Improper control of a resource through its lifetime in Xen - CVE-2026-42488

Vulnerability identifier: #VU134010

CSH Severity: Low

CVSS v4: 7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-42488

CWE-ID: CWE-664

Exploitation vector: Local access

Exploit availability: No public exploit available

The vulnerability allows a local user to escalate privileges, cause a denial of service, or disclose sensitive information.

The vulnerability exists due to improper state management in the x86 shadow paging mapcache metadata handling when switching page tables on certain shadow paging error paths. A local user can trigger the affected shadow mode conditions from a 64-bit PV guest to escalate privileges, cause a denial of service, or disclose sensitive information.

Only x86 systems are affected, and exploitation is possible only from 64-bit PV guests running in shadow mode.

Xen
Debian Linux
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
SUSE Linux Enterprise Server 12 SP5
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise High Performance Computing 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Micro
SUSE Linux Enterprise Micro for Rancher
Basesystem Module
Server Applications Module
openSUSE Leap
Fedora
xen-tools-debuginfo
xen-libs
xen-tools-domU
xen-debugsource
xen-tools-domU-debuginfo
xen
xen-libs-32bit
xen-libs-debuginfo-32bit
xen-devel
xen-libs-debuginfo
xen-doc-html
xen-tools
xen-libs-64bit-debuginfo
xen-libs-64bit
xen-libs-32bit-debuginfo
xen-tools-xendomains-wait-disk
xen (Debian package)

Install security update from vendor's website.

xen-tools-debuginfo - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-libs - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-tools-domU - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-debugsource - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-libs-32bit - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1
xen-libs-debuginfo-32bit - update to 4.12.4_70-3.145.1
xen-devel - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-libs-debuginfo - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-doc-html - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1
xen-tools - addressed in versions 4.12.4_70-3.145.1, 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen-libs-64bit-debuginfo - addressed in versions 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1
xen-libs-64bit - addressed in versions 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1
xen-libs-32bit-debuginfo - addressed in versions 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1
xen-tools-xendomains-wait-disk - addressed in versions 4.16.7_10-150400.4.86.2, 4.17.6_12-150500.3.73.1, 4.18.5_18-150600.3.50.1, 4.20.3_06-150700.3.41.1
xen (Debian package) - update to 4.20.3+127-gc42374a105-0+deb13u1
xen - addressed in versions 4.20.4-1.fc43, 4.21.1-4.fc44

• https://xenbits.xen.org/xsa/advisory-494.html

• Multiple vulnerabilities in Xen
• SUSE update for xen
• SUSE update for xen
• SUSE update for xen
• Fedora 44 update for xen
• SUSE update for xen
• SUSE update for xen
• Fedora 43 update for xen
• Debian update for xen