Improper locking in Xen - CVE-2026-42489
Published: June 9, 2026
Vulnerability identifier: #VU134007
CSH Severity: Low
CVSS v4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-42489
CWE-ID: CWE-667
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to cause a denial of service.
The vulnerability exists due to improper lock management in domctl operations when acquiring a system-wide lock for operations that may not be executed in parallel. A local user can repeatedly invoke domctl operations to cause a denial of service.
The issue can allow a less privileged entity to stall an equally or more privileged entity, potentially affecting the entire host.
Affected software
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)
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)
How to mitigate CVE-2026-42489
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
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