A xen security update has been released for both Debian GNU/Linux 9 and 10. Multiple vulnerabilities have been discovered in the Xen hypervisor, which could result in denial of service, guest-to-host privilege escalation or information leaks.

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Debian Security Advisory DSA-4602-1 security@debian.org
https://www.debian.org/security/ Moritz Muehlenhoff
January 13, 2020 https://www.debian.org/security/faq
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Package : xen
CVE ID : CVE-2019-17349 CVE-2019-17350 CVE-2019-18420 CVE-2019-18421
CVE-2019-18422 CVE-2019-18423 CVE-2019-18424 CVE-2019-18425
CVE-2019-19577 CVE-2019-19578 CVE-2019-19579 CVE-2019-19580
CVE-2019-19581 CVE-2019-19582 CVE-2019-19583 CVE-2018-12207
CVE-2018-12126 CVE-2018-12127 CVE-2018-12130 CVE-2019-11091
CVE-2019-11135 CVE-2019-17348 CVE-2019-17347 CVE-2019-17346
CVE-2019-17345 CVE-2019-17344 CVE-2019-17343 CVE-2019-17342
CVE-2019-17341 CVE-2019-17340

Multiple vulnerabilities have been discovered in the Xen hypervisor, which
could result in denial of service, guest-to-host privilege escalation or
information leaks.

In addition this update provides mitigations for the "TSX Asynchronous Abort"
speculative side channel attack. For additional information please refer to
https://xenbits.xen.org/xsa/advisory-305.html

For the oldstable distribution (stretch), these problems have been fixed
in version 4.8.5.final+shim4.10.4-1+deb9u12. Note that this will be the
last security update for Xen in the oldstable distribution; upstream
support for the 4.8.x branch ended by the end of December 2019. If you
rely on security support for your Xen installation an update to the
stable distribution (buster) is recommended.

For the stable distribution (buster), these problems have been fixed in
version 4.11.3+24-g14b62ab3e5-1~deb10u1.

We recommend that you upgrade your xen packages.

For the detailed security status of xen please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/xen

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/