PT-2026-39700 · Dnsmasq+3 · Dnsmasq+3

Asim Viladi Oglu Manizada + 1 · Published 2026-05-09 · Updated 2026-06-18 · CVE-2026-4892

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions dnsmasq (affected versions not specified)

Description A heap-based out-of-bounds write in the DHCPv6 implementation allows local attackers to execute arbitrary code with root privileges by sending a crafted DHCPv6 packet. A heap-based out-of-bounds write occurs when a program writes data past the end of a memory buffer allocated on the heap, which can lead to memory corruption.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Heap Based Buffer Overflow

Weakness Enumeration

CWE-122

Related Identifiers

ALSA-2026:19158

ALSA-2026:19373

ALSA-2026:20589

CVE-2026-4892

OESA-2026-2435

OESA-2026-2436

OESA-2026-2437

OESA-2026-2438

OESA-2026-2509

OPENSUSE-SU-2026:10821-1

RHSA-2026:19158

SUSE-SU-2026:2458-1

USN-8268-1

Affected Products

Linuxmint

Rocky Linux

Ubuntu

Dnsmasq

References · 88

• https://errata.rockylinux.org/RLSA-2026:20589 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:10821-1 · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2026-4892 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4891 · Vendor Advisory
• https://errata.almalinux.org/8/ALSA-2026-20589.html · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-4892 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-4892 · Security Note
• https://access.redhat.com/errata/RHSA-2026:19158 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-20589.html · Vendor Advisory
• https://osv.dev/vulnerability/ALSA-2026:19158 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-4893 · Vendor Advisory
• https://osv.dev/vulnerability/OESA-2026-2435 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-2291 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-8268-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-2291 · Security Note