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USN-1529-1: Linux kernel vulnerabilities

10 August 2012

Several security issues were fixed in the kernel.

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Details

A flaw was discovered in the Linux kernel's macvtap device driver, which is
used in KVM (Kernel-based Virtual Machine) to create a network bridge
between host and guest. A privleged user in a guest could exploit this flaw
to crash the host, if the vhost_net module is loaded with the
experimental_zcopytx option enabled. (CVE-2012-2119)

An error was discovered in the Linux kernel's network TUN/TAP device
implementation. A local user with access to the TUN/TAP interface (which is
not available to unprivileged users until granted by a root user) could
exploit this flaw to crash the system or potential gain administrative
privileges. (CVE-2012-2136)

A flaw was found in how the Linux kernel's KVM (Kernel-based Virtual
Machine) subsystem handled MSI (Message Signaled Interrupts). A local
unprivileged user could exploit this flaw to cause a denial of service or
potentially elevate privileges. (CVE-2012-2137)

A flaw was found in the Linux kernel's Reliable Datagram Sockets (RDS)
protocol implementation. A local, unprivileged user could use this flaw to
cause a denial of service. (CVE-2012-2372)

Ulrich Obergfell discovered an error in the Linux kernel's memory
management subsystem on 32 bit PAE systems with more than 4GB of memory
installed. A local unprivileged user could exploit this flaw to crash the
system. (CVE-2012-2373)

It was discovered that hypervkvpd, which is distributed in the Linux
kernel, was not correctly validating the origin on Netlink messages. An
untrusted local user can cause a denial of service of Linux guests in
Hyper-V virtualization environments. (CVE-2012-2669)

Dan Rosenberg discovered flaws in the Linux kernel's NCI (Near Field
Communication Controller Interface). A remote attacker could exploit these
flaws to crash the system or potentially execute privileged code.
(CVE-2012-3364)

A flaw was discovered in the Linux kernel's epoll system call. An
unprivileged local user could use this flaw to crash the system.
(CVE-2012-3375)

Some errors where discovered in the Linux kernel's UDF file system, which
is used to mount some CD-ROMs and DVDs. An unprivileged local user could
use these flaws to crash the system. (CVE-2012-3400)

A flaw was discovered in the madvise feature of the Linux kernel's memory
subsystem. An unprivileged local use could exploit the flaw to cause a
denial of service (crash the system). (CVE-2012-3511)

Denys Fedoryshchenko discovered a flaw in the Linux kernel's TCP receive
processing for IPv4. A remote attacker could exploit this flaw to cause a
denial of service (kernel resource consumption) via a flood of SYN+FIN TCP
packets. (CVE-2012-6638)

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.

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Update instructions

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

Ubuntu 12.04

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.

