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- CVEs with nessus.description==This update for qemu fixes several issues. This security issue was
fixed :
- CVE-2018-3639: Spectre v4 vulnerability mitigation
support for KVM guests (bsc#1092885). Systems with
microprocessors utilizing speculative execution and
speculative execution of memory reads before the
addresses of all prior memory writes are known may allow
unauthorized disclosure of information to an attacker
with local user access via a side-channel analysis. This
patch permits the new x86 cpu feature flag named 'ssbd'
to be presented to the guest, given that the host has
this feature, and KVM exposes it to the guest as well.
For this feature to be enabled please use the qemu
commandline
-cpu $MODEL,+spec-ctrl,+ssbd so the guest OS can take
advantage of the feature. spec-ctrl and ssbd support is
also required in the host.
- CVE-2017-5715: This update has the next round of Spectre
v2 related patches, which now integrates with
corresponding changes in libvirt. A January 2018 release
of qemu initially addressed the Spectre v2 vulnerability
for KVM guests by exposing the spec-ctrl feature for all
x86 vcpu types. We remove that initial patch and now
rely on patches from upstream (bsc#1068032). This update
defines spec_ctrl and ibpb cpu feature flags as well as
new cpu models which are clones of existing models with
either -IBRS or -IBPB added to the end of the model
name. These new vcpu models explicitly include the new
feature(s), whereas the feature flags can be added to
the cpu parameter as with other features. In short, for
continued Spectre v2 protection, ensure that either the
appropriate cpu feature flag is added to the QEMU
command-line, or one of the new cpu models is used.
Although migration from older versions is supported, the
new cpu features won't be properly exposed to the guest
until it is restarted with the cpu features explicitly
added. A reboot is insufficient.
- A patch is added to continue to detect Spectre v2
mitigation features (as shown by cpuid), and if found
provide that feature to guests, even if running on older
KVM (kernel) versions which do not yet expose that
feature to QEMU. (bsc#1082276)
Note that Tenable Network Security has extracted the preceding
description block directly from the SUSE security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.
Max CVSS | 0 |
Min CVSS | 0 |
Total Count | 2 |
| ID | CVSS | Summary | Last (major) update | Published |
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