CVE-2026-6507

Dnsmasq: dnsmasq: denial of service due to out-of-bounds write in dhcp bootreply processing

CVE-2026-6507 is fixed in 8 products on 1 platform, first by dnsmasq 2.92-1ubuntu0.3, released April 17, 2026. It is not reported as exploited. Patch Radar priority: High.

High

CVSS

7.5

Important

Exploitation

None reported

No vendor assessment

CISA KEV

Not listed

Not in the Known Exploited Vulnerabilities catalog

EPSS

0.0048

41st percentile

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).

Where it's fixed

Product	Fixed in	Fix	Released
Linux
dnsmasq · Debian 14	2.92-4	DEBIAN-CVE-2026-6507	May 15, 2026
dnsmasq · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026
dnsmasq · Ubuntu 26.04.1 LTS (resolute)	2.92-1ubuntu0.3	dnsmasq 2.92-1ubuntu0.3	Apr 17, 2026
dnsmasq · opensuse-leap 16.0	2.93-160000.1.1	OPENSUSE-SU-2026:21192-1	Jun 29, 2026
dnsmasq · sles 16.0	2.93-160000.1.1	SUSE-SU-2026:22496-1	Jun 29, 2026
dnsmasq-base · Ubuntu 26.04.1 LTS (resolute)	2.92-1ubuntu0.3	dnsmasq-base 2.92-1ubuntu0.3	Apr 17, 2026
dnsmasq-base-lua · Ubuntu 26.04.1 LTS (resolute)	2.92-1ubuntu0.3	dnsmasq-base-lua 2.92-1ubuntu0.3	Apr 17, 2026
dnsmasq-debuginfo · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026
dnsmasq-debugsource · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026
dnsmasq-langpack · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026
dnsmasq-utils · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026
dnsmasq-utils · Ubuntu 26.04.1 LTS (resolute)	2.92-1ubuntu0.3	dnsmasq-utils 2.92-1ubuntu0.3	Apr 17, 2026
dnsmasq-utils-debuginfo · Fedora 43	2.92rel2-2.fc43	FEDORA-2026-6384A3CF14	May 12, 2026

Details

Published
April 17, 2026
Weakness
Out-of-bounds Write
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Vendor advisory
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-6507

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