USN-1644-1: Linux kernel vulnerabilities

Releases

• Ubuntu 12.04

Packages

• linux - Linux kernel

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)

Dmitry Monakhov reported a race condition flaw the Linux ext4 filesystem
that can expose stale data. An unprivileged user could exploit this flaw to
cause an information leak. (CVE-2012-4508)

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)

Dave Jones discovered that the Linux kernel's socket subsystem does not
correctly ensure the keepalive action is associated with a stream socket. A
local user could exploit this flaw to cause a denial of service (system
crash) by creating a raw socket. (CVE-2012-6657)

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)

An information leak was discovered in the Linux kernel's /dev/dvb device. A
local user could exploit this flaw to obtain sensitive information from the
kernel's stack memory. (CVE-2013-1928)

Update instructions

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

Ubuntu 12.04

• linux-image-3.2.0-34-virtual - 3.2.0-34.53
• linux-image-3.2.0-34-generic-pae - 3.2.0-34.53
• linux-image-3.2.0-34-powerpc-smp - 3.2.0-34.53
• linux-image-3.2.0-34-powerpc64-smp - 3.2.0-34.53
• linux-image-3.2.0-34-omap - 3.2.0-34.53
• linux-image-3.2.0-34-generic - 3.2.0-34.53
• linux-image-3.2.0-34-highbank - 3.2.0-34.53

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

• CVE-2012-0957
• CVE-2012-4508
• CVE-2012-4565
• CVE-2012-6536
• CVE-2012-6537
• CVE-2012-6538
• CVE-2012-6657
• CVE-2013-0309
• CVE-2013-1826
• CVE-2013-1928

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-generic, linux-image-3.0.0-28-powerpc64-smp, linux, linux-image-3.0.0-28-omap, linux-image-3.0.0-28-powerpc-smp, linux-image-3.0.0-28-generic-pae, linux-image-3.0.0-28-powerpc
• 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-image-3.5.0-22-generic, linux-lts-quantal
• USN-1646-1: linux-image-3.5.0-19-powerpc-smp, linux-image-3.5.0-19-omap, linux-image-3.5.0-19-generic, linux, linux-image-3.5.0-19-highbank, linux-image-3.5.0-19-powerpc64-smp
• USN-1647-1: linux-image-3.5.0-215-omap4, linux-ti-omap4
• USN-1652-1: linux-image-3.0.0-28-server, linux-image-3.0.0-28-virtual, linux-image-3.0.0-28-generic, linux-lts-backport-oneiric, linux-image-3.0.0-28-generic-pae
• USN-1719-1: linux-image-3.0.0-31-server, linux-image-3.0.0-31-generic, linux-image-3.0.0-31-generic-pae, linux-image-3.0.0-31-virtual, linux-lts-backport-oneiric
• USN-1900-1: linux-image-2.6.32-354-ec2, linux-ec2
• USN-1673-1: linux-ti-omap4, linux-image-3.5.0-216-omap4
• USN-1671-1: linux-image-3.5.0-21-highbank, linux-image-3.5.0-21-generic, linux-image-3.5.0-21-powerpc64-smp, linux, linux-image-3.5.0-21-powerpc-smp, linux-image-3.5.0-21-omap
• USN-1720-1: linux-image-3.0.0-31-powerpc, linux-image-3.0.0-31-powerpc64-smp, linux-image-3.0.0-31-server, linux-image-3.0.0-31-generic, linux-image-3.0.0-31-generic-pae, linux-image-3.0.0-31-virtual, linux, linux-image-3.0.0-31-powerpc-smp, linux-image-3.0.0-31-omap
• USN-1726-1: linux-image-3.0.0-1221-omap4, linux-ti-omap4
• USN-1899-1: linux-image-2.6.32-49-preempt, linux-image-2.6.32-49-server, linux-image-2.6.32-49-sparc64-smp, linux-image-2.6.32-49-sparc64, linux-image-2.6.32-49-powerpc-smp, linux-image-2.6.32-49-virtual, linux-image-2.6.32-49-lpia, linux-image-2.6.32-49-powerpc, linux, linux-image-2.6.32-49-386, linux-image-2.6.32-49-generic-pae, linux-image-2.6.32-49-versatile, linux-image-2.6.32-49-ia64, linux-image-2.6.32-49-generic, linux-image-2.6.32-49-powerpc64-smp
• USN-1653-1: linux-image-2.6.32-350-ec2, linux-ec2
• USN-1651-1: linux-image-2.6.32-45-ia64, linux-image-2.6.32-45-preempt, linux-image-2.6.32-45-powerpc64-smp, linux-image-2.6.32-45-lpia, linux-image-2.6.32-45-sparc64-smp, linux-image-2.6.32-45-versatile, linux-image-2.6.32-45-generic, linux, linux-image-2.6.32-45-sparc64, linux-image-2.6.32-45-386, linux-image-2.6.32-45-powerpc-smp, linux-image-2.6.32-45-virtual, linux-image-2.6.32-45-generic-pae, linux-image-2.6.32-45-powerpc, linux-image-2.6.32-45-server
• USN-1650-1: linux-image-2.6.24-32-virtual, linux-image-2.6.24-32-hppa64, linux-image-2.6.24-32-powerpc, linux-image-2.6.24-32-rt, linux-image-2.6.24-32-generic, linux-image-2.6.24-32-lpia, linux-image-2.6.24-32-powerpc-smp, linux-image-2.6.24-32-mckinley, linux-image-2.6.24-32-hppa32, linux-image-2.6.24-32-server, linux-image-2.6.24-32-sparc64-smp, linux-image-2.6.24-32-powerpc64-smp, linux-image-2.6.24-32-itanium, linux-image-2.6.24-32-openvz, linux-image-2.6.24-32-386, linux, linux-image-2.6.24-32-xen, linux-image-2.6.24-32-lpiacompat, linux-image-2.6.24-32-sparc64
• USN-1798-1: linux-ec2, linux-image-2.6.32-351-ec2
• USN-1792-1: linux-image-2.6.32-46-server, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-386, linux-image-2.6.32-46-virtual, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-generic-pae, linux, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-lpia
• USN-1776-1: linux-ec2, linux-image-2.6.32-351-ec2
• USN-1775-1: linux-image-2.6.32-46-server, linux-image-2.6.32-46-sparc64-smp, linux-image-2.6.32-46-386, linux-image-2.6.32-46-virtual, linux-image-2.6.32-46-preempt, linux-image-2.6.32-46-powerpc, linux-image-2.6.32-46-generic, linux-image-2.6.32-46-generic-pae, linux, linux-image-2.6.32-46-powerpc-smp, linux-image-2.6.32-46-ia64, linux-image-2.6.32-46-powerpc64-smp, linux-image-2.6.32-46-sparc64, linux-image-2.6.32-46-versatile, linux-image-2.6.32-46-lpia
• USN-1829-1: linux-image-2.6.32-352-ec2, linux-ec2
• USN-1824-1: linux-image-2.6.32-47-preempt, linux-image-2.6.32-47-lpia, linux-image-2.6.32-47-powerpc-smp, linux-image-2.6.32-47-generic-pae, linux-image-2.6.32-47-ia64, linux-image-2.6.32-47-386, linux-image-2.6.32-47-virtual, linux-image-2.6.32-47-sparc64-smp, linux-image-2.6.32-47-versatile, linux, linux-image-2.6.32-47-powerpc, linux-image-2.6.32-47-sparc64, linux-image-2.6.32-47-powerpc64-smp, linux-image-2.6.32-47-generic, linux-image-2.6.32-47-server