USN-8308-1

It was discovered that Dnsmasq incorrectly handled BOOTREPLY packets when configured with the --dhcp-split-relay option. A remote attacker could use this issue to cause Dnsmasq to crash, resulting in a denial of service, or possibly execute arbitrary code.

References

Affected packages

Ubuntu:26.04:LTS / dnsmasq

Package

Name: dnsmasq
Purl: pkg:deb/ubuntu/dnsmasq?arch=source&distro=resolute

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

2.92-1ubuntu0.3

Affected versions

2.*

2.91-1build1

2.92~rc3-1

2.92-1

2.92-1ubuntu0.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_version": "2.92-1ubuntu0.3",
            "binary_name": "dnsmasq"
        },
        {
            "binary_version": "2.92-1ubuntu0.3",
            "binary_name": "dnsmasq-base"
        },
        {
            "binary_version": "2.92-1ubuntu0.3",
            "binary_name": "dnsmasq-base-lua"
        },
        {
            "binary_version": "2.92-1ubuntu0.3",
            "binary_name": "dnsmasq-utils"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:26.04: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-2026-6507"
        }
    ]
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8308-1.json"