Memory leak in Xen - CVE-2026-62437
Published: September 8, 2026
Vulnerability identifier: #VU147399
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-2026-62437
CWE-ID: CWE-401
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 cleanup of IRQ tracking structures in Xen's PCI device and IRQ cleanup handling when an HVM guest with assigned PCI devices is being terminated. A local user can cause the device model to bind IRQs anew during guest termination to cause a denial of service.
Affected software
Xen
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Basesystem Module
Server Applications Module
openSUSE Leap
Fedora
xen-libs-debuginfo-32bit
xen-libs
xen-tools-domU-debuginfo
xen-libs-debuginfo
xen-debugsource
xen
xen-tools-domU
xen-doc-html
xen-tools
xen-libs-32bit
xen-tools-debuginfo
xen-devel
xen-tools-xendomains-wait-disk
xen-libs-32bit-debuginfo
xen (Debian package)
SUSE Linux Enterprise Server 12 SP5 LTSS Extended
Debian Linux
SUSE Linux Enterprise Server for SAP Applications 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Desktop 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise Micro for Rancher
SUSE Linux Enterprise Micro
Basesystem Module
Server Applications Module
openSUSE Leap
Fedora
xen-libs-debuginfo-32bit
xen-libs
xen-tools-domU-debuginfo
xen-libs-debuginfo
xen-debugsource
xen
xen-tools-domU
xen-doc-html
xen-tools
xen-libs-32bit
xen-tools-debuginfo
xen-devel
xen-tools-xendomains-wait-disk
xen-libs-32bit-debuginfo
xen (Debian package)
How to mitigate CVE-2026-62437
Install security update from vendor's website.
xen-libs-debuginfo-32bit - update to 4.12.4_74-3.151.1
xen-libs - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-debugsource - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-domU - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-doc-html - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen-tools - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-32bit - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen-tools-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-devel - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-xendomains-wait-disk - addressed in versions 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-32bit-debuginfo - addressed in versions 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen - update to 4.20.4-2.fc43
xen (Debian package) - update to 4.20.4+39-gf1e1321c87-0+deb13u1
xen-libs - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-domU-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-debugsource - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-domU - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-doc-html - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen-tools - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-32bit - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen-tools-debuginfo - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-devel - addressed in versions 4.12.4_74-3.151.1, 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-tools-xendomains-wait-disk - addressed in versions 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1, 4.20.4_04-150700.3.46.1
xen-libs-32bit-debuginfo - addressed in versions 4.16.7_14-150400.4.92.1, 4.17.6_16-150500.3.79.1
xen - update to 4.20.4-2.fc43
xen (Debian package) - update to 4.20.4+39-gf1e1321c87-0+deb13u1