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USN-2635-1: Linux kernel (Utopic HWE) vulnerabilities

10 June 2015

Several security issues were fixed in the kernel.




Xiong Zhou discovered a bug in the way the EXT4 filesystem handles
fallocate zero range functionality when the page size is greater than the
block size. A local attacker could exploit this flaw to cause a denial of
service (system crash). (CVE-2015-0275)

Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping
support. A local user could exploit this flaw to cause a denial of service
(system crash) or gain administrative privileges on the system.

Update instructions

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

Ubuntu 14.04

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.

Related notices

  • USN-2637-1: linux-image-3.16.0-39-powerpc64-emb, linux-image-3.16.0-39-generic, linux-image-3.16.0-39-lowlatency, linux-image-3.16.0-39-generic-lpae, linux-image-3.16.0-39-powerpc64-smp, linux, linux-image-3.16.0-39-powerpc-smp, linux-image-3.16.0-39-powerpc-e500mc
  • USN-2636-1: linux-lts-vivid, linux-image-3.19.0-20-powerpc64-emb, linux-image-3.19.0-20-lowlatency, linux-image-3.19.0-20-generic-lpae, linux-image-3.19.0-20-generic, linux-image-extra-3.19.0-20-generic, linux-image-3.19.0-20-powerpc-smp, linux-image-3.19.0-20-powerpc-e500mc, linux-image-3.19.0-20-powerpc64-smp
  • USN-2638-1: linux-image-3.19.0-20-powerpc64-emb, linux-image-3.19.0-20-lowlatency, linux-image-3.19.0-20-generic-lpae, linux-image-3.19.0-20-generic, linux-image-3.19.0-20-powerpc-smp, linux, linux-image-3.19.0-20-powerpc-e500mc, linux-image-3.19.0-20-powerpc64-smp
  • USN-2633-1: linux-lts-trusty, linux-image-3.13.0-54-generic-lpae, linux-image-3.13.0-54-generic
  • USN-2634-1: linux-image-extra-3.13.0-54-generic, linux-image-3.13.0-54-generic, linux-image-3.13.0-54-powerpc64-emb, linux-image-3.13.0-54-lowlatency, linux-image-3.13.0-54-powerpc-e500mc, linux, linux-image-3.13.0-54-generic-lpae, linux-image-3.13.0-54-powerpc-e500, linux-image-3.13.0-54-powerpc-smp, linux-image-3.13.0-54-powerpc64-smp
  • USN-2631-1: linux-image-3.2.0-85-highbank, linux-image-3.2.0-85-powerpc64-smp, linux-image-3.2.0-85-omap, linux-image-3.2.0-85-virtual, linux-image-3.2.0-85-generic, linux-image-3.2.0-85-powerpc-smp, linux-image-3.2.0-85-generic-pae, linux
  • USN-2632-1: linux-image-3.2.0-1465-omap4, linux-ti-omap4