The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window, when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of them would still be inserted into the guest's secondary (P2M) page tables.

The remote Debian 13 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-6424 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6424-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     August 09, 2026                       https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : xen     CVE ID         : CVE-2025-10263 CVE-2025-54505 CVE-2025-54518 CVE-2026-23554                      CVE-2026-23555 CVE-2026-23556 CVE-2026-23557 CVE-2026-23558                      CVE-2026-42487 CVE-2026-42488 CVE-2026-42489 CVE-2026-42490                      CVE-2026-42493 CVE-2026-42494 CVE-2026-42495 CVE-2026-62423                      CVE-2026-62424 CVE-2026-62425 CVE-2026-62426 CVE-2026-62427                      CVE-2026-62428 CVE-2026-62429 CVE-2026-62430 CVE-2026-62431                      CVE-2026-62432 CVE-2026-62433 CVE-2026-62434 CVE-2026-62435                      CVE-2026-62436

    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 4.20.3+127-gc42374a105-0+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 SLES12 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:2066-1 advisory.

    This update for xen fixes the following issues

    - CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
    - CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
    - CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
    - CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).

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-2026:2102-1 advisory.

    This update for xen fixes the following issues

    - CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
    - CVE-2025-54518: AMD-SN-7052: CPU OP Cache Corruption (bsc#1264066).
    - CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
    - CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).

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 Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-0c9aff64a5 advisory.

    oxenstored keeps quota related use counts across domain destruction     [XSA-483, CVE-2026-23556]     Xenstored DoS via XS_RESET_WATCHES command [XSA-484, CVE-2026-23557]     grant table v2 race in status page mapping [XSA-486, CVE-2026-23558]     x86: Floating Point Divider State Sampling [XSA-488, CVE-2025-54505]

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 SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1743-1 advisory.

    - Update to Xen 4.20.3 bug fix release (bsc#1027519) (jsc#PED-8907).
    - CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
    - CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
    - CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).

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 Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-883e88db68 advisory.

    oxenstored keeps quota related use counts across domain destruction     [XSA-483, CVE-2026-23556]     Xenstored DoS via XS_RESET_WATCHES command [XSA-484, CVE-2026-23557]     grant table v2 race in status page mapping [XSA-486, CVE-2026-23558]     x86: Floating Point Divider State Sampling [XSA-488, CVE-2025-54505]

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 SLES15 / SLES_SAP15 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2026:1657-1 advisory.

    - CVE-2025-54505: floating point divider state sampling on AMD CPUs AMD-SN-7053 (bsc#1262428).
    - CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178).
    - CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180).

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 Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-78cd69d9ae advisory.

    oxenstored keeps quota related use counts across domain destruction     [XSA-483, CVE-2026-23556]     Xenstored DoS via XS_RESET_WATCHES command [XSA-484, CVE-2026-23557]     grant table v2 race in status page mapping [XSA-486, CVE-2026-23558]     x86: Floating Point Divider State Sampling [XSA-488, CVE-2025-54505]

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

  - The adjustments made for XSA-379 as well as those subsequently becoming XSA-387 still left a race window,     when a HVM or PVH guest does a grant table version change from v2 to v1 in parallel with mapping the     status page(s) via XENMEM_add_to_physmap. Some of the status pages may then be freed while mappings of     them would still be inserted into the guest's secondary (P2M) page tables. (CVE-2026-23558)

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

ID	Name	Product	Family	Type	Severity
333555	Debian dsa-6424 : libxen-dev - security update	Nessus	Debian Local Security Checks	Local	critical
317720	SUSE SLES12 Security Update : xen (SUSE-SU-2026:2066-1)	Nessus	SuSE Local Security Checks	Local	high
317658	SUSE SLES15 Security Update : xen (SUSE-SU-2026:2102-1)	Nessus	SuSE Local Security Checks	Local	high
314598	Fedora 42 : xen (2026-0c9aff64a5)	Nessus	Fedora Local Security Checks	Local	low
313687	SUSE SLED15 / SLES15 Security Update : xen (SUSE-SU-2026:1743-1)	Nessus	SuSE Local Security Checks	Local	low
311776	Fedora 44 : xen (2026-883e88db68)	Nessus	Fedora Local Security Checks	Local	low
311741	SUSE SLES15 Security Update : xen (SUSE-SU-2026:1657-1)	Nessus	SuSE Local Security Checks	Local	low
311366	Fedora 43 : xen (2026-78cd69d9ae)	Nessus	Fedora Local Security Checks	Local	low
310841	Linux Distros Unpatched Vulnerability : CVE-2026-23558	Nessus	Misc.	Local	high

Detections

Analytics

CVE-2026-23558

high

Tenable Plugins

critical

high

high

low

low

low

low

low

high