NULL pointer dereference in Red Hat Enterprise Linux 10

CVE-2026-3238

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.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.020 (80.2th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 80th percentile — 80.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-3238: fell from 0.027 to 0.020.

EPSS over last 30 days · oldest: 0.027 · newest: 0.020 · change: -0.006

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-3238?
CVE-2026-3238 is a high-severity vulnerability in Red Hat Enterprise Linux 10, classified under NULL Pointer Dereference. CVSS score: 7.5/10. Published 2026-06-08.
How severe is CVE-2026-3238?
High severity. CVSS v3 base score is 7.5 out of 10.