[Ksplice][Ubuntu-14.04-Updates] New updates available via Ksplice (USN-2841-1)

[Oracle Ksplice]

Synopsis: USN-2841-1 can now be patched using Ksplice
CVEs: CVE-2015-7799 CVE-2015-7885 CVE-2015-8104

Systems running Ubuntu 14.04 Trusty can now use Ksplice to patch
against the latest Ubuntu Security Notice, USN-2841-1.

INSTALLING THE UPDATES

We recommend that all users of Ksplice Uptrack on Ubuntu 14.04 Trusty
install these updates.

On systems that have "autoinstall = yes" in /etc/uptrack/uptrack.conf,
these updates will be installed automatically and you do not need to
take any action.

Alternatively, you can install these updates by running:

# /usr/sbin/uptrack-upgrade -y


DESCRIPTION

* Denial-of-service in ISDN PPP device opening.

Missing allocation failure checks could result in a NULL pointer
dereference when opening an ISDN PPP device.  A local user with access
to the device could use this flaw to crash the system.


* CVE-2015-7799: Denial-of-service in PPP compression slot parameters.

Missing validation of VJ compression slot parameters for a PPP device
could result in a NULL pointer dereference and kernel crash.  A local
user with access to the PPP device could use this flaw to crash the
system.


* CVE-2015-7885: Information leak in Digi Neo and Classic PCI driver.

Missing initialization of on-stack structures could result in an
information leak of 16 bytes to user-space.


* Kernel hang in Multiple devices driver when destroying a device.

Incorrect lock ordering when destroying a RAID device could lead to a
deadlock and kernel hang.


* Kernel BUG when unmapping a hugetlbfs page.

A logic error in the hugetlbfs when unmapping a page that is mapped both
with MAP_SHARED and MAP_PRIVATE could trigger a BUG() assertion.  A local,
un-privileged user could use this flaw to cause a denial-of-service.


* Remotely triggered session loss in CIFS during file size setting.

Incorrect fallback for servers that did not support a file size setting
operation could result in a session drop under specific conditions.


* Mark unused space between __ex_table_end and rodata as non-executable.

Unused space between the end of the __ex_table and the start of rodata had
incorrect RWX protection, which could potentially be used to inject code in
a running kernel and facilitate exploits.


* NULL pointer dereference in the Multiple devices driver when switching from cleaner policy.

A flaw in the Multiple devices driver could lead to a NULL pointer
dereference in certain circumstances.  A local attack could use this flaw
to cause a denial-of-service.


* Kernel crash when using ahash driver without import/export callback.

Ahash drivers are required to provide import/export callbacks to be
registered with the ahash crypto sub-system, otherwise they could lead to a
kernel crash under certain circumstances.  A local, un-privileged user
could use this flaw to cause a denial-of-service.


* Use-after-free in Btrfs filesystem when iterating extended refs.

A flaw in the Btrfs filesystem code when iterating over extended refs leads
to a use-after-free and kernel panic.  A local, un-privileged user could
use this flaw to cause a denial-of-service.


* Remote denial-of-service when receiving socket buffers with partial checksums.

A flaw in the socket buffer code dealing with partial checksums causes out
of bounds memory accesses on the socket buffer and kernel panic.  A remote
attacker could use this flaw to cause a denial-of-service.


* Kernel BUG when passing a socket buffer allocated from pfmemalloc on a user socket.

A flaw in the socket buffer management when dealing with socket buffers
allocated from pfmemalloc could lead to a kernel BUG() assertion to trigger
under certain circumstances.  A local, un-privileged user could use this
flaw to cause a denial-of-service.


* NULL pointer dereference in the Point to point over ethernet protocol.

A flaw in the Point to point over ethernet driver could lead to a NULL
pointer dereference and kernel panic when flushing the device.  A local,
un-privileged user could use this flaw to cause a denial-of-service.


* Information leak when getting strings from the ethtool device.

A lack of cleaning an allocated buffer that is copied to user space on
ETHTOOL_GSTRINGS requests could leak information about the running kernel.
This could help an attacker to elevate privileges.


* NULL pointer dereference in Marvell 88SE64XX/88SE94XX task preparation.

A missing NULL pointer check could result in a NULL pointer dereference
and kernel crash when performing tasks on a Marvell 88SE64XX/88SE94XX
device under low memory conditions.


* Denial-of-service in software RAID5 stripe cleaning.

Incorrect locking during stripe cleaning could result in an infinite
loop and system crash.  A local, unprivileged user with write access to
a filesystem on a RAID5 device could use this flaw to crash the system.


* Memory corruption in Mellanox MLX4 slave events.

Incorrect size arguments to memcpy() calls could result in memory
corruption of MLX4 devices, causing a kernel crash.


* NULL pointer dereference in PPP over Ethernet device releasing.

An incorrect check for disconnected PPP over Ethernet devices could
result in a NULL pointer dereference and kernel crash when closing the
device.


* CVE-2015-8104: KVM host denial-of-service in debug exception.

A guest could cause a denial-of-service on a KVM host by triggering a
debug exception to fire during an existing debug exception.  This could
cause the host to get trapped in an infinite loop causing a
denial-of-service.  A privileged user in a guest could use this flaw to
crash the host.


* Use-after-free in Rados block device driver on failure to probe.

A flaw in the Rados block device driver leads to double-free if there's an
error when probing the parent device.  A local, privileged user could use
this flaw to cause a denial-of-service.


* Kernel stack overflow in Replicated Block Device driver when mapping an image.

Unlimited recursion in the Replicated Block Device driver when mapping and
image with a long chain could lead to a stack overflow.  A local user with
ability to mount handcrafted RBD images could use this flaw to cause a
denial-of-service or potentially escalate privileges.

SUPPORT

Ksplice support is available at ksplice-support_ww at oracle.com.