SUSE-SU-2026:21640-1: important: Security update for dnsmasq

Fri May 15 12:30:45 UTC 2026

# Security update for dnsmasq

Announcement ID: SUSE-SU-2026:21640-1  
Release Date: 2026-05-13T16:33:13Z  
Rating: important  
References:

  * bsc#1235517
  * bsc#1235834
  * bsc#1247812
  * bsc#1257934
  * bsc#1258251
  * bsc#1262487
  * bsc#1265001
  * bsc#1265002
  * bsc#1265003
  * bsc#1265004
  * bsc#1265006
  * jsc#PED-266

Cross-References:

  * CVE-2026-2291
  * CVE-2026-4890
  * CVE-2026-4891
  * CVE-2026-4892
  * CVE-2026-4893
  * CVE-2026-5172
  * CVE-2026-6507

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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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
  * 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 Products:

  * SUSE Linux Micro 6.2

An update that solves seven vulnerabilities, contains one feature and has four
fixes can now be installed.

## Description:

This update for dnsmasq fixes the following issues

Security issues:

  * CVE-2026-2291: dnsmasq can be abused to record false cached data enabling
    DoS or attacker redirect (bsc#1258251).
  * CVE-2026-4890: DoS vulnerability in the DNSSEC validation (bsc#1265001).
  * CVE-2026-4891: heap-based out-of-bounds read vulnerability in the DNSSEC
    validation (bsc#1265002).
  * CVE-2026-4892: heap-based out-of-bounds write vulnerability in the DHCPv6
    implementation (bsc#1265003).
  * CVE-2026-4893: information disclosure vulnerability in dnsmasq allows remote
    attackers to bypass source checks (bsc#1265004).
  * CVE-2026-5172: buffer overflow in dnsmasq's extract_addresses() function
    (bsc#1265006).
  * CVE-2026-6507: out-of-bounds write in DHCP BOOTREPLY processing can lead to
    denial of service (bsc#1262487).

Non security issues:

  * aardvark-dns upstream tests make dnsmasq dump core (bsc#1247812).
  * Drop rcFOO symlinks for CODE16 (jsc#PED-266.
  * libnettle: update to 4.0 breaks dnsmasq and gnutls (bsc#1257934).
  * unknown user or group: dnsmasq with latest proposed dnsmasq update when
    doing virsh net-start (bsc#1235517).
  * 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:

  * SUSE Linux Micro 6.2  
    zypper in -t patch SUSE-SL-Micro-6.2-742=1

## Package List:

  * SUSE Linux Micro 6.2 (aarch64 ppc64le s390x x86_64)
    * dnsmasq-debuginfo-2.92rel2-160000.1.1
    * dnsmasq-2.92rel2-160000.1.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-2291.html
  * https://www.suse.com/security/cve/CVE-2026-4890.html
  * https://www.suse.com/security/cve/CVE-2026-4891.html
  * https://www.suse.com/security/cve/CVE-2026-4892.html
  * https://www.suse.com/security/cve/CVE-2026-4893.html
  * https://www.suse.com/security/cve/CVE-2026-5172.html
  * https://www.suse.com/security/cve/CVE-2026-6507.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1235517
  * https://bugzilla.suse.com/show_bug.cgi?id=1235834
  * https://bugzilla.suse.com/show_bug.cgi?id=1247812
  * https://bugzilla.suse.com/show_bug.cgi?id=1257934
  * https://bugzilla.suse.com/show_bug.cgi?id=1258251
  * https://bugzilla.suse.com/show_bug.cgi?id=1262487
  * https://bugzilla.suse.com/show_bug.cgi?id=1265001
  * https://bugzilla.suse.com/show_bug.cgi?id=1265002
  * https://bugzilla.suse.com/show_bug.cgi?id=1265003
  * https://bugzilla.suse.com/show_bug.cgi?id=1265004
  * https://bugzilla.suse.com/show_bug.cgi?id=1265006
  * https://jira.suse.com/browse/PED-266

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