CVE-2017-12154

NameCVE-2017-12154
DescriptionThe prepare_vmcs02 function in arch/x86/kvm/vmx.c in the Linux kernel through 4.13.3 does not ensure that the "CR8-load exiting" and "CR8-store exiting" L0 vmcs02 controls exist in cases where L1 omits the "use TPR shadow" vmcs12 control, which allows KVM L2 guest OS users to obtain read and write access to the hardware CR8 register.
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SuSE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1099-1, DSA-3981-1
NVD severitylow (attack range: local)

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
linux (PTS)wheezy3.2.78-1vulnerable
wheezy (security)3.2.93-1fixed
jessie3.16.43-2+deb8u2vulnerable
jessie (security)3.16.43-2+deb8u5fixed
stretch4.9.51-1fixed
stretch (security)4.9.30-2+deb9u5fixed
buster, sid4.13.4-2fixed

The information below is based on the following data on fixed versions.

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
linuxsource(unstable)4.12.13-1low
linuxsourcejessie3.16.43-2+deb8u5lowDSA-3981-1
linuxsourcestretch4.9.30-2+deb9u5lowDSA-3981-1
linuxsourcewheezy3.2.93-1lowDLA-1099-1

Notes

Fixed by: https://git.kernel.org/linus/51aa68e7d57e3217192d88ce90fd5b8ef29ec94f (v4.14-rc1)
https://www.spinics.net/lists/kvm/msg155414.html

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