Summary
Package updates are available for Amazon Linux 2 that fix the following vulnerabilities: CVE-2026-4893: 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-2026-4892: 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.
Fixed packages 3
| Release | Package | Fixed in |
|---|---|---|
| Amazon Linux · 2 | dnsmasq | 0:2.76-16.amzn2.1.6 |
| Amazon Linux · 2 | dnsmasq-debuginfo | 0:2.76-16.amzn2.1.6 |
| Amazon Linux · 2 | dnsmasq-utils | 0:2.76-16.amzn2.1.6 |
Vulnerabilities 2
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High 8.4
CVE-2026-4892
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.
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Medium 5.3CVE-2026-4893 Public exploit
CVE-2026-4893
An information disclosure vulnerability in dnsmasq allows remote attackers to bypass source checks via a crafted DNS packet with RFC 7871 client subnet information.