UBUNTU-CVE-2026-6507

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Source

https://ubuntu.com/security/CVE-2026-6507

Import Source

https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6507.json

JSON Data

https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-6507

Upstream

CVE-2026-6507

Published

2026-04-17T13:16:00Z

Modified

2026-05-22T18:45:05.925245165Z

Severity

7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Ubuntu - medium

Summary

[none]

Details

A flaw was found in dnsmasq. A remote attacker could exploit an out-of-bounds write vulnerability by sending a specially crafted BOOTREPLY (Bootstrap Protocol Reply) packet to a dnsmasq server configured with the --dhcp-split-relay option. This can lead to memory corruption, causing the dnsmasq daemon to crash and resulting in a denial of service (DoS).

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

Affected versions

2.*

2.91-1build1

2.92~rc3-1

2.92-1

2.92-1ubuntu0.2

Ecosystem specific

{
    "binaries": [
        {
            "binary_name": "dnsmasq",
            "binary_version": "2.92-1ubuntu0.2"
        },
        {
            "binary_name": "dnsmasq-base",
            "binary_version": "2.92-1ubuntu0.2"
        },
        {
            "binary_name": "dnsmasq-base-lua",
            "binary_version": "2.92-1ubuntu0.2"
        },
        {
            "binary_name": "dnsmasq-utils",
            "binary_version": "2.92-1ubuntu0.2"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-6507.json"