Permissions, Privileges, and Access Controls in Xen - CVE-2026-23553
Published: January 27, 2026
Vulnerability identifier: #VU122072
CSH Severity: Low
CVSS v4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-23553
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to gain access to sensitive information.
The vulnerability exists due to incomplete IBPB for vCPU isolation. A guest processes can leverage information leaks to obtain information intended to be private to other entities in a guest.
Affected software
Xen
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
Server Applications Module
openSUSE Leap
Fedora
Citrix XenServer
xen-doc-html
xen-tools-debuginfo
xen-tools-domU-debuginfo
xen-tools
xen-debugsource
xen-libs
xen-libs-32bit
xen
xen-libs-debuginfo-32bit
xen-tools-domU
xen-libs-debuginfo
xen-devel
xen-libs-64bit
xen-libs-64bit-debuginfo
xen-tools-xendomains-wait-disk
xen-libs-32bit-debuginfo
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
Server Applications Module
openSUSE Leap
Fedora
Citrix XenServer
xen-doc-html
xen-tools-debuginfo
xen-tools-domU-debuginfo
xen-tools
xen-debugsource
xen-libs
xen-libs-32bit
xen
xen-libs-debuginfo-32bit
xen-tools-domU
xen-libs-debuginfo
xen-devel
xen-libs-64bit
xen-libs-64bit-debuginfo
xen-tools-xendomains-wait-disk
xen-libs-32bit-debuginfo
How to mitigate CVE-2026-23553
Install updates from vendor's website.
xen-doc-html - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen-tools-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-tools - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-debugsource - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-32bit - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-debuginfo-32bit - update to 4.12.4_64-3.137.1
xen-tools-domU - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-devel - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-64bit - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen-libs-64bit-debuginfo - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen-tools-xendomains-wait-disk - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-32bit-debuginfo - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen - addressed in versions 4.19.4-2.fc42, 4.20.2-3.fc43
xen-tools-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-tools - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-debugsource - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-32bit - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-debuginfo-32bit - update to 4.12.4_64-3.137.1
xen-tools-domU - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-debuginfo - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-devel - addressed in versions 4.12.4_64-3.137.1, 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-64bit - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen-libs-64bit-debuginfo - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen-tools-xendomains-wait-disk - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1, 4.20.2_04-150700.3.22.1, 4.20.2_06-150700.3.25.1
xen-libs-32bit-debuginfo - addressed in versions 4.14.6_28-150300.3.94.1, 4.16.7_06-150400.4.78.1, 4.17.6_04-150500.3.59.1, 4.18.5_10-150600.3.37.1
xen - addressed in versions 4.19.4-2.fc42, 4.20.2-3.fc43