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    CVE-2008-3687

    Heap-based buffer overflow in the flask_security_label function in Xen 3.3, when compiled with the XSM:FLASK module, allows unprivileged domain users (domU) to execute arbitrary code via the flask_op hypercall.

    Published:Aug 14, 2008
    Last Modified:Apr 23, 2026
    EPS:Aug 14, 2008
    EPSS Score:0.01613
    CVSS Score:6.8

    Affected Products

    Vendor
    Xen
    Product
    Xen
    Vendor
    Xen
    Product
    Xen Flask Module

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-79602 (CVSS 8.8) — A guest with a PCI device assigned that has at least a BAR on the IO port space can trigger a BUG() in Xen.…
    CVE-2026-62437 (CVSS 6.5) — When guests are terminated, various pieces of cleanup need carrying out. The cleaning up of PCI devices which …
    CVE-2026-62434 (CVSS 5.3) — A guest started with Populated on Demand enabled (PoD) can attempt to reclaim pages which aren't regular guest…
    CVE-2026-62433 (CVSS 7.3) — Parts of the DM_OP handling code assumes the caller has provided the required number of buffers for the given …
    CVE-2026-62432 (CVSS 7.3) — The EVTCHNOP_expand_array hypercall checks for whether FIFO event channels are enabled, but without holding th…
    CVE-2026-62431 (CVSS 7.5) — The logic to handle periodic Viridian STIMERs performs a division with an unchecked user-controlled divisor va…
    CVE-2026-62430 (CVSS 7.5) — Accesses to the CMOS memory contents are done using an indirect IO port pair. Therefore Xen needs to cache th…
    CVE-2026-62429 (CVSS 6.5) — Accessing the vNUMA configuration data of a guest is still possible when domain destruction has already starte…
    CVE-2026-62436 (CVSS 6.5) — [This CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities corresp…

    References

    http://invisiblethingslab.com/bh08/part2.pdf
    http://secunia.com/advisories/31561
    http://theinvisiblethings.blogspot.com/2008/08/our-xen-0wning-trilogy-highlights.html
    http://www.nabble.com/-PATCH--XSM--FLASK--Argument-handling-bugs-in-XSM:FLASK-to18536032.html
    http://www.securityfocus.com/bid/30834
    http://www.securitytracker.com/id?1020731
    http://www.vupen.com/english/advisories/2008/2426
    http://xenbits.xensource.com/xen-3.3-testing.hg?rev/fa66b33f975a
    https://exchange.xforce.ibmcloud.com/vulnerabilities/44608
    http://invisiblethingslab.com/bh08/part2.pdf
    http://secunia.com/advisories/31561
    http://theinvisiblethings.blogspot.com/2008/08/our-xen-0wning-trilogy-highlights.html
    http://www.nabble.com/-PATCH--XSM--FLASK--Argument-handling-bugs-in-XSM:FLASK-to18536032.html
    http://www.securityfocus.com/bid/30834
    http://www.securitytracker.com/id?1020731
    http://www.vupen.com/english/advisories/2008/2426
    http://xenbits.xensource.com/xen-3.3-testing.hg?rev/fa66b33f975a
    https://exchange.xforce.ibmcloud.com/vulnerabilities/44608

    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