Ubuntu 15.10 : linux vulnerabilities (USN-2947-1)

Ubuntu Security Notice (C) 2016 Canonical, Inc. / NASL script (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

Ralf Spenneberg discovered that the usbvision driver in the Linux
kernel did not properly sanity check the interfaces and endpoints
reported by the device. An attacker with physical access could cause a
denial of service (system crash). (CVE-2015-7833)

Venkatesh Pottem discovered a use-after-free vulnerability in the
Linux kernel's CXGB3 driver. A local attacker could use this to cause
a denial of service (system crash) or possibly execute arbitrary code.
(CVE-2015-8812)

Xiaofei Rex Guo discovered a timing side channel vulnerability in the
Linux Extended Verification Module (EVM). An attacker could use this
to affect system integrity. (CVE-2016-2085)

It was discovered that the extended Berkeley Packet Filter (eBPF)
implementation in the Linux kernel did not correctly compute branch
offsets for backward jumps after ctx expansion. A local attacker could
use this to cause a denial of service (system crash) or possibly
execute arbitrary code. (CVE-2016-2383)

David Herrmann discovered that the Linux kernel incorrectly accounted
file descriptors to the original opener for in-flight file descriptors
sent over a unix domain socket. A local attacker could use this to
cause a denial of service (resource exhaustion). (CVE-2016-2550)

It was discovered that the Linux kernel did not enforce limits on the
amount of data allocated to buffer pipes. A local attacker could use
this to cause a denial of service (resource exhaustion).
(CVE-2016-2847).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected linux-image-4.2-generic,
linux-image-4.2-generic-lpae and / or linux-image-4.2-lowlatency
packages.

Risk factor :

Critical / CVSS Base Score : 10.0
(CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.4
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 90402 ()

Bugtraq ID:

CVE ID: CVE-2015-7833
CVE-2015-8812
CVE-2016-2085
CVE-2016-2383
CVE-2016-2550
CVE-2016-2847

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