CVE-2010-4255

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    CVE-2010-4255

    Published: 25 Jan 2011Last Modified: 10 Apr 2026

    Summary:

    Details: The fixup_page_fault function in arch/x86/traps.c in Xen 4.0.1 and earlier on 64-bit platforms, when paravirtualization is enabled, does not verify that kernel mode is used to call the handle_gdt_ldt_mapping_fault function, which allows guest OS users to cause a denial of service (host OS BUG_ON) via a crafted memory access.

    References: http://secunia.com/advisories/42884, http://secunia.com/advisories/46397, http://www.vmware.com/security/advisories/VMSA-2011-0012.html, http://lists.xensource.com/archives/html/xen-devel/2010-11/msg01650.html, http://openwall.com/lists/oss-security/2010/11/30/5, http://openwall.com/lists/oss-security/2010/11/30/8, https://bugzilla.redhat.com/show_bug.cgi?id=658155, http://www.redhat.com/support/errata/RHSA-2011-0017.html, http://www.securityfocus.com/archive/1/520102/100/0/threaded

    Affected packages

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High