Scientific Linux Security Update : kernel on SL7.x x86_64

This script is Copyright (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

Security Fix(es) :

- A flaw was found in the way the Linux kernel's ASN.1 DER
decoder processed certain certificate files with tags of
indefinite length. A local, unprivileged user could use
a specially crafted X.509 certificate DER file to crash
the system or, potentially, escalate their privileges on
the system. (CVE-2016-0758, Important)

Bug Fix(es) :

- Under certain conditions, the migration threads could
race with the CPU hotplug, which could cause a deadlock.
A set of patches has been provided to fix this bug, and
the deadlock no longer occurs in the system.

- A bug in the code that cleans up revoked delegations
could previously cause a soft lockup in the NFS server.
This patch fixes the underlying source code, so the
lockup no longer occurs.

- The second attempt to reload Common Application
Programming Interface (CAPI) devices on the
little-endian variant of IBM Power Systems previously
failed. The provided set of patches fixes this bug, and
reloading works as intended.

- Due to inconsistencies in page size of IOMMU, the NVMe
device, and the kernel, the BUG_ON signal previously
occurred in the nvme_setup_prps() function, leading to
the system crash while setting up the DMA transfer. The
provided patch sets the default NVMe page size to 4k,
thus preventing the system crash.

- Previously, on a system using the Infiniband mlx5 driver
used for the SRP stack, a hard lockup previously
occurred after the kernel exceeded time with lock held
with interrupts blocked. As a consequence, the system
panicked. This update fixes this bug, and the system no
longer panics in this situation.

- On the little-endian variant of IBM Power Systems, the
kernel previously crashed in the bitmap_weight()
function while running the memory affinity script. The
provided patch fortifies the topology setup and prevents
sd->child from being set to NULL when it is already
NULL. As a result, the memory affinity script runs
successfully.

- When a KVM guest wrote random values to the
special-purpose registers (SPR) Instruction Authority
Mask Register (IAMR), the guest and the corresponding
QEMU process previously hung. This update adds the code
which sets SPRs to a suitable neutral value on guest
exit, thus fixing this bug.

- Under heavy iSCSI traffic load, the system previously
panicked due to a race in the locking code leading to a
list corruption. This update fixes this bug, and the
system no longer panics in this situation.

- During SCSI exception handling (triggered by some
irregularities), the driver could previously use an
already retired SCSI command. As a consequence, a kernel
panic or data corruption occurred. The provided patches
fix this bug, and exception handling now proceeds
successfully.

- When the previously opened /dev/tty, which pointed to a
pseudo terminal (pty) pair, was the last file closed, a
kernel crash could previously occur. The underlying
source code has been fixed, preventing this bug.

- Previously, when using VPLEX and FCoE via the bnx2fc
driver, different degrees of data corruption occurred.
The provided patch fixes the FCP Response (RSP) residual
parsing in bnx2fc, which prevents the aforementioned
corruption.

See also :

http://www.nessus.org/u?1286486c

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 91215 ()

Bugtraq ID:

CVE ID: CVE-2016-0758

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