References

Related notices

  • USN-1514-1: linux-image-3.2.0-1417-omap4, linux-ti-omap4
  • USN-1531-1: linux, linux-image-2.6.38-15-versatile, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-omap, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-powerpc64-smp, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-powerpc
  • USN-1533-1: linux, linux-image-3.0.0-24-powerpc-smp, linux-image-3.0.0-24-virtual, linux-image-3.0.0-24-omap, linux-image-3.0.0-24-server, linux-image-3.0.0-24-generic-pae, linux-image-3.0.0-24-powerpc64-smp, linux-image-3.0.0-24-generic, linux-image-3.0.0-24-powerpc
  • USN-1539-1: linux-lts-backport-oneiric, linux-image-3.0.0-24-virtual, linux-image-3.0.0-24-server, linux-image-3.0.0-24-generic-pae, linux-image-3.0.0-24-generic
  • USN-1535-1: linux, linux-image-2.6.32-42-ia64, linux-image-2.6.32-42-powerpc-smp, linux-image-2.6.32-42-sparc64, linux-image-2.6.32-42-virtual, linux-image-2.6.32-42-powerpc64-smp, linux-image-2.6.32-42-preempt, linux-image-2.6.32-42-386, linux-image-2.6.32-42-generic, linux-image-2.6.32-42-generic-pae, linux-image-2.6.32-42-lpia, linux-image-2.6.32-42-versatile, linux-image-2.6.32-42-server, linux-image-2.6.32-42-powerpc, linux-image-2.6.32-42-sparc64-smp
  • USN-1534-1: linux-image-2.6.32-347-ec2, linux-ec2
  • USN-1598-1: linux-image-2.6.24-32-hppa64, linux-image-2.6.24-32-rt, linux-image-2.6.24-32-sparc64-smp, linux-image-2.6.24-32-openvz, linux-image-2.6.24-32-lpiacompat, linux-image-2.6.24-32-itanium, linux-image-2.6.24-32-powerpc, linux-image-2.6.24-32-virtual, linux, linux-image-2.6.24-32-sparc64, linux-image-2.6.24-32-mckinley, linux-image-2.6.24-32-powerpc64-smp, linux-image-2.6.24-32-lpia, linux-image-2.6.24-32-server, linux-image-2.6.24-32-xen, linux-image-2.6.24-32-powerpc-smp, linux-image-2.6.24-32-hppa32, linux-image-2.6.24-32-generic, linux-image-2.6.24-32-386
  • USN-1532-1: linux-image-3.0.0-1214-omap4, linux-ti-omap4
  • USN-1538-1: linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic
  • USN-1530-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
  • USN-1607-1: linux, linux-image-3.0.0-26-powerpc64-smp, linux-image-3.0.0-26-server, linux-image-3.0.0-26-virtual, linux-image-3.0.0-26-omap, linux-image-3.0.0-26-generic, linux-image-3.0.0-26-generic-pae, linux-image-3.0.0-26-powerpc, linux-image-3.0.0-26-powerpc-smp
  • USN-1606-1: linux, linux-image-2.6.32-44-ia64, linux-image-2.6.32-44-server, linux-image-2.6.32-44-versatile, linux-image-2.6.32-44-generic, linux-image-2.6.32-44-powerpc-smp, linux-image-2.6.32-44-generic-pae, linux-image-2.6.32-44-386, linux-image-2.6.32-44-lpia, linux-image-2.6.32-44-powerpc, linux-image-2.6.32-44-preempt, linux-image-2.6.32-44-virtual, linux-image-2.6.32-44-powerpc64-smp, linux-image-2.6.32-44-sparc64, linux-image-2.6.32-44-sparc64-smp
  • USN-1594-1: linux-lts-backport-oneiric, linux-image-3.0.0-26-server, linux-image-3.0.0-26-virtual, linux-image-3.0.0-26-generic, linux-image-3.0.0-26-generic-pae
  • USN-1609-1: linux-ti-omap4, linux-image-3.0.0-1216-omap4
  • USN-1554-1: linux, linux-image-3.0.0-25-virtual, linux-image-3.0.0-25-powerpc64-smp, linux-image-3.0.0-25-powerpc, linux-image-3.0.0-25-omap, linux-image-3.0.0-25-server, linux-image-3.0.0-25-generic-pae, linux-image-3.0.0-25-generic, linux-image-3.0.0-25-powerpc-smp
