CVE-2026-3238

Name	CVE-2026-3238
Description	A flaw was found in Samba’s WINS server component when running as an Active Directory Domain Controller. The WINS protocol handlers for certain request types did not properly validate incoming packets, allowing an unauthenticated remote attacker to trigger a NULL pointer dereference and crash the WINS service using specially crafted UDP packets.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DSA-6297-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
samba (PTS)	bullseye	2:4.13.13+dfsg-1~deb11u6	vulnerable
	bullseye (security)	2:4.13.13+dfsg-1~deb11u7	vulnerable
	bookworm	2:4.17.12+dfsg-0+deb12u3	vulnerable
	bookworm (security)	2:4.17.12+dfsg-0+deb12u4	fixed
	trixie	2:4.22.8+dfsg-0+deb13u1	vulnerable
	trixie (security)	2:4.22.8+dfsg-0+deb13u2	fixed
	forky, sid	2:4.24.3+dfsg-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin
samba	source	bookworm	2:4.17.12+dfsg-0+deb12u4	DSA-6297-1
samba	source	trixie	2:4.22.8+dfsg-0+deb13u2	DSA-6297-1
samba	source	(unstable)	2:4.24.3+dfsg-1

https://www.samba.org/samba/security/CVE-2026-3238.html