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Fedora 43 : xen (2026-9b1af4c793)

high Nessus Plugin ID 334454

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 43 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-9b1af4c793 advisory.

 update to xen 4.20.4 includes security fixes x86 shadow paging is deprecated [XSA-495, CVE-2026-42493] vIRQ event channel binding may break Xenstore [XSA-496, CVE-2026-42492] buffer overruns in libfsimage iso9660 handling [XSA-497, CVE-2026-42494, CVE-2026-42495, CVE-2026-62423, CVE-2026-62424, CVE-2026-62425] sysctl and platform-op locks open to abuse [XSA-499, CVE-2026-62426, CVE-2026-62427] grant-table: type confusion in grant-copy [XSA-500, CVE-2026-62428] grant-table: version change racing with other operations [XSA-501, CVE-2026-62435, CVE-2026-62436] vNUMA domain cleanup may race other operations [XSA-502, CVE-2026-62429] x86: Out-of-bounds read in vRTC emulation [XSA-503, CVE-2026-62430] Viridian STIMER division by zero [XSA-504, CVE-2026-62431] evtchn: Race between FIFO expand and reset [XSA-505, CVE-2026-62432] correct buffer checks for DM_OP hypercalls [XSA-506, CVE-2026-62433] PoD: Don't try to reclaim special pages [XSA-507, CVE-2026-62434] pygrub is only supported in de-privileged mode [XSA-508] x86 HVM I/O port list traversal [XSA-491, CVE-2026-42487] domctl lock open to abuse [XSA-492, CVE-2026-42489, CVE-2026-42490] Arm: Completion of memory accesses not guaranteed by completion of a TLBI [XSA-493, CVE-2025-10263] x86: mismatched mapcache metadata [XSA-494, CVE-2026-42488]

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.

Solution

Update the affected xen package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-9b1af4c793

Plugin Details

Severity: High

ID: 334454

File Name: fedora_2026-9b1af4c793.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 8/11/2026

Updated: 8/11/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.5

Percentile: 98.46

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:N

CVSS Score Source: CVE-2025-10263

CVSS v3

Risk Factor: High

Base Score: 8.8

Temporal Score: 7.7

Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS Score Source: CVE-2026-62427

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:43, p-cpe:/a:fedoraproject:fedora:xen

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 7/30/2026

Vulnerability Publication Date: 6/9/2026

Reference Information

CVE: CVE-2025-10263, CVE-2026-42487, CVE-2026-42488, CVE-2026-42489, CVE-2026-42490, CVE-2026-42492, 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

FEDORA: 2026-9b1af4c793

IAVB: 2026-B-0151