Amazon Linux 2 Security Advisory: ALAS2-2026-3318
Advisory Released Date: 2026-05-26
Advisory Updated Date: 2026-05-26
Severity:
Important
Issue Overview:
A heap-based out-of-bounds write vulnerability in the DHCPv6 implementation of dnsmasq allows local attackers to execute arbitrary code with root privileges via a crafted DHCPv6 packet. (CVE-2026-4892)
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information. (CVE-2026-4893)
Affected Packages:
dnsmasq
Note:
This advisory is applicable to Amazon Linux 2 (AL2) Core repository. Visit this FAQ section for the difference between AL2 Core and AL2 Extras advisories.
Issue Correction:
Run yum update dnsmasq or yum update --advisory ALAS2-2026-3318 to update your system.
New Packages:
aarch64:
dnsmasq-2.76-16.amzn2.1.6.aarch64
dnsmasq-utils-2.76-16.amzn2.1.6.aarch64
dnsmasq-debuginfo-2.76-16.amzn2.1.6.aarch64
i686:
dnsmasq-2.76-16.amzn2.1.6.i686
dnsmasq-utils-2.76-16.amzn2.1.6.i686
dnsmasq-debuginfo-2.76-16.amzn2.1.6.i686
src:
dnsmasq-2.76-16.amzn2.1.6.src
x86_64:
dnsmasq-2.76-16.amzn2.1.6.x86_64
dnsmasq-utils-2.76-16.amzn2.1.6.x86_64
dnsmasq-debuginfo-2.76-16.amzn2.1.6.x86_64