This update for kvm fixes the following issues :

  - 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,     which was the quick and dirty approach, but not the     proper solution. We remove that initial patch and now     rely on patches from upstream. 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 warning patch is added which attempts to detect a     migration from a qemu version which had the quick and     dirty fix (it only detects certain cases, but hopefully     is helpful.) For additional information on Spectre v2 as     it relates to QEMU, see:
    https://www.qemu.org/2018/02/14/qemu-2-11-1-and-spectre-     update/ (CVE-2017-5715 bsc#1068032)

  - 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) These two patches will be     removed when we can reasonably assume everyone is     running with the appropriate updates.

  - Security fixes for the following CVE issues:
    (bsc#1076114 CVE-2018-5683) (bsc#1083291 CVE-2018-7550)

  - This patch is already included, add here for CVE track     (bsc#1076179 CVE-2017-18030)

  - Toolchain changes have cause the built size of     pxe-virtio.rom to exceed 64K. Tweak rarely used strings     in code to reduce size of the binary so it fits again.

  - Eliminate bogus use of CPUID_7_0_EDX_PRED_CMD which     we've carried since the initial Spectre v2 patch was     added. EDX bit 27 of CPUID Leaf 07H, Sub-leaf 0 provides     status on STIBP, and not the PRED_CMD MSR. Exposing the     STIBP CPUID feature bit to the guest is wrong in     general, since the VM doesn't directly control the     scheduling of physical hyperthreads. This is left     strictly to the L0 hypervisor.

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.

Detections

Analytics

SUSE SLES11 Security Update : kvm (SUSE-SU-2018:1077-1) (Spectre)

high Nessus Plugin ID 109358

Version 1.10