Ubuntu alert USN-8124-1 (bind9)

From:
             
 
noreply+usn-bot@canonical.com
To:
             
 
ubuntu-security-announce@lists.ubuntu.com
Subject:
             
 
[USN-8124-1] Bind vulnerabilities
Date:
             
 
Wed, 25 Mar 2026 18:13:38 +0000
Message-ID:
             
 
<E1w5Sja-0006e2-0j@lists.ubuntu.com>
==========================================================================
Ubuntu Security Notice USN-8124-1
March 25, 2026

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

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

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

Samy Medjahed discovered that Bind incorrectly handled insecure
delegation validation. A remote attacker could possibly use this issue to
cause excessive NSEC3 iterations, consuming CPU resources, and leading to a
denial of service. (CVE-2026-1519)

Vitaly Simonovich discovered that Bind incorrectly handled memory when
preparing DNSSEC proofs of non-existence. A remote attacker could possibly
use this issue to cause memory consumption, leading to a denial of service.
This issue only affected Ubuntu 25.10. (CVE-2026-3104)

Vitaly Simonovich discovered that Bind incorrectly handled authenticated
queries containing TKEY records. A remote attacker could possibly use this
issue to cause Bind to crash, resulting in a denial of service. This issue
only affected Ubuntu 25.10. (CVE-2026-3119)

It was discovered that Bind incorrectly handled DNS queries signed with
SIG(0). A remote attacker could possibly use this issue to bypass ACLs.
This issue only affected Ubuntu 25.10. (CVE-2026-3591)

Update instructions:

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

Ubuntu 25.10
  bind9                           1:9.20.11-1ubuntu2.2

Ubuntu 24.04 LTS
  bind9                           1:9.18.39-0ubuntu0.24.04.3

Ubuntu 22.04 LTS
  bind9                           1:9.18.39-0ubuntu0.22.04.3

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

References:
  https://ubuntu.com/security/notices/USN-8124-1
  CVE-2026-1519, CVE-2026-3104, CVE-2026-3119, CVE-2026-3591

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