ESB-2026.4840

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4840 Security update for xen 8 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: xen Publisher: SUSE Operating System: SUSE Resolution: Patch/Upgrade CVE Names: CVE-2026-23558 CVE-2026-23557 CVE-2025-54505 Original Bulletin: https://www.suse.com/support/update/announcement/2026/suse-su-20261743-1 Comment: CVSS (Max): 7.8 CVE-2026-23558 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H) CVSS Source: SUSE Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H EPSS (Max): 0.0% (1st)* CVE-2025-54505 2026-05-07 * Not all EPSS found when published - --------------------------BEGIN INCLUDED TEXT-------------------- Security update for xen Announcement ID: SUSE-SU-2026:1743-1 Release Date: 2026-05-07T07:15:57Z Rating: important o bsc#1027519 o bsc#1262178 References: o bsc#1262180 o bsc#1262428 o jsc#PED-8907 o CVE-2025-54505 Cross-References: o CVE-2026-23557 o CVE-2026-23558 o CVE-2025-54505 ( SUSE ): 6.9 CVSS:4.0/AV:L/AC:H/AT:P/PR:N /UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N o CVE-2025-54505 ( SUSE ): 5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N /S:U/C:H/I:N/A:N o CVE-2025-54505 ( NVD ): 2.0 CVSS:4.0/AV:L/AC:L/AT:P/PR:L/ UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/ MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/ CVSS scores: MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X o CVE-2026-23557 ( SUSE ): 6.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N /S:C/C:N/I:N/A:H o CVE-2026-23558 ( SUSE ): 7.3 CVSS:4.0/AV:L/AC:H/AT:N/PR:L /UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N o CVE-2026-23558 ( SUSE ): 7.8 CVSS:3.1/AV:L/AC:H/PR:L/UI:N /S:C/C:H/I:H/A:H o Basesystem Module 15-SP7 o Server Applications Module 15-SP7 Affected o SUSE Linux Enterprise Desktop 15 SP7 Products: o SUSE Linux Enterprise Real Time 15 SP7 o SUSE Linux Enterprise Server 15 SP7 o SUSE Linux Enterprise Server for SAP Applications 15 SP7 An update that solves three vulnerabilities, contains one feature and has one security fix can now be installed. Description: This update for xen fixes the following issues: o Update to Xen 4.20.3 bug fix release (bsc#1027519) (jsc#PED-8907). o CVE-2025-54505: Floating Point Divider State Sampling on AMD CPUs AMD-SN-7053 (bsc#1262428). o CVE-2026-23557: Xenstored DoS via XS_RESET_WATCHES command (bsc#1262178). o CVE-2026-23558: grant table v2 race in status page mapping (bsc#1262180). Special Instructions and Notes: o Please reboot the system after installing this update. Patch Instructions: To install this SUSE update use the SUSE recommended installation methods like YaST online_update or "zypper patch". Alternatively you can run the command listed for your product: o Basesystem Module 15-SP7 zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-1743=1 o Server Applications Module 15-SP7 zypper in -t patch SUSE-SLE-Module-Server-Applications-15-SP7-2026-1743=1 Package List: o Basesystem Module 15-SP7 (x86_64) xen-libs-debuginfo-4.20.3_02-150700.3.33.1 xen-debugsource-4.20.3_02-150700.3.33.1 xen-tools-domU-4.20.3_02-150700.3.33.1 xen-tools-domU-debuginfo-4.20.3_02-150700.3.33.1 xen-libs-4.20.3_02-150700.3.33.1 o Server Applications Module 15-SP7 (x86_64) xen-tools-4.20.3_02-150700.3.33.1 xen-4.20.3_02-150700.3.33.1 xen-debugsource-4.20.3_02-150700.3.33.1 xen-tools-debuginfo-4.20.3_02-150700.3.33.1 xen-devel-4.20.3_02-150700.3.33.1 o Server Applications Module 15-SP7 (noarch) xen-tools-xendomains-wait-disk-4.20.3_02-150700.3.33.1 References: o https://www.suse.com/security/cve/CVE-2025-54505.html o https://www.suse.com/security/cve/CVE-2026-23557.html o https://www.suse.com/security/cve/CVE-2026-23558.html o https://bugzilla.suse.com/show_bug.cgi?id=1027519 o https://bugzilla.suse.com/show_bug.cgi?id=1262178 o https://bugzilla.suse.com/show_bug.cgi?id=1262180 o https://bugzilla.suse.com/show_bug.cgi?id=1262428 o https://jira.suse.com/browse/PED-8907 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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