Synopsis: Important: kernel security and bug fix update
Advisory ID: SLSA-2014:1843-1
Issue Date: 2014-11-11
CVE Numbers: CVE-2014-3185
* A race condition flaw was found in the way the Linux kernel’s KVM
subsystem handled PIT (Programmable Interval Timer) emulation. A guest
user who has access to the PIT I/O ports could use this flaw to crash the
host. (CVE-2014-3611, Important)
* A memory corruption flaw was found in the way the USB ConnectTech
WhiteHEAT serial driver processed completion commands sent via USB Request
Blocks buffers. An attacker with physical access to the system could use
this flaw to crash the system or, potentially, escalate their privileges
on the system. (CVE-2014-3185, Moderate)
* It was found that the Linux kernel’s KVM subsystem did not handle the VM
exits gracefully for the invept (Invalidate Translations Derived from EPT)
and invvpid (Invalidate Translations Based on VPID) instructions. On hosts
with an Intel processor and invept/invppid VM exit support, an
unprivileged guest user could use these instructions to crash the guest.
(CVE-2014-3645, CVE-2014-3646, Moderate)
This update also fixes the following bugs:
* This update fixes several race conditions between PCI error recovery
callbacks and potential calls of the ifup and ifdown commands in the tg3
driver. When triggered, these race conditions could cause a kernel crash.
* Previously, GFS2 failed to unmount a sub-mounted GFS2 file system if its
parent was also a GFS2 file system. This problem has been fixed by adding
the appropriate d_op->d_hash() routine call for the last component of the
mount point path in the path name lookup mechanism code (namei).
* Due to previous changes in the virtio-net driver, a Scientific Linux 6.6
guest was unable to boot with the “mgr_rxbuf=off” option specified. This
was caused by providing the page_to_skb() function with an incorrect
packet length in the driver’s Rx path. This problem has been fixed and the
guest in the described scenario can now boot successfully.
* When using one of the newer IPSec Authentication Header (AH) algorithms
with Openswan, a kernel panic could occur. This happened because the
maximum truncated ICV length was too small. To fix this problem, the
MAX_AH_AUTH_LEN parameter has been set to 64.
* A bug in the IPMI driver caused the kernel to panic when an IPMI
interface was removed using the hotmod script. The IPMI driver has been
fixed to properly clean the relevant data when removing an IPMI interface.
* Due to a bug in the IPMI driver, the kernel could panic when adding an
IPMI interface that was previously removed using the hotmod script. This
update fixes this bug by ensuring that the relevant shadow structure is
initialized at the right time.
The system must be rebooted for this update to take effect.
– Scientific Linux Development Team