| Description: | Summary:
The remote host is missing an update for the 'Linux Kernel' package(s) announced via the SUSE-SU-2018:1377-2 advisory.
Vulnerability Insight:
The SUSE Linux Enterprise 12 SP2 LTSS kernel was updated to receive various security and bugfixes.
The following security bug was fixed:
- CVE-2018-3639: Information leaks using 'Memory Disambiguation' feature
in modern CPUs were mitigated, aka 'Spectre Variant 4' (bnc#1087082).
A new boot commandline option was introduced,
'spec_store_bypass_disable', which can have following values:
- auto: Kernel detects whether your CPU model contains an implementation
of Speculative Store Bypass and picks the most appropriate mitigation.
- on: disable Speculative Store Bypass
- off: enable Speculative Store Bypass
- prctl: Control Speculative Store Bypass per thread via
prctl. Speculative Store Bypass is enabled for a process by default. The
state of the control is inherited on fork.
- seccomp: Same as 'prctl' above, but all seccomp threads will disable
SSB unless they explicitly opt out.
The default is 'seccomp', meaning programs need explicit opt-in into the mitigation.
Status can be queried via the /sys/devices/system/cpu/vulnerabilities/spec_store_bypass file, containing:
- 'Vulnerable'
- 'Mitigation: Speculative Store Bypass disabled'
- 'Mitigation: Speculative Store Bypass disabled via prctl'
- 'Mitigation: Speculative Store Bypass disabled via prctl and seccomp'
The following related and non-security bugs were fixed:
- cpuid: Fix cpuid.edx.7.0 propagation to guest
- ext4: Fix hole length detection in ext4_ind_map_blocks() (bsc#1090953).
- ibmvnic: Clean actual number of RX or TX pools (bsc#1092289).
- kvm: Introduce nopvspin kernel parameter (bsc#1056427).
- kvm: Fix nopvspin static branch init usage (bsc#1056427).
- powerpc/64: Use barrier_nospec in syscall entry (bsc#1068032, bsc#1080157).
- powerpc/64s: Add barrier_nospec (bsc#1068032, bsc#1080157).
- powerpc/64s: Add support for ori barrier_nospec patching (bsc#1068032, bsc#1080157).
- powerpc/64s: Enable barrier_nospec based on firmware settings (bsc#1068032, bsc#1080157).
- powerpc/64s: Enhance the information in cpu_show_meltdown() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Enhance the information in cpu_show_spectre_v1() (bsc#1068032).
- powerpc/64s: Fix section mismatch warnings from setup_rfi_flush() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Move cpu_show_meltdown() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Patch barrier_nospec in modules (bsc#1068032, bsc#1080157).
- powerpc/64s: Wire up cpu_show_spectre_v1() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/64s: Wire up cpu_show_spectre_v2() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/powernv: Set or clear security feature flags (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/powernv: Use the security flags in pnv_setup_rfi_flush() (bsc#1068032, bsc#1075087, bsc#1091041).
- powerpc/pseries: Add new H_GET_CPU_CHARACTERISTICS flags (bsc#1068032, bsc#1075087, bsc#1091041).
- ... [Please see the references for more information on the vulnerabilities]
Affected Software/OS:
'Linux Kernel' package(s) on SUSE Linux Enterprise Server 12-SP2.
Solution:
Please install the updated package(s).
CVSS Score:
2.1
CVSS Vector:
AV:L/AC:L/Au:N/C:P/I:N/A:N
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