SUSE-SU-2026:4942-1: important: Security update for xen

Fri Oct 30 08:31:23 UTC 2026

# Security update for xen

Announcement ID: SUSE-SU-2026:4942-1  
Release Date: 2026-10-29T16:29:03Z  
Rating: important  
References:

  * bsc#1283317
  * bsc#1283321
  * bsc#1283322
  * bsc#1283323
  * bsc#1283325

Cross-References:

  * CVE-2026-102700
  * CVE-2026-79608
  * CVE-2026-79609
  * CVE-2026-79610
  * CVE-2026-79611

CVSS scores:

  * CVE-2026-102700 ( SUSE ):  5.7
    CVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-102700 ( SUSE ):  4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-102700 ( NVD ):  4.7 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-79608 ( 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
  * CVE-2026-79608 ( SUSE ):  7.0 CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-79608 ( NVD ):  9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
  * CVE-2026-79609 ( SUSE ):  9.3
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  * CVE-2026-79609 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-79609 ( NVD ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-79610 ( SUSE ):  9.3
    CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
  * CVE-2026-79610 ( SUSE ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-79610 ( NVD ):  8.8 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
  * CVE-2026-79611 ( SUSE ):  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-2026-79611 ( SUSE ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-79611 ( NVD ):  5.5 CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products:

  * Basesystem Module 15-SP7
  * Server Applications Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

An update that solves five vulnerabilities can now be installed.

## Description:

This update for xen fixes the following issues:

  * CVE-2026-79608: x86/AMD: ineffectual Zenbleed workaround (bsc#1283317).
  * CVE-2026-79609: x86: XPTI may break on huge-memory systems (bsc#1283321).
  * CVE-2026-79610: grant-table: double version change race (bsc#1283322).
  * CVE-2026-79611: VMX: VMentry failure with branch tracing and blocked states
    (bsc#1283323).
  * CVE-2026-102700: gnttab: cache-flush handling may cause page reference leak
    (bsc#1283325).

## Special Instructions and Notes:

  * 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:

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-4942

  * Server Applications Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Server-Applications-15-SP7-2026-4942

## Package List:

  * Basesystem Module 15-SP7 (x86_64)
    * xen-tools-domU-debuginfo-4.20.4_06-150700.3.49.2
    * xen-tools-domU-4.20.4_06-150700.3.49.2
    * xen-debugsource-4.20.4_06-150700.3.49.2
    * xen-libs-4.20.4_06-150700.3.49.2
    * xen-libs-debuginfo-4.20.4_06-150700.3.49.2
  * Server Applications Module 15-SP7 (x86_64)
    * xen-4.20.4_06-150700.3.49.2
    * xen-debugsource-4.20.4_06-150700.3.49.2
    * xen-devel-4.20.4_06-150700.3.49.2
    * xen-tools-4.20.4_06-150700.3.49.2
    * xen-tools-debuginfo-4.20.4_06-150700.3.49.2
  * Server Applications Module 15-SP7 (noarch)
    * xen-tools-xendomains-wait-disk-4.20.4_06-150700.3.49.2

## References:

  * https://www.suse.com/security/cve/CVE-2026-102700.html
  * https://www.suse.com/security/cve/CVE-2026-79608.html
  * https://www.suse.com/security/cve/CVE-2026-79609.html
  * https://www.suse.com/security/cve/CVE-2026-79610.html
  * https://www.suse.com/security/cve/CVE-2026-79611.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1283317
  * https://bugzilla.suse.com/show_bug.cgi?id=1283321
  * https://bugzilla.suse.com/show_bug.cgi?id=1283322
  * https://bugzilla.suse.com/show_bug.cgi?id=1283323
  * https://bugzilla.suse.com/show_bug.cgi?id=1283325

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