[USN-7836-2] Bind vulnerabilities

[noreply+usn-bot at canonical.com]

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Ubuntu Security Notice USN-7836-2
November 12, 2025

bind9 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in Bind.

Software Description:
- bind9: Internet Domain Name Server

Details:

USN-7836-1 fixed vulnerabilities in Bind. This update provides the
corresponding fixes for Ubuntu 20.04 LTS.

Original advisory 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 20.04 LTS
  bind9                           1:9.18.30-0ubuntu0.20.04.2+esm1
                                  Available with Ubuntu Pro

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

References:
  https://ubuntu.com/security/notices/USN-7836-2
  https://ubuntu.com/security/notices/USN-7836-1
  CVE-2025-40778, CVE-2025-40780, CVE-2025-8677
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