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USN-1646-1: Linux kernel vulnerabilities

30 November 2012

Several security issues were fixed in the kernel.

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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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Releases

Packages

Details

Brad Spengler discovered a flaw in the Linux kernel's uname system call. An
unprivileged user could exploit this flaw to read kernel stack memory.
(CVE-2012-0957)

Rodrigo Freire discovered a flaw in the Linux kernel's TCP illinois
congestion control algorithm. A local attacker could use this to cause a
denial of service. (CVE-2012-4565)

Mathias Krause discovered a flaw in the Linux kernel's XFRM netlink
interface. A local user with the NET_ADMIN capability could exploit this
flaw to leak the contents of kernel memory. (CVE-2012-6536)

Mathias Krause discovered several errors in the Linux kernel's xfrm_user
implementation. A local attacker could exploit these flaws to examine parts
of kernel memory. (CVE-2012-6537)

Mathias Krause discovered an information leak in the Linux kernel's
xfrm_user copy_to_user_auth function. A local user could exploit this flaw
to examine parts of kernel heap memory. (CVE-2012-6538)

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).
(CVE-2013-0309)

Mathias Krause discovered a flaw in xfrm_user in the Linux kernel. A local
attacker with NET_ADMIN capability could potentially exploit this flaw to
escalate privileges. (CVE-2013-1826)

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 12.10

After a standard system update you need to reboot your computer to make
all the necessary changes.

Related notices

  • USN-1648-1: linux-image-3.0.0-28-server, linux-image-3.0.0-28-virtual, linux-image-3.0.0-28-powerpc, linux-image-3.0.0-28-generic, linux-image-3.0.0-28-powerpc64-smp, linux, linux-image-3.0.0-28-omap, linux-image-3.0.0-28-generic-pae, linux-image-3.0.0-28-powerpc-smp
  • USN-1644-1: linux-image-3.2.0-34-highbank, linux-image-3.2.0-34-powerpc-smp, linux-image-3.2.0-34-virtual, linux, linux-image-3.2.0-34-omap, linux-image-3.2.0-34-generic, linux-image-3.2.0-34-generic-pae, 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-ti-omap4, linux-image-3.2.0-1422-omap4
  • USN-1704-1: linux-lts-quantal, linux-image-3.5.0-22-generic
  • USN-1647-1: linux-ti-omap4, linux-image-3.5.0-215-omap4
  • USN-1652-1: linux-lts-backport-oneiric, linux-image-3.0.0-28-server, linux-image-3.0.0-28-virtual, linux-image-3.0.0-28-generic, linux-image-3.0.0-28-generic-pae
  • USN-1653-1: linux-ec2, linux-image-2.6.32-350-ec2
  • USN-1651-1: linux-image-2.6.32-45-generic-pae, linux-image-2.6.32-45-versatile, linux-image-2.6.32-45-sparc64, linux-image-2.6.32-45-server, linux-image-2.6.32-45-sparc64-smp, linux-image-2.6.32-45-powerpc64-smp, linux-image-2.6.32-45-virtual, linux-image-2.6.32-45-386, linux, linux-image-2.6.32-45-powerpc, linux-image-2.6.32-45-preempt, linux-image-2.6.32-45-powerpc-smp, linux-image-2.6.32-45-ia64, linux-image-2.6.32-45-lpia, linux-image-2.6.32-45-generic
  • USN-1650-1: linux-image-2.6.24-32-386, linux-image-2.6.24-32-generic, linux-image-2.6.24-32-mckinley, linux-image-2.6.24-32-powerpc, linux-image-2.6.24-32-openvz, linux-image-2.6.24-32-powerpc64-smp, linux-image-2.6.24-32-virtual, linux-image-2.6.24-32-xen, linux-image-2.6.24-32-hppa64, linux-image-2.6.24-32-hppa32, linux-image-2.6.24-32-rt, linux-image-2.6.24-32-lpia, linux-image-2.6.24-32-itanium, linux-image-2.6.24-32-sparc64, linux-image-2.6.24-32-powerpc-smp, linux-image-2.6.24-32-server, linux, linux-image-2.6.24-32-sparc64-smp, linux-image-2.6.24-32-lpiacompat
  • USN-1798-1: linux-ec2, linux-image-2.6.32-351-ec2
  • USN-1792-1: linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-server, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-virtual, linux, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-386, linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-sparc64-smp
  • USN-1776-1: linux-ec2, linux-image-2.6.32-351-ec2
  • USN-1775-1: linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-generic-pae, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-server, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-virtual, linux, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-386, linux-image-2.6.32-46-lpia, linux-image-2.6.32-46-sparc64-smp
  • USN-1829-1: linux-ec2, linux-image-2.6.32-352-ec2
  • USN-1824-1: linux-image-2.6.32-47-server, linux-image-2.6.32-47-powerpc64-smp, linux-image-2.6.32-47-lpia, linux-image-2.6.32-47-powerpc-smp, linux-image-2.6.32-47-sparc64-smp, linux-image-2.6.32-47-386, linux-image-2.6.32-47-generic-pae, linux-image-2.6.32-47-powerpc, linux, linux-image-2.6.32-47-generic, linux-image-2.6.32-47-versatile, linux-image-2.6.32-47-preempt, linux-image-2.6.32-47-sparc64, linux-image-2.6.32-47-ia64, linux-image-2.6.32-47-virtual