ESB-2026.5451

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.5451 Security update for dnsmasq 20 May 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: dnsmasq Publisher: SUSE Operating System: SUSE Resolution: Patch/Upgrade CVE Names: CVE-2026-2291 CVE-2026-4890 CVE-2026-4891 CVE-2026-4892 CVE-2026-4893 CVE-2026-5172 CVE-2026-6507 Original Bulletin: https://www.suse.com/support/update/announcement/2026/suse-su-202621677-1 Comment: CVSS (Max): 8.4 CVE-2026-4892 (CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) CVSS Source: SUSE Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H EPSS (Max): 0.2% (47th) CVE-2026-4890 2026-05-19 - --------------------------BEGIN INCLUDED TEXT-------------------- Security update for dnsmasq Announcement ID: SUSE-SU-2026:21677-1 Release Date: 2026-05-15T10:43:49Z Rating: important o bsc#1247812 o bsc#1257934 o bsc#1258251 o bsc#1262487 o bsc#1265001 References: o bsc#1265002 o bsc#1265003 o bsc#1265004 o bsc#1265006 o jsc#PED-266 o CVE-2026-2291 o CVE-2026-4890 o CVE-2026-4891 Cross-References: o CVE-2026-4892 o CVE-2026-4893 o CVE-2026-5172 o CVE-2026-6507 o 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 o 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 o CVE-2026-2291 ( NVD ): 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:L/A:L o CVE-2026-4890 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-4890 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-4891 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-4891 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-4892 ( SUSE ): 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/ S:U/C:H/I:H/A:H CVSS scores: o CVE-2026-4892 ( NVD ): 8.4 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/ S:U/C:H/I:H/A:H o CVE-2026-4893 ( SUSE ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-4893 ( NVD ): 5.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:N/A:N o CVE-2026-5172 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-5172 ( NVD ): 7.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:L/I:L/A:L o CVE-2026-6507 ( SUSE ): 8.7 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/ UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N o CVE-2026-6507 ( SUSE ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H o CVE-2026-6507 ( NVD ): 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/ S:U/C:N/I:N/A:H Affected o SUSE Linux Micro 6.0 Products: An update that solves seven vulnerabilities, contains one feature and has two fixes can now be installed. Description: This update for dnsmasq fixes the following issues Security issues: o CVE-2026-2291: dnsmasq can be abused to record false cached data enabling DoS or attacker redirect (bsc#1258251). o CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001). o CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC validation (bsc#1265002). o CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6 implementation (bsc#1265003). o CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks (bsc#1265004). o CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function (bsc#1265006). o CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to denial of service (bsc#1262487). Non security issues: o aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812). o Drop rcFOO symlinks for CODE16 (jsc#PED-266). o libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934). Changes for dnsmasq: o Update to security release 2.92rel2 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 SUSE Linux Micro 6.0 zypper in -t patch SUSE-SLE-Micro-6.0-709=1 Package List: o SUSE Linux Micro 6.0 (aarch64 s390x x86_64) dnsmasq-2.92rel2-1.1 dnsmasq-debuginfo-2.92rel2-1.1 References: o https://www.suse.com/security/cve/CVE-2026-2291.html o https://www.suse.com/security/cve/CVE-2026-4890.html o https://www.suse.com/security/cve/CVE-2026-4891.html o https://www.suse.com/security/cve/CVE-2026-4892.html o https://www.suse.com/security/cve/CVE-2026-4893.html o https://www.suse.com/security/cve/CVE-2026-5172.html o https://www.suse.com/security/cve/CVE-2026-6507.html o https://bugzilla.suse.com/show_bug.cgi?id=1247812 o https://bugzilla.suse.com/show_bug.cgi?id=1257934 o https://bugzilla.suse.com/show_bug.cgi?id=1258251 o https://bugzilla.suse.com/show_bug.cgi?id=1262487 o https://bugzilla.suse.com/show_bug.cgi?id=1265001 o https://bugzilla.suse.com/show_bug.cgi?id=1265002 o https://bugzilla.suse.com/show_bug.cgi?id=1265003 o https://bugzilla.suse.com/show_bug.cgi?id=1265004 o https://bugzilla.suse.com/show_bug.cgi?id=1265006 o https://jira.suse.com/browse/PED-266 - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. 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