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
Downstream
Related
Published
2026-04-17T13:16:00Z
Modified
2026-05-26T20:00:13.783860459Z
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
Fixed
2.92-1ubuntu0.3

Affected versions

2.*
2.91-1build1
2.92~rc3-1
2.92-1
2.92-1ubuntu0.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "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"
        }
    ]
}

Database specific

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