USN-2631-1: Linux kernel vulnerabilities
10 June 2015
Several security issues were fixed in the kernel.
- linux - Linux kernel
Jan Beulich discovered the Xen virtual machine subsystem of the Linux
kernel did not properly restrict access to PCI command registers. A local
guest user could exploit this flaw to cause a denial of service (host
A privilege escalation was discovered in the fork syscall via the int80
entry on 64 bit kernels with 32 bit emulation support. An unprivileged
local attacker could exploit this flaw to increase their privileges on the
A memory corruption issue was discovered in AES decryption when using the
Intel AES-NI accelerated code path. A remote attacker could exploit this
flaw to cause a denial of service (system crash) or potentially escalate
privileges on Intel base machines with AEC-GCM mode IPSec security
Wen Xu discovered a use-after-free flaw in the Linux kernel's ipv4 ping
support. A local user could exploit this flaw to cause a denial of service
(system crash) or gain administrative privileges on the system.
Carl H Lunde discovered missing sanity checks in the Linux kernel's UDF
file system (CONFIG_UDF_FS). A local attacker could exploit this flaw to cause
a denial of service (system crash) by using a corrupted file system image.
The problem can be corrected by updating your system to the following package versions:
- linux-image-3.2.0-85-generic - 3.2.0-85.122
- linux-image-3.2.0-85-generic-pae - 3.2.0-85.122
- linux-image-3.2.0-85-highbank - 3.2.0-85.122
- linux-image-3.2.0-85-omap - 3.2.0-85.122
- linux-image-3.2.0-85-powerpc-smp - 3.2.0-85.122
- linux-image-3.2.0-85-powerpc64-smp - 3.2.0-85.122
- linux-image-3.2.0-85-virtual - 3.2.0-85.122
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.