XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations. Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change, status pages would be freed. During the second change they would be allocated again. Hence across the full pair of change the addresses of the status pages may change, rendering stale previously calculated pointers into the status array.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4942-1 advisory.

    - CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround (bsc#1283317).
    - CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
    - CVE-2026-79610: grant-table: double version change race (bsc#1283322).
    - CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
    - CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The version of Citrix XenServer installed on the remote host is 8.4.x or 9.x. It is, therefore, affected by multiple vulnerabilities as referenced in the CTX697170 advisory:

  - A grant table race on a v2 -> v1 -> v2 version change may allow a privileged user in a guest VM to compromise     or crash the host. (CVE-2026-79610)

  - A vulnerability in tapdisk may allow a privileged user in a guest VM to compromise or crash the host.
    (CVE-2026-102701)

  - A VMX VMentry failure with branch tracing and blocked states may allow an unprivileged user in a guest VM to     crash that guest VM. (CVE-2026-79611)

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number. The vendor delivers this update through the XenServer update channels without changing the reported product version, so Nessus cannot determine whether the update has been applied.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - XSA-501 was about issues with v1 -> v2 and v2 -> v1 changes racing certain other grant table operations.
    Sadly a v2 -> v1 -> v2 change has yet another effect which wasn't accounted for: During the first change,     status pages would be freed. During the second change they would be allocated again. Hence across the full     pair of change the addresses of the status pages may change, rendering stale previously calculated     pointers into the status array. (CVE-2026-79610)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-839be67202 advisory.

    x86/AMD: ineffectual Zenbleed workaround [XSA-515, CVE-2026-79608]     x86: XPTI may break on huge-memory systems [XSA-516, CVE-2026-79609]     grant-table: double version change race [XSA-517, CVE-2026-79610]     VMX: VMentry failure with branch tracing and blocked states     [XSA-518, CVE-2026-79611]     Arm: multiple issues with GNTTABOP_cache_flush     [XSA-519, CVE-2026-102699, CVE-2026-102702]     gnttab: cache-flush handling may cause page reference leak     [XSA-520, CVE-2026-102700]

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES12 / SLES_SAP12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4732-1 advisory.

    - CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
    - CVE-2026-79610: grant-table: double version change race (bsc#1283322).
    - CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
    - CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6571 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6571-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     October 18, 2026                      https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xen     CVE ID         : CVE-2026-62437 CVE-2026-79602 CVE-2026-79603 CVE-2026-79604                      CVE-2026-79608 CVE-2026-79609 CVE-2026-79610 CVE-2026-79611                      CVE-2026-102699 CVE-2026-102700 CVE-2026-102702

    Multiple vulnerabilities have been discovered in the Xen hypervisor,     which could result in privilege escalation, information disclosure or     denial of service.

    For the stable distribution (trixie), these problems have been fixed in     version 4.20.4+39-gf1e1321c87-0+deb13u1.

    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/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

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4641-1 advisory.

    Security issues fixed:

    - CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
    - CVE-2026-79610: grant-table: double version change race (bsc#1283322).
    - CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
    - CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

    Non security issue fixed:

    - Xen: Missing upstream bug fixes (bsc#1027519).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:4642-1 advisory.

    - CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
    - CVE-2026-79610: grant-table: double version change race (bsc#1283322).
    - CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states (bsc#1283323).
    - CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak (bsc#1283325).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
374779	SUSE SLED15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2026:4942-1)	Nessus	SuSE Local Security Checks	Local	critical
370480	Citrix XenServer 8.4.x / 9.x Multiple Vulnerabilities (CTX697170)	Nessus	Misc.	Local	high
369394	Linux Distros Unpatched Vulnerability : CVE-2026-79610	Nessus	Misc.	Local	high
369374	Fedora 44 : xen (2026-839be67202)	Nessus	Fedora Local Security Checks	Local	critical
367742	SUSE SLES12: xen / xen-devel / xen-doc-html / xen-libs / xen-libs-32bit / etc (SUSE-SU-2026:4732-1)	Nessus	SuSE Local Security Checks	Local	high
366977	Debian dsa-6571 : libxen-dev - security update	Nessus	Debian Local Security Checks	Local	critical
366057	SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2026:4641-1)	Nessus	SuSE Local Security Checks	Local	high
366037	SUSE SLES15: xen / xen-devel / xen-libs / xen-tools / xen-tools-domU / etc (SUSE-SU-2026:4642-1)	Nessus	SuSE Local Security Checks	Local	high

Detections

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CVE-2026-79610

high

Tenable Plugins

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high

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critical

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high