xen-4.21.0_04-1.1 on GA media SUSE Patch security@suse.de SUSE Security Team openSUSE-SU-2026:10118-1 Final 1 1 2026-01-29T00:00:00Z current 2026-01-29T00:00:00Z 2026-01-29T00:00:00Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z xen-4.21.0_04-1.1 on GA media These are all security issues fixed in the xen-4.21.0_04-1.1 package on the GA media of openSUSE Tumbleweed. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). openSUSE-Tumbleweed-2026-10118 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/security/rating/ SUSE Security Ratings https://www.suse.com/security/cve/CVE-2025-58150/ SUSE CVE CVE-2025-58150 page https://www.suse.com/security/cve/CVE-2026-23553/ SUSE CVE CVE-2026-23553 page openSUSE Tumbleweed xen-4.21.0_04-1.1 xen-devel-4.21.0_04-1.1 xen-doc-html-4.21.0_04-1.1 xen-libs-4.21.0_04-1.1 xen-tools-4.21.0_04-1.1 xen-tools-domU-4.21.0_04-1.1 xen-tools-xendomains-wait-disk-4.21.0_04-1.1 xen-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-devel-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-doc-html-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-libs-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-tools-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-tools-domU-4.21.0_04-1.1 as a component of openSUSE Tumbleweed xen-tools-xendomains-wait-disk-4.21.0_04-1.1 as a component of openSUSE Tumbleweed Shadow mode tracing code uses a set of per-CPU variables to avoid cumbersome parameter passing. Some of these variables are written to with guest controlled data, of guest controllable size. That size can be larger than the variable, and bounding of the writes was missing. CVE-2025-58150 openSUSE Tumbleweed:xen-4.21.0_04-1.1 openSUSE Tumbleweed:xen-devel-4.21.0_04-1.1 openSUSE Tumbleweed:xen-doc-html-4.21.0_04-1.1 openSUSE Tumbleweed:xen-libs-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-domU-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-xendomains-wait-disk-4.21.0_04-1.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2025-58150.html CVE-2025-58150 https://bugzilla.suse.com/1256745 SUSE Bug 1256745 In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider: 1) vCPU runs on CPU A, running task 1. 2) vCPU moves to CPU B, idle gets scheduled on A. Xen skips IBPB. 3) On CPU B, guest kernel switches from task 1 to 2, issuing IBPB. 4) vCPU moves back to CPU A. Xen skips IBPB again. Now, task 2 is running on CPU A with task 1's training still in the BTB. CVE-2026-23553 openSUSE Tumbleweed:xen-4.21.0_04-1.1 openSUSE Tumbleweed:xen-devel-4.21.0_04-1.1 openSUSE Tumbleweed:xen-doc-html-4.21.0_04-1.1 openSUSE Tumbleweed:xen-libs-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-domU-4.21.0_04-1.1 openSUSE Tumbleweed:xen-tools-xendomains-wait-disk-4.21.0_04-1.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/security/cve/CVE-2026-23553.html CVE-2026-23553 https://bugzilla.suse.com/1256747 SUSE Bug 1256747