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USN-1775-1: Linux kernel vulnerabilities

22 March 2013

Several security issues were fixed in the kernel.

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A flaw was reported in the permission checks done by the Linux kernel for
/dev/cpu/*/msr. A local root user with all capabilities dropped could
exploit this flaw to execute code with full root capabilities.

A flaw was discovered in the Linux kernels handling of memory ranges with
PROT_NONE when transparent hugepages are in use. An unprivileged local user
could exploit this flaw to cause a denial of service (crash the system).

A flaw was discovered on the Linux kernel's VFAT filesystem driver when a
disk is mounted with the utf8 option (this is the default on Ubuntu). On a
system where disks/images can be auto-mounted or a FAT filesystem is
mounted an unprivileged user can exploit the flaw to gain root privileges.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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-1767-1: linux-image-3.2.0-39-generic, linux, linux-image-3.2.0-39-powerpc-smp, linux-image-3.2.0-39-virtual, linux-image-3.2.0-39-generic-pae, linux-image-3.2.0-39-highbank, linux-image-3.2.0-39-omap, linux-image-3.2.0-39-powerpc64-smp
  • USN-1781-1: linux-image-3.2.0-1427-omap4, linux-ti-omap4
  • USN-1769-1: linux-image-3.5.0-26-powerpc64-smp, linux, linux-image-3.5.0-26-highbank, linux-image-3.5.0-26-powerpc-smp, linux-image-3.5.0-26-generic, linux-image-3.5.0-26-omap
  • USN-1776-1: linux-ec2, linux-image-2.6.32-351-ec2
  • USN-1774-1: linux-ti-omap4, linux-image-3.5.0-221-omap4
  • USN-1756-1: linux, linux-image-3.0.0-32-server, linux-image-3.0.0-32-powerpc, linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-omap, linux-image-3.0.0-32-powerpc-smp, linux-image-3.0.0-32-powerpc64-smp, linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-generic
  • USN-1768-1: linux-image-3.5.0-26-generic, linux-lts-quantal
  • USN-1760-1: linux-image-3.0.0-32-server, linux-image-3.0.0-32-virtual, linux-lts-backport-oneiric, linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-generic
  • USN-1778-1: linux-image-3.0.0-1222-omap4, linux-ti-omap4
  • USN-1648-1: linux-image-3.0.0-28-powerpc-smp, linux-image-3.0.0-28-server, linux-image-3.0.0-28-generic, linux-image-3.0.0-28-powerpc, linux, linux-image-3.0.0-28-generic-pae, linux-image-3.0.0-28-powerpc64-smp, linux-image-3.0.0-28-omap, linux-image-3.0.0-28-virtual
  • USN-1644-1: linux-image-3.2.0-34-virtual, linux, linux-image-3.2.0-34-generic-pae, linux-image-3.2.0-34-generic, linux-image-3.2.0-34-powerpc-smp, linux-image-3.2.0-34-omap, linux-image-3.2.0-34-highbank, linux-image-3.2.0-34-powerpc64-smp
  • USN-1649-1: linux-ti-omap4, linux-image-3.0.0-1218-omap4
  • USN-1645-1: linux-image-3.2.0-1422-omap4, linux-ti-omap4
  • USN-1646-1: linux-image-3.5.0-19-generic, linux-image-3.5.0-19-omap, linux, linux-image-3.5.0-19-powerpc-smp, linux-image-3.5.0-19-highbank, linux-image-3.5.0-19-powerpc64-smp
  • USN-1647-1: linux-ti-omap4, linux-image-3.5.0-215-omap4
  • USN-1652-1: linux-image-3.0.0-28-server, linux-image-3.0.0-28-generic, linux-image-3.0.0-28-generic-pae, linux-lts-backport-oneiric, linux-image-3.0.0-28-virtual