Security update for xen SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2026:0589-1 Final 1 1 2026-02-20T10:05:27Z current 2026-02-20T10:05:27Z 2026-02-20T10:05:27Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for xen This update for xen fixes the following issues: - CVE-2025-58150: buffer overrun with shadow paging + tracing (XSA-477) (bsc#1256745). - CVE-2026-23553: incomplete IBPB for vCPU isolation (XSA-479) (bsc#1256747). The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). Image SLES15-SP7-BYOS-EC2-2026-589,Image SLES15-SP7-Hardened-BYOS-EC2-2026-589,SUSE-2026-589,SUSE-SLE-Module-Basesystem-15-SP7-2026-589,SUSE-SLE-Module-Server-Applications-15-SP7-2026-589 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2026/suse-su-20260589-1/ Link for SUSE-SU-2026:0589-1 https://lists.suse.com/pipermail/sle-security-updates/2026-February/024358.html E-Mail link for SUSE-SU-2026:0589-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1027519 SUSE Bug 1027519 https://bugzilla.suse.com/1256745 SUSE Bug 1256745 https://bugzilla.suse.com/1256747 SUSE Bug 1256747 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 Image SLES15-SP7-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-EC2 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP7 xen-libs-4.20.2_06-150700.3.25.1 xen-tools-domU-4.20.2_06-150700.3.25.1 xen-4.20.2_06-150700.3.25.1 xen-devel-4.20.2_06-150700.3.25.1 xen-doc-html-4.20.2_06-150700.3.25.1 xen-libs-32bit-4.20.2_06-150700.3.25.1 xen-libs-64bit-4.20.2_06-150700.3.25.1 xen-tools-4.20.2_06-150700.3.25.1 xen-tools-xendomains-wait-disk-4.20.2_06-150700.3.25.1 xen-libs-4.20.2_06-150700.3.25.1 as a component of Image SLES15-SP7-BYOS-EC2 xen-tools-domU-4.20.2_06-150700.3.25.1 as a component of Image SLES15-SP7-BYOS-EC2 xen-libs-4.20.2_06-150700.3.25.1 as a component of Image SLES15-SP7-Hardened-BYOS-EC2 xen-tools-domU-4.20.2_06-150700.3.25.1 as a component of Image SLES15-SP7-Hardened-BYOS-EC2 xen-libs-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 xen-tools-domU-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 xen-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 xen-devel-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 xen-tools-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 xen-tools-xendomains-wait-disk-4.20.2_06-150700.3.25.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 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 Image SLES15-SP7-BYOS-EC2:xen-libs-4.20.2_06-150700.3.25.1 Image SLES15-SP7-BYOS-EC2:xen-tools-domU-4.20.2_06-150700.3.25.1 Image SLES15-SP7-Hardened-BYOS-EC2:xen-libs-4.20.2_06-150700.3.25.1 Image SLES15-SP7-Hardened-BYOS-EC2:xen-tools-domU-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:xen-libs-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:xen-tools-domU-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-devel-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-tools-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-tools-xendomains-wait-disk-4.20.2_06-150700.3.25.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-20260589-1/ 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 Image SLES15-SP7-BYOS-EC2:xen-libs-4.20.2_06-150700.3.25.1 Image SLES15-SP7-BYOS-EC2:xen-tools-domU-4.20.2_06-150700.3.25.1 Image SLES15-SP7-Hardened-BYOS-EC2:xen-libs-4.20.2_06-150700.3.25.1 Image SLES15-SP7-Hardened-BYOS-EC2:xen-tools-domU-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:xen-libs-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:xen-tools-domU-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-devel-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-tools-4.20.2_06-150700.3.25.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:xen-tools-xendomains-wait-disk-4.20.2_06-150700.3.25.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2026/suse-su-20260589-1/ https://www.suse.com/security/cve/CVE-2026-23553.html CVE-2026-23553 https://bugzilla.suse.com/1256747 SUSE Bug 1256747