry Pi 2
• linux-snapdragon - Linux kernel for Snapdragon processors

Details

Fan Wu and Shixiong Zhao discovered a race condition between inotify events
and vfs rename operations in the Linux kernel. An unprivileged local
attacker could use this to cause a denial of service (system crash) or
execute arbitrary code. (CVE-2017-7533)

It was discovered that the Linux kernel did not properly restrict
RLIMIT_STACK size. A local attacker could use this in conjunction with
another vulnerability to possibly execute arbitrary code.
(CVE-2017-1000365)

李强 discovered that the Virtio GPU driver in the Linux kernel did not
properly free memory in some situations. A local attacker could use this to
cause a denial of service (memory consumption). (CVE-2017-10810)

石磊 discovered that the RxRPC Kerberos 5 ticket handling code in the
Linux kernel did not properly verify metadata. A remote attacker could use
this to cause a denial of service (system crash) or possibly execute
arbitrary code. (CVE-2017-7482)

Update instructions

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

Ubuntu 16.04

• linux-image-4.4.0-1024-gke - 4.4.0-1024.24
• linux-image-4.4.0-1028-aws - 4.4.0-1028.37
• linux-image-4.4.0-1067-raspi2 - 4.4.0-1067.75
• linux-image-4.4.0-1069-snapdragon - 4.4.0-1069.74
• linux-image-4.4.0-89-generic - 4.4.0-89.112
• linux-image-4.4.0-89-generic-lpae - 4.4.0-89.112
• linux-image-4.4.0-89-lowlatency - 4.4.0-89.112
• linux-image-4.4.0-89-powerpc-e500mc - 4.4.0-89.112
• linux-image-4.4.0-89-powerpc-smp - 4.4.0-89.112
• linux-image-4.4.0-89-powerpc64-emb - 4.4.0-89.112
• linux-image-4.4.0-89-powerpc64-smp - 4.4.0-89.112

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-2017-1000365
• CVE-2017-10810
• CVE-2017-7482
• CVE-2017-7533

Related notices

• USN-3377-2: linux-image-4.10.0-30-lowlatency, linux-image-4.10.0-30-generic, linux-image-4.10.0-30-generic-lpae, linux-image-extra-4.10.0-30-generic, linux-hwe
• USN-3377-1: linux-image-generic, linux-image-4.10.0-30-lowlatency, linux, linux-image-generic-lpae, linux-image-4.10.0-30-generic, linux-image-4.10.0-30-generic-lpae, linux-image-lowlatency, linux-image-raspi2, linux-image-4.10.0-1013-raspi2, linux-raspi2
• USN-3381-1: linux-image-3.13.0-126-powerpc-e500, linux, linux-image-3.13.0-126-powerpc-e500mc, linux-image-extra-3.13.0-126-generic, linux-image-3.13.0-126-generic, linux-image-3.13.0-126-lowlatency, linux-image-3.13.0-126-generic-lpae, linux-image-3.13.0-126-powerpc64-smp, linux-image-3.13.0-126-powerpc64-emb, linux-image-3.13.0-126-powerpc-smp
• USN-3378-2: linux-image-4.4.0-89-powerpc-e500mc, linux-lts-xenial, linux-image-4.4.0-89-powerpc-smp, linux-image-4.4.0-89-powerpc64-emb, linux-image-4.4.0-89-powerpc64-smp, linux-image-4.4.0-89-generic-lpae, linux-image-extra-4.4.0-89-generic, linux-image-4.4.0-89-generic, linux-image-4.4.0-89-lowlatency
• USN-3381-2: linux-lts-trusty, linux-image-3.13.0-126-generic, linux-image-3.13.0-126-generic-lpae, linux-image-generic-lpae-lts-trusty, linux-image-generic-lts-trusty