CVE-2019-11091

NameCVE-2019-11091
DescriptionMicroarchitectural Data Sampling Uncacheable Memory (MDSUM): Uncacheable memory on some microprocessors utilizing speculative execution may allow an authenticated user to potentially enable information disclosure via a side channel with local access. A list of impacted products can be found here: https://www.intel.com/content/dam/www/public/us/en/documents/corporate-information/SA00233-microcode-update-guidance_05132019.pdf
SourceCVE (at NVD; CERT, LWN, oss-sec, fulldisc, bugtraq, EDB, Metasploit, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, Mageia, GitHub code/issues, web search, more)
ReferencesDLA-1787-1, DLA-1789-1, DLA-1789-2, DLA-1799-1, DSA-4444-1, DSA-4447-1
NVD severitymedium (attack range: local)
Debian Bugs929129

Vulnerable and fixed packages

The table below lists information on source packages.

Source PackageReleaseVersionStatus
intel-microcode (PTS)jessie/non-free3.20180425.1~deb8u1vulnerable
stretch/non-free (security), stretch/non-free3.20190618.1~deb9u1fixed
buster/non-free3.20190618.1fixed
bullseye/non-free, sid/non-free3.20190918.1fixed
jessie/non-free (security)3.20190618.1~deb8u1fixed
linux (PTS)jessie3.16.56-1+deb8u1vulnerable
jessie (security)3.16.74-1fixed
stretch4.9.189-3fixed
stretch (security)4.9.189-3+deb9u1fixed
buster4.19.67-2fixed
buster (security)4.19.67-2+deb10u1fixed
bullseye, sid5.2.17-1fixed
linux-4.9 (PTS)jessie (security)4.9.189-3+deb9u1~deb8u1fixed
xen (PTS)jessie4.4.1-9+deb8u10vulnerable
jessie (security)4.4.4lts5-0+deb8u1vulnerable
stretch (security), stretch4.8.5+shim4.10.2+xsa282-1+deb9u11vulnerable
buster, bullseye, sid4.11.1+92-g6c33308a8d-2fixed

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

PackageTypeReleaseFixed VersionUrgencyOriginDebian Bugs
intel-microcodesource(unstable)3.20190514.1medium
intel-microcodesourcejessie3.20190618.1~deb8u1mediumDLA-1789-2
intel-microcodesourcestretch3.20190514.1~deb9u1mediumDSA-4447-1
linuxsource(unstable)4.19.37-2medium
linuxsourcejessie3.16.68-1mediumDLA-1799-1
linuxsourcestretch4.9.168-1+deb9u2mediumDSA-4444-1
linux-4.9sourcejessie4.9.168-1+deb9u2~deb8u1mediumDLA-1787-1
xensource(unstable)4.11.1+92-g6c33308a8d-1medium929129

Notes

[jessie] - xen <ignored> (Depends on fix for CVE-2017-5715, CVE-2017-5753, CVE-2017-5754)
https://git.kernel.org/linus/fa4bff165070dc40a3de35b78e4f8da8e8d85ec5
https://software.intel.com/security-software-guidance/software-guidance/microarchitectural-data-sampling
https://xenbits.xen.org/xsa/advisory-297.html
libvirt support for md-clear CPUID bit:
https://libvirt.org/git/?p=libvirt.git;a=commit;h=538d873571d7a682852dc1d70e5f4478f4d64e85
qemu and libvirt need updates to passthrough md-clear, see #929067 for qemu and #929154 for libvirt

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