  • USN-1556-1: linux-image-2.6.32-347-ec2, linux-ec2
  • USN-1558-1: linux-image-3.0.0-1215-omap4, linux-ti-omap4
  • USN-1563-1: linux-lts-backport-oneiric, linux-image-3.0.0-25-virtual, linux-image-3.0.0-25-server, linux-image-3.0.0-25-generic-pae, linux-image-3.0.0-25-generic
  • USN-1555-1: linux, linux-image-2.6.32-42-ia64, linux-image-2.6.32-42-powerpc-smp, linux-image-2.6.32-42-sparc64, linux-image-2.6.32-42-virtual, linux-image-2.6.32-42-powerpc64-smp, linux-image-2.6.32-42-preempt, linux-image-2.6.32-42-386, linux-image-2.6.32-42-generic, linux-image-2.6.32-42-generic-pae, linux-image-2.6.32-42-lpia, linux-image-2.6.32-42-versatile, linux-image-2.6.32-42-server, linux-image-2.6.32-42-powerpc, linux-image-2.6.32-42-sparc64-smp
  • USN-1719-1: linux-lts-backport-oneiric, linux-image-3.0.0-31-server, linux-image-3.0.0-31-generic-pae, linux-image-3.0.0-31-virtual, linux-image-3.0.0-31-generic
  • USN-1720-1: linux, linux-image-3.0.0-31-powerpc64-smp, linux-image-3.0.0-31-powerpc, linux-image-3.0.0-31-powerpc-smp, linux-image-3.0.0-31-server, linux-image-3.0.0-31-generic-pae, linux-image-3.0.0-31-virtual, linux-image-3.0.0-31-omap, linux-image-3.0.0-31-generic
  • USN-1726-1: linux-ti-omap4, linux-image-3.0.0-1221-omap4
  • USN-1562-1: linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-generic-pae, linux-lts-backport-natty, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic
  • USN-1557-1: linux, linux-image-2.6.38-15-versatile, linux-image-2.6.38-15-virtual, linux-image-2.6.38-15-omap, linux-image-2.6.38-15-generic-pae, linux-image-2.6.38-15-powerpc64-smp, linux-image-2.6.38-15-powerpc-smp, linux-image-2.6.38-15-server, linux-image-2.6.38-15-generic, linux-image-2.6.38-15-powerpc
  • USN-1574-1: linux-image-2.6.38-16-generic-pae, linux-image-2.6.38-16-server, linux-lts-backport-natty, linux-image-2.6.38-16-generic, linux-image-2.6.38-16-virtual
  • USN-1572-1: linux, linux-image-2.6.32-43-lpia, linux-image-2.6.32-43-powerpc, linux-image-2.6.32-43-generic, linux-image-2.6.32-43-generic-pae, linux-image-2.6.32-43-sparc64-smp, linux-image-2.6.32-43-server, linux-image-2.6.32-43-preempt, linux-image-2.6.32-43-sparc64, linux-image-2.6.32-43-virtual, linux-image-2.6.32-43-ia64, linux-image-2.6.32-43-versatile, linux-image-2.6.32-43-386, linux-image-2.6.32-43-powerpc64-smp, linux-image-2.6.32-43-powerpc-smp
  • USN-1577-1: linux-image-2.6.38-1209-omap4, linux-ti-omap4
  • USN-1573-1: linux-image-2.6.32-348-ec2, linux-ec2
  • USN-1567-1: linux, linux-image-2.6.38-16-omap, linux-image-2.6.38-16-powerpc, linux-image-2.6.38-16-generic-pae, linux-image-2.6.38-16-powerpc-smp, linux-image-2.6.38-16-server, linux-image-2.6.38-16-powerpc64-smp, linux-image-2.6.38-16-generic, linux-image-2.6.38-16-versatile, linux-image-2.6.38-16-virtual
  • USN-1653-1: linux-image-2.6.32-350-ec2, linux-ec2
  • USN-1651-1: linux, linux-image-2.6.32-45-386, linux-image-2.6.32-45-preempt, linux-image-2.6.32-45-powerpc, linux-image-2.6.32-45-lpia, linux-image-2.6.32-45-versatile, linux-image-2.6.32-45-powerpc-smp, linux-image-2.6.32-45-sparc64-smp, linux-image-2.6.32-45-server, linux-image-2.6.32-45-sparc64, linux-image-2.6.32-45-generic, linux-image-2.6.32-45-virtual, linux-image-2.6.32-45-powerpc64-smp, linux-image-2.6.32-45-generic-pae, linux-image-2.6.32-45-ia64

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