Ubuntu alert USN-7836-1 (bind9)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-7836-1] Bind vulnerabilities
Date:
             
 
Wed, 22 Oct 2025 20:08:25 +0000
Message-ID:
             
 
<E1vBf8D-0000xx-62@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-7836-1
October 22, 2025

bind9 vulnerabilities
==========================================================================

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

- Ubuntu 25.10
- Ubuntu 25.04
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain
malformed DNSKEY records. A remote attacker could possibly use this issue
to cause Bind to consume resources, resulting in a denial of service.
(CVE-2025-8677)

Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind
incorrectly accepted certain records from answers. A remote attacker could
possibly use this issue to perform a cache poisoning attack.
(CVE-2025-40778)

Amit Klein and Omer Ben Simhon discovered that Bind used a weak PRNG. A
remote attacker could possibly use this issue to perform a cache poisoning
attack. (CVE-2025-40780)

Update instructions:

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

Ubuntu 25.10
  bind9                           1:9.20.11-1ubuntu2.1

Ubuntu 25.04
  bind9                           1:9.20.11-0ubuntu0.2

Ubuntu 24.04 LTS
  bind9                           1:9.18.39-0ubuntu0.24.04.2

Ubuntu 22.04 LTS
  bind9                           1:9.18.39-0ubuntu0.22.04.2

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

References:
  https://ubuntu.com/security/notices/USN-7836-1
  CVE-2025-40778, CVE-2025-40780, CVE-2025-8677

Package Information:
  https://launchpad.net/ubuntu/+source/bind9/1:9.20.11-1ubu...
  https://launchpad.net/ubuntu/+source/bind9/1:9.20.11-0ubu...
  https://launchpad.net/ubuntu/+source/bind9/1:9.18.39-0ubu...
  https://launchpad.net/ubuntu/+source/bind9/1:9.18.39-0ubu...


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