| Description: | Summary:
The remote host is missing an update for the 'Linux Kernel' package(s) announced via the SUSE-SU-2018:0115-1 advisory.
Vulnerability Insight:
The SUSE Linux Enterprise 12 GA LTSS kernel was updated to receive various security and bugfixes.
This update adds mitigations for various side channel attacks against modern CPUs that could disclose content of otherwise unreadable memory
(bnc#1068032).
- CVE-2017-5753 / 'SpectreAttack': Local attackers on systems with modern
CPUs featuring deep instruction pipelining could use attacker
controllable speculative execution over code patterns in the Linux
Kernel to leak content from otherwise not readable memory in the same
address space, allowing retrieval of passwords, cryptographic keys
and other secrets.
This problem is mitigated by adding speculative fencing on affected
code paths throughout the Linux kernel.
This issue is addressed for the x86_64, the IBM Power and IBM zSeries
architecture.
- CVE-2017-5715 / 'SpectreAttack': Local attackers on systems with modern
CPUs featuring branch prediction could use mispredicted branches to
speculatively execute code patterns that in turn could be made to
leak other non-readable content in the same address space, an attack
similar to CVE-2017-5753.
This problem is mitigated by disabling predictive branches, depending
on CPU architecture either by firmware updates and/or fixes in the
user-kernel privilege boundaries.
This is done with help of Linux Kernel fixes on the Intel/AMD x86_64
and IBM zSeries architectures. On x86_64, this requires also updates
of the CPU microcode packages, delivered in seperate updates.
For IBM Power and zSeries the required firmware updates are supplied
over regular channels by IBM.
As this feature can have a performance impact, it can be disabled
using the 'nospec' kernel commandline option.
- CVE-2017-5754 / 'MeltdownAttack': Local attackers on systems with
modern CPUs featuring deep instruction pipelining could use code
patterns in userspace to speculative executive code that would read
otherwise read protected memory, an attack similar to CVE-2017-5753.
This problem is mitigated by unmapping the Linux Kernel from the user
address space during user code execution, following a approach called
'KAISER'. The terms used here are 'KAISER' / 'Kernel Address Isolation'
and 'PTI' / 'Page Table Isolation'.
This update does this on the x86_64 architecture, it is not required
on the IBM zSeries architecture.
This feature can be enabled / disabled by the 'pti=[onoffauto]' or
'nopti' commandline options.
The following security bugs were fixed:
- CVE-2017-15868: The bnep_add_connection function in net/bluetooth/bnep/core.c in the Linux kernel did not ensure that an l2cap socket is available, which allowed local users to gain privileges via a crafted application (bnc#1071470).
- CVE-2017-13167: An elevation of privilege vulnerability in the kernel sound timer. (bnc#1072876).
- CVE-2017-16538: drivers/media/usb/dvb-usb-v2/lmedm04.c in the Linux kernel ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'Linux Kernel' package(s) on SUSE Linux Enterprise Server 12.
Solution:
Please install the updated package(s).
CVSS Score:
7.2
CVSS Vector:
AV:L/AC:L/Au:N/C:C/I:C/A:C
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