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USN-2415-1: Linux kernel vulnerability

25 November 2014

The system could be made to deny write access to files.




Don Bailey discovered a flaw in the LZO decompress algorithm used by the
Linux kernel. An attacker could exploit this flaw to cause a denial of
service (memory corruption or OOPS). (CVE-2014-4608)

Andy Lutomirski discovered that the Linux kernel was not checking the
CAP_SYS_ADMIN when remounting filesystems to read-only. A local user could
exploit this flaw to cause a denial of service (loss of writability).

Update instructions

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

Ubuntu 10.04

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-2416-1: linux-ec2, linux-image-2.6.32-372-ec2
  • USN-2419-1: linux-image-3.13.0-40-generic-lpae, linux-image-3.13.0-40-generic, linux-lts-trusty
  • USN-2286-1: linux-lts-raring, linux-image-3.8.0-44-generic
  • USN-2421-1: linux-image-3.16.0-25-lowlatency, linux-image-3.16.0-25-powerpc-e500mc, linux-image-3.16.0-25-powerpc64-smp, linux-image-3.16.0-25-powerpc-smp, linux-image-3.16.0-25-generic-lpae, linux-image-3.16.0-25-generic, linux, linux-image-3.16.0-25-powerpc64-emb
  • USN-2417-1: linux-image-3.2.0-72-powerpc64-smp, linux-image-3.2.0-72-powerpc-smp, linux-image-3.2.0-72-generic-pae, linux-image-3.2.0-72-virtual, linux-image-3.2.0-72-highbank, linux-image-3.2.0-72-generic, linux, linux-image-3.2.0-72-omap
  • USN-2289-1: linux-image-3.11.0-26-generic-lpae, linux, linux-image-3.11.0-26-generic
  • USN-2420-1: linux-image-3.13.0-40-powerpc-e500, linux-image-3.13.0-40-lowlatency, linux, linux-image-3.13.0-40-generic, linux-image-3.13.0-40-powerpc-e500mc, linux-image-3.13.0-40-powerpc64-smp, linux-image-3.13.0-40-generic-lpae, linux-image-extra-3.13.0-40-generic, linux-image-3.13.0-40-powerpc64-emb, linux-image-3.13.0-40-powerpc-smp
  • USN-2418-1: linux-image-3.2.0-1456-omap4, linux-ti-omap4