USN-7836-2

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)

References

Affected packages

Ubuntu:Pro:20.04:LTS / bind9

Package

Name: bind9
Purl: pkg:deb/ubuntu/bind9@1:9.18.30-0ubuntu0.20.04.2+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1:9.18.30-0ubuntu0.20.04.2+esm1

Affected versions

1:9.*

1:9.11.5.P4+dfsg-5.1ubuntu2

1:9.11.5.P4+dfsg-5.1ubuntu3

1:9.11.5.P4+dfsg-5.1ubuntu4

1:9.11.5.P4+dfsg-5.1ubuntu5

1:9.11.14+dfsg-1ubuntu1

1:9.11.14+dfsg-3ubuntu1

1:9.16.0-1ubuntu3

1:9.16.0-1ubuntu4

1:9.16.0-1ubuntu5

1:9.16.1-0ubuntu1

1:9.16.1-0ubuntu2

1:9.16.1-0ubuntu2.1

1:9.16.1-0ubuntu2.2

1:9.16.1-0ubuntu2.3

1:9.16.1-0ubuntu2.4

1:9.16.1-0ubuntu2.6

1:9.16.1-0ubuntu2.7

1:9.16.1-0ubuntu2.8

1:9.16.1-0ubuntu2.9

1:9.16.1-0ubuntu2.10

1:9.16.1-0ubuntu2.11

1:9.16.1-0ubuntu2.12

1:9.16.1-0ubuntu2.14

1:9.16.1-0ubuntu2.15

1:9.16.1-0ubuntu2.16

1:9.16.48-0ubuntu0.20.04.1

1:9.18.28-0ubuntu0.20.04.1

1:9.18.30-0ubuntu0.20.04.1

1:9.18.30-0ubuntu0.20.04.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9-dnsutils"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9-host"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9-libs"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9-utils"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "bind9utils"
        },
        {
            "binary_version": "1:9.18.30-0ubuntu0.20.04.2+esm1",
            "binary_name": "dnsutils"
        }
    ],
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:Pro:20.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2025-8677"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2025-40778"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2025-40780"
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-7836-2.json"