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Ubuntu 26.04 LTS Dnsmasq Critical Service Disruption Vulnern 2026-6507

ubuntu
Calendar Grey May 26, 2026
Dist Ubuntu Esm H88
Dnsmasq in Ubuntu 26.04 LTS faces critical security risk from crafted traffic leading to service disruption.
Dnsmasq could be made to crash or run programs if it received specially crafted network traffic.

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.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu network attack dnsmasq

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8308-1

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu network attack dnsmasq

Package Information

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

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