USN-3377-1: Linux kernel vulnerabilities

Ubuntu Security Notice USN-3377-1

3rd August, 2017

linux, linux-raspi2 vulnerabilities

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

  • Ubuntu 17.04

Summary

Several security issues were fixed in the Linux kernel.

Software description

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

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 version:

Ubuntu 17.04:
linux-image-generic 4.10.0.30.31
linux-image-lowlatency 4.10.0.30.31
linux-image-generic-lpae 4.10.0.30.31
linux-image-4.10.0-30-generic 4.10.0-30.34
linux-image-4.10.0-30-generic-lpae 4.10.0-30.34
linux-image-4.10.0-1013-raspi2 4.10.0-1013.16
linux-image-4.10.0-30-lowlatency 4.10.0-30.34
linux-image-raspi2 4.10.0.1013.15

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.
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