USN-1246-1: Linux kernel vulnerabilities

Releases

• Ubuntu 11.04

Packages

• linux - Linux kernel

Details

Dan Rosenberg discovered that the IPv4 diagnostic routines did not
correctly validate certain requests. A local attacker could exploit this to
consume CPU resources, leading to a denial of service. (CVE-2011-2213)

Dan Rosenberg discovered that the Bluetooth stack incorrectly handled
certain L2CAP requests. If a system was using Bluetooth, a remote attacker
could send specially crafted traffic to crash the system or gain root
privileges. (CVE-2011-2497)

It was discovered that the EXT4 filesystem contained multiple off-by-one
flaws. A local attacker could exploit this to crash the system, leading to
a denial of service. (CVE-2011-2695)

Mauro Carvalho Chehab discovered that the si4713 radio driver did not
correctly check the length of memory copies. If this hardware was
available, a local attacker could exploit this to crash the system or gain
root privileges. (CVE-2011-2700)

Herbert Xu discovered that certain fields were incorrectly handled when
Generic Receive Offload (CVE-2011-2723)

Time Warns discovered that long symlinks were incorrectly handled on Be
filesystems. A local attacker could exploit this with a malformed Be
filesystem and crash the system, leading to a denial of service.
(CVE-2011-2928)

Dan Kaminsky discovered that the kernel incorrectly handled random sequence
number generation. An attacker could use this flaw to possibly predict
sequence numbers and inject packets. (CVE-2011-3188)

Darren Lavender discovered that the CIFS client incorrectly handled certain
large values. A remote attacker with a malicious server could exploit this
to crash the system or possibly execute arbitrary code as the root user.
(CVE-2011-3191)

Update instructions

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

Ubuntu 11.04

• linux-image-2.6.38-12-powerpc64-smp - 2.6.38-12.51
• linux-image-2.6.38-12-powerpc-smp - 2.6.38-12.51
• linux-image-2.6.38-12-powerpc - 2.6.38-12.51
• linux-image-2.6.38-12-generic-pae - 2.6.38-12.51
• linux-image-2.6.38-12-virtual - 2.6.38-12.51
• linux-image-2.6.38-12-server - 2.6.38-12.51
• linux-image-2.6.38-12-versatile - 2.6.38-12.51
• linux-image-2.6.38-12-omap - 2.6.38-12.51
• linux-image-2.6.38-12-generic - 2.6.38-12.51

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-2011-2213
• CVE-2011-2497
• CVE-2011-2695
• CVE-2011-2700
• CVE-2011-2723
• CVE-2011-2928
• CVE-2011-3188
• CVE-2011-3191

Related notices

• USN-1208-1: linux-image-2.6.32-418-dove, linux-mvl-dove
• USN-1241-1: linux-image-2.6.31-611-imx51, linux-fsl-imx51
• USN-1219-1: linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-server, linux-lts-backport-maverick
• USN-1228-1: linux-ti-omap4, linux-image-2.6.38-1209-omap4
• USN-1203-1: linux-image-2.6.32-218-dove, linux-mvl-dove
• USN-1220-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
• USN-1218-1: linux-image-2.6.32-34-lpia, linux-image-2.6.32-34-powerpc, linux-image-2.6.32-34-preempt, linux-image-2.6.32-34-ia64, linux-image-2.6.32-34-powerpc-smp, linux-image-2.6.32-34-powerpc64-smp, linux-image-2.6.32-34-virtual, linux-image-2.6.32-34-generic-pae, linux-image-2.6.32-34-versatile, linux-image-2.6.32-34-sparc64-smp, linux-image-2.6.32-34-server, linux-image-2.6.32-34-generic, linux-image-2.6.32-34-386, linux, linux-image-2.6.32-34-sparc64
• USN-1227-1: linux-image-2.6.35-30-omap, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-powerpc64-smp, linux, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-server
• USN-1256-1: linux-image-2.6.38-12-server, linux-lts-backport-natty, linux-image-2.6.38-12-virtual, linux-image-2.6.38-12-generic-pae, linux-image-2.6.38-12-generic
• USN-1225-1: linux-image-2.6.24-29-itanium, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-386, linux, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-powerpc-smp, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-server
• USN-1216-1: linux-image-2.6.32-318-ec2, linux-ec2
• USN-1253-1: linux-image-2.6.32-35-powerpc, linux-image-2.6.32-35-386, linux-image-2.6.32-35-sparc64, linux-image-2.6.32-35-lpia, linux-image-2.6.32-35-powerpc64-smp, linux-image-2.6.32-35-server, linux-image-2.6.32-35-powerpc-smp, linux-image-2.6.32-35-versatile, linux-image-2.6.32-35-generic-pae, linux-image-2.6.32-35-generic, linux-image-2.6.32-35-preempt, linux-image-2.6.32-35-sparc64-smp, linux-image-2.6.32-35-ia64, linux, linux-image-2.6.32-35-virtual
• USN-1239-1: linux-image-2.6.32-319-ec2, linux-ec2
• USN-1240-1: linux-image-2.6.32-219-dove, linux-mvl-dove
• USN-1245-1: linux-image-2.6.32-419-dove, linux-mvl-dove
• USN-1243-1: linux-image-2.6.35-30-omap, linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-versatile, linux-image-2.6.35-30-powerpc64-smp, linux, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-powerpc, linux-image-2.6.35-30-powerpc-smp, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-server
• USN-1244-1: linux-ti-omap4, linux-image-2.6.35-903-omap4
• USN-1242-1: linux-image-2.6.35-30-virtual, linux-image-2.6.35-30-generic-pae, linux-image-2.6.35-30-generic, linux-image-2.6.35-30-server, linux-lts-backport-maverick
• USN-1236-1: linux-image-2.6.24-29-itanium, linux-image-2.6.24-29-mckinley, linux-image-2.6.24-29-lpiacompat, linux-image-2.6.24-29-xen, linux-image-2.6.24-29-386, linux, linux-image-2.6.24-29-generic, linux-image-2.6.24-29-lpia, linux-image-2.6.24-29-sparc64, linux-image-2.6.24-29-openvz, linux-image-2.6.24-29-rt, linux-image-2.6.24-29-virtual, linux-image-2.6.24-29-powerpc64-smp, linux-image-2.6.24-29-hppa32, linux-image-2.6.24-29-sparc64-smp, linux-image-2.6.24-29-powerpc-smp, linux-image-2.6.24-29-powerpc, linux-image-2.6.24-29-hppa64, linux-image-2.6.24-29-server