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USN-1756-1: Linux kernel vulnerabilities

6 March 2013

Several security issues were fixed in the kernel.

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Releases

Packages

Details

A failure to validate input was discovered in the Linux kernel's Xen
netback (network backend) driver. A user in a guest OS may exploit this
flaw to cause a denial of service to the guest OS and other guest domains.
(CVE-2013-0216)

A memory leak was discovered in the Linux kernel's Xen netback (network
backend) driver. A user in a guest OS could trigger this flaw to cause a
denial of service on the system. (CVE-2013-0217)

Andrew Jones discovered a flaw with the xen_iret function in Linux kernel's
Xen virtualizeation. In the 32-bit Xen paravirt platform an unprivileged
guest OS user could exploit this flaw to cause a denial of service (crash
the system) or gain guest OS privilege. (CVE-2013-0228)

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.
(CVE-2013-0268)

A flaw was discovered in the Linux kernel's vhost driver used to accelerate
guest networking in KVM based virtual machines. A privileged guest user
could exploit this flaw to crash the host system. (CVE-2013-0311)

An information leak was discovered in the Linux kernel's Bluetooth stack
when HIDP (Human Interface Device Protocol) support is enabled. A local
unprivileged user could exploit this flaw to cause an information leak from
the kernel. (CVE-2013-0349)

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.
(CVE-2013-1773)

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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.

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Update instructions

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

Ubuntu 11.10

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.

References

Related notices

  • USN-1767-1: linux-image-3.2.0-39-omap, linux-image-3.2.0-39-generic-pae, linux-image-3.2.0-39-virtual, linux-image-3.2.0-39-powerpc-smp, linux-image-3.2.0-39-powerpc64-smp, linux-image-3.2.0-39-highbank, linux-image-3.2.0-39-generic, linux
  • USN-1769-1: linux-image-3.5.0-26-highbank, linux-image-3.5.0-26-powerpc-smp, linux-image-3.5.0-26-powerpc64-smp, linux, linux-image-3.5.0-26-omap, linux-image-3.5.0-26-generic
  • USN-1774-1: linux-image-3.5.0-221-omap4, linux-ti-omap4
  • USN-1768-1: linux-lts-quantal, linux-image-3.5.0-26-generic
  • USN-1760-1: linux-image-3.0.0-32-virtual, linux-image-3.0.0-32-server, linux-image-3.0.0-32-generic-pae, linux-image-3.0.0-32-generic, linux-lts-backport-oneiric
  • USN-1781-1: linux-ti-omap4, linux-image-3.2.0-1427-omap4
  • USN-1796-1: linux-image-3.5.0-27-omap, linux-image-3.5.0-27-generic, linux-image-3.5.0-27-powerpc-smp, linux-image-3.5.0-27-highbank, linux-image-3.5.0-27-powerpc64-smp, linux
  • USN-1795-1: linux-image-3.5.0-27-generic, linux-lts-quantal
  • USN-1797-1: linux-image-3.5.0-222-omap4, linux-ti-omap4
  • USN-1805-1: linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-server, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-386, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-ia64, linux, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-virtual
  • USN-1808-1: linux-image-2.6.32-351-ec2, linux-ec2
  • USN-1778-1: linux-ti-omap4, linux-image-3.0.0-1222-omap4
  • USN-1776-1: linux-image-2.6.32-351-ec2, linux-ec2
  • USN-1775-1: linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-server, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-386, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-ia64, linux, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-virtual

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