Out-of-bounds read in Xen - CVE-2026-62430
Published: July 29, 2026
Vulnerability identifier: #VU140022
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-2026-62430
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to disclose sensitive information.
The vulnerability exists due to an out-of-bounds read in vRTC emulation when handling indirect CMOS memory index accesses. A local user can change the cached index concurrently after it has been checked to disclose sensitive information.
The disclosed data is limited to Xen data and does not include data belonging to other guests.
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 15
SUSE Linux Enterprise Server for SAP Applications 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 High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
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
xen-debugsource
xen-tools-domU
xen-libs
xen-devel
xen-libs-debuginfo-32bit
xen-libs-debuginfo
xen-libs-32bit
xen-tools-domU-debuginfo
xen-tools-debuginfo
xen-tools
xen-doc-html
xen
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 15
SUSE Linux Enterprise Server for SAP Applications 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 High Performance Computing 12
SUSE Linux Enterprise Server 12
SUSE Linux Enterprise Server for SAP Applications 12
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
xen-debugsource
xen-tools-domU
xen-libs
xen-devel
xen-libs-debuginfo-32bit
xen-libs-debuginfo
xen-libs-32bit
xen-tools-domU-debuginfo
xen-tools-debuginfo
xen-tools
xen-doc-html
xen
xen-libs-32bit-debuginfo
xen-tools-xendomains-wait-disk
xen (Debian package)
How to mitigate CVE-2026-62430
Install security update from vendor's website.
xen-debugsource - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-tools-domU - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-devel - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-debuginfo-32bit - update to 4.12.4_72-3.148.4
xen-libs-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-32bit - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen-tools-domU-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-tools-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-tools - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-doc-html - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-32bit-debuginfo - addressed in versions 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen-tools-xendomains-wait-disk - addressed in versions 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen (Debian package) - update to 4.20.3+127-gc42374a105-0+deb13u1
xen - addressed in versions 4.20.4-1.fc43, 4.21.2-1.fc44
xen-tools-domU - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-devel - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-debuginfo-32bit - update to 4.12.4_72-3.148.4
xen-libs-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-32bit - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen-tools-domU-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-tools-debuginfo - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-tools - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-doc-html - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen - addressed in versions 4.12.4_72-3.148.4, 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen-libs-32bit-debuginfo - addressed in versions 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3
xen-tools-xendomains-wait-disk - addressed in versions 4.16.7_12-150400.4.89.3, 4.17.6_14-150500.3.76.3, 4.18.5_20-150600.3.53.3, 4.20.4_04-150700.3.46.1
xen (Debian package) - update to 4.20.3+127-gc42374a105-0+deb13u1
xen - addressed in versions 4.20.4-1.fc43, 4.21.2-1.fc44