Security update for dnsmasq

Announcement ID:	SUSE-SU-2026:1827-1
Release Date:	2026-05-12T09:06:53Z
Rating:	important
References:	bsc#1258251
Cross-References:	CVE-2026-2291
CVSS scores:	CVE-2026-2291 ( SUSE ): 9.2 CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVE-2026-2291 ( SUSE ): 8.1 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Affected Products:	Basesystem Module 15-SP7 openSUSE Leap 15.4 openSUSE Leap 15.6 SUSE Linux Enterprise Desktop 15 SP7 SUSE Linux Enterprise High Performance Computing 15 SP4 SUSE Linux Enterprise High Performance Computing 15 SP5 SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 SUSE Linux Enterprise Micro 5.3 SUSE Linux Enterprise Micro 5.4 SUSE Linux Enterprise Micro 5.5 SUSE Linux Enterprise Micro for Rancher 5.3 SUSE Linux Enterprise Micro for Rancher 5.4 SUSE Linux Enterprise Real Time 15 SP7 SUSE Linux Enterprise Server 15 SP4 SUSE Linux Enterprise Server 15 SP4 LTSS SUSE Linux Enterprise Server 15 SP5 SUSE Linux Enterprise Server 15 SP5 LTSS SUSE Linux Enterprise Server 15 SP6 SUSE Linux Enterprise Server 15 SP6 LTSS SUSE Linux Enterprise Server 15 SP7 SUSE Linux Enterprise Server for SAP Applications 15 SP4 SUSE Linux Enterprise Server for SAP Applications 15 SP5 SUSE Linux Enterprise Server for SAP Applications 15 SP6 SUSE Linux Enterprise Server for SAP Applications 15 SP7

An update that solves one vulnerability can now be installed.

Description:

This update for dnsmasq fixes the following issue:

• CVE-2026-2291: VU#471747: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251).

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:

• openSUSE Leap 15.4
  zypper in -t patch SUSE-2026-1827=1
• openSUSE Leap 15.6
  zypper in -t patch openSUSE-SLE-15.6-2026-1827=1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-ESPOS-2026-1827=1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP5
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP5-LTSS-2026-1827=1
• SUSE Linux Enterprise Server 15 SP4 LTSS
  zypper in -t patch SUSE-SLE-Product-SLES-15-SP4-LTSS-2026-1827=1
• SUSE Linux Enterprise Server 15 SP5 LTSS
  zypper in -t patch SUSE-SLE-Product-SLES-15-SP5-LTSS-2026-1827=1
• SUSE Linux Enterprise Micro for Rancher 5.3
  zypper in -t patch SUSE-SLE-Micro-5.3-2026-1827=1
• SUSE Linux Enterprise Micro 5.3
  zypper in -t patch SUSE-SLE-Micro-5.3-2026-1827=1
• SUSE Linux Enterprise Micro for Rancher 5.4
  zypper in -t patch SUSE-SLE-Micro-5.4-2026-1827=1
• SUSE Linux Enterprise Micro 5.4
  zypper in -t patch SUSE-SLE-Micro-5.4-2026-1827=1
• SUSE Linux Enterprise Micro 5.5
  zypper in -t patch SUSE-SLE-Micro-5.5-2026-1827=1
• Basesystem Module 15-SP7
  zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2026-1827=1
• SUSE Linux Enterprise Server 15 SP6 LTSS
  zypper in -t patch SUSE-SLE-Product-SLES-15-SP6-LTSS-2026-1827=1
• SUSE Linux Enterprise Server for SAP Applications 15 SP4
  zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP4-2026-1827=1
• SUSE Linux Enterprise Server for SAP Applications 15 SP5
  zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP5-2026-1827=1
• SUSE Linux Enterprise Server for SAP Applications 15 SP6
  zypper in -t patch SUSE-SLE-Product-SLES_SAP-15-SP6-2026-1827=1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-ESPOS-2026-1827=1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP4
  zypper in -t patch SUSE-SLE-Product-HPC-15-SP4-LTSS-2026-1827=1

Package List:

• openSUSE Leap 15.4 (aarch64 ppc64le s390x x86_64 i586)
  • dnsmasq-utils-debuginfo-2.90-150400.16.9.1
  • dnsmasq-utils-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64)
  • dnsmasq-utils-debuginfo-2.90-150400.16.9.1
  • dnsmasq-utils-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP5 (aarch64 x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP5 (aarch64 x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server 15 SP4 LTSS (aarch64 ppc64le s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server 15 SP5 LTSS (aarch64 ppc64le s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Micro for Rancher 5.3 (aarch64 s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Micro 5.3 (aarch64 s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Micro for Rancher 5.4 (aarch64 s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Micro 5.4 (aarch64 s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Micro 5.5 (aarch64 ppc64le s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server 15 SP6 LTSS (aarch64 ppc64le s390x x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server for SAP Applications 15 SP4 (ppc64le x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server for SAP Applications 15 SP5 (ppc64le x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise Server for SAP Applications 15 SP6 (ppc64le x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise High Performance Computing ESPOS 15 SP4 (aarch64 x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1
• SUSE Linux Enterprise High Performance Computing LTSS 15 SP4 (aarch64 x86_64)
  • dnsmasq-debuginfo-2.90-150400.16.9.1
  • dnsmasq-2.90-150400.16.9.1
  • dnsmasq-debugsource-2.90-150400.16.9.1

References:

• https://www.suse.com/security/cve/CVE-2026-2291.html
• https://bugzilla.suse.com/show_bug.cgi?id=1258251