Denial of service in Samba AD DC WINS server
CVE-2026-3238 is a denial-of-service vulnerability in Samba’s WINS server component when Samba is running as an Active Directory Domain Controller. The flaw affects Samba versions since 4.0 and is exposed only when WINS support is explicitly enabled via "wins support = yes" in smb.conf. According to the provided context, the vulnerable code is in the WINS protocol handlers for RELEASE and MULTI_HOME_REG request types, which do not properly validate incoming UDP packets. A remote unauthenticated attacker can send specially crafted UDP packets that trigger a NULL pointer dereference, causing the WINS service to crash.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.