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Ubuntu 25.04, 24.10: USN-7526-1 Critical: Bind DoS Risk

ubuntu
Calendar Grey May 21, 2025
Dist Ubuntu Esm H88
Bind on Ubuntu is susceptible to crashing due to specially crafted packets. Critical patch released for users. Take immediate action to protect your system.
Bind could be made to crash if it received specially crafted network traffic.

Summary

Bind could be made to crash if it received specially crafted network

traffic.

Software Description:

- bind9: Internet Domain Name Server

Details:

It was discovered that Bind incorrectly handled certain DNS messages with

invalid TSIG. A remote attacker could possibly use this issue to cause Bind

to crash, resulting in a denial of service.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu DNS network traffic Bind

Update Instructions

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

Ubuntu 25.04
   bind9                           1:9.20.4-3ubuntu1.1

Ubuntu 24.10
   bind9                           1:9.20.0-2ubuntu3.2

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

References

https://ubuntu.com/security/notices/USN-7526-1

CVE-2025-40775

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-7526-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu DNS network traffic Bind

Package Information

https://launchpad.net/ubuntu/+source/bind9/1:9.20.4-3ubuntu1.1
https://launchpad.net/ubuntu/+source/bind9/1:9.20.0-2ubuntu3.2

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