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[USN-8308-1] Dnsmasq vulnerability

Posted on 26 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8308-1
May 26, 2026

dnsmasq vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

Dnsmasq could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- dnsmasq: Small caching DNS proxy and DHCP/TFTP server

Details:

It was discovered that Dnsmasq incorrectly handled BOOTREPLY packets when
configured with the --dhcp-split-relay option. A remote attacker could
use this issue to cause Dnsmasq to crash, resulting in a denial of
service, or possibly execute arbitrary code.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
dnsmasq 2.92-1ubuntu0.3

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8308-1
CVE-2026-6507

Package Information:
https://launchpad.net/ubuntu/+source/dnsmasq/2.92-1ubuntu0.3

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