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    Debian: DSA-3554-1: xen security update

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    Multiple vulnerabilities have been discovered in the Xen hypervisor. The Common Vulnerabilities and Exposures project identifies the following problems:
    
    - -------------------------------------------------------------------------
    Debian Security Advisory DSA-3554-1                   This email address is being protected from spambots. You need JavaScript enabled to view it.
    https://www.debian.org/security/                     Salvatore Bonaccorso
    April 21, 2016                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------
    
    Package        : xen
    CVE ID         : CVE-2016-3158 CVE-2016-3159 CVE-2016-3960
    
    Multiple vulnerabilities have been discovered in the Xen hypervisor. The
    Common Vulnerabilities and Exposures project identifies the following
    problems:
    
    CVE-2016-3158, CVE-2016-3159 (XSA-172)
    
        Jan Beulich from SUSE discovered that Xen does not properly handle
        writes to the hardware FSW.ES bit when running on AMD64 processors.
        A malicious domain can take advantage of this flaw to obtain address
        space usage and timing information, about another domain, at a
        fairly low rate.
    
    CVE-2016-3960 (XSA-173)
    
        Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360
        discovered an integer overflow in the x86 shadow pagetable code. A
        HVM guest using shadow pagetables can cause the host to crash. A PV
        guest using shadow pagetables (i.e. being migrated) with PV
        superpages enabled (which is not the default) can crash the host, or
        corrupt hypervisor memory, potentially leading to privilege
        escalation.
    
    For the stable distribution (jessie), these problems have been fixed in
    version 4.4.1-9+deb8u5.
    
    We recommend that you upgrade your xen packages.
    
    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: This email address is being protected from spambots. You need JavaScript enabled to view it.
    

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