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Debian Security Advisory DSA-4236-1                   security@debian.org
https://www.debian.org/security/                       Moritz Muehlenhoff
June 27, 2018                         https://www.debian.org/security/faq
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Package        : xen
CVE ID         : CVE-2018-12891 CVE-2018-12892 CVE-2018-12893

Multiple vulnerabilities have been discovered in the Xen hypervisor:

CVE-2018-12891

    It was discovered that insufficient validation of PV MMU operations
    may result in denial of service.

CVE-2018-12892

    It was discovered that libxl fails to honour the 'readonly' flag on
    HVM-emulated SCSI disks.
    
CVE-2018-12893

    It was discovered that incorrect implementation of debug exception
    checks could result in denial of service.

For the stable distribution (stretch), these problems have been fixed in
version 4.8.3+xsa267+shim4.10.1+xsa267-1+deb9u9.

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/source-package/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/

Mailing list: debian-security-announce@lists.debian.org