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    CVE-2017-17563

    An issue was discovered in Xen through 4.9.x allowing guest OS users to cause a denial of service (host OS crash) or gain host OS privileges by leveraging an incorrect mask for reference-count overflow checking in shadow mode.

    Published:Dec 12, 2017
    Last Modified:Apr 20, 2025
    EPS:Dec 12, 2017
    EPSS Score:0.00064
    CVSS Score:7.8

    Affected Products

    Vendor
    Xen
    Product
    Xen

    Exploits

    No exploit reference

    Related CVEs

    CVE-2026-79603 (CVSS 4.3) — x86 PV guests can free memory pages while still keeping a stale TLB entry pointing to them. A TLB flush is on…
    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://www.openwall.com/lists/oss-security/2017/12/12/2
    http://www.securityfocus.com/bid/102169
    http://www.securitytracker.com/id/1040769
    https://lists.debian.org/debian-lts-announce/2018/01/msg00003.html
    https://lists.debian.org/debian-lts-announce/2018/10/msg00009.html
    https://security.gentoo.org/glsa/201801-14
    https://support.citrix.com/article/CTX232096
    https://www.debian.org/security/2018/dsa-4112
    https://xenbits.xen.org/xsa/advisory-249.html
    http://www.openwall.com/lists/oss-security/2017/12/12/2
    http://www.securityfocus.com/bid/102169
    http://www.securitytracker.com/id/1040769
    https://lists.debian.org/debian-lts-announce/2018/01/msg00003.html
    https://lists.debian.org/debian-lts-announce/2018/10/msg00009.html
    https://security.gentoo.org/glsa/201801-14
    https://support.citrix.com/article/CTX232096
    https://www.debian.org/security/2018/dsa-4112
    https://xenbits.xen.org/xsa/advisory-249.html

    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