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Fencer Vulns
high 7.5

CVE-2026-3238 json

Samba: denial of service against ad dc wins server

published 2026-06-08 5 mo ago modified 2026-09-01 2 mo ago also EUVD-2026-35033

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 85%
public exploits
0
none known

Summary

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.

Patch / fix

  • samba Debian 12 2:4.17.12+dfsg-0+deb12u4
  • samba Debian 13 2:4.22.8+dfsg-0+deb13u2
  • samba Debian 14 2:4.24.3+dfsg-1

debian advisories DEBIAN-CVE-2026-3238

  • samba Ubuntu 22.04 LTS 2:4.15.13+dfsg-0ubuntu1.12
  • samba Ubuntu 24.04 LTS 2:4.19.5+dfsg-4ubuntu9.6
  • samba Ubuntu 25.10 2:4.22.3+dfsg-4ubuntu2.4
  • samba Ubuntu 26.04 LTS 2:4.23.6+dfsg-1ubuntu2.1
  • samba Ubuntu Pro 20.04 LTS 2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2

ubuntu advisories UBUNTU-CVE-2026-3238

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • samba SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.22.11+git.552.66cfeb7de0a-160000.1.1
  • samba SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 4.22.9+git.506.22c03ce0781-160000.1.1

suse advisories SUSE-SU-2026:23003-1SUSE-SU-2026:23129-1SUSE-SU-2026:23152-1SUSE-SU-2026:22045-1SUSE-SU-2026:22080-1

  • samba openSUSE Leap 16.0 4.22.11+git.552.66cfeb7de0a-160000.1.1
  • samba openSUSE Leap 16.0 4.22.9+git.506.22c03ce0781-160000.1.1
  • samba openSUSE Tumbleweed 4.23.8+git.477.f78166bceed-1.1

opensuse advisories openSUSE-SU-2026:21540-1openSUSE-SU-2026:20905-1openSUSE-SU-2026:10884-1

  • samba Alpine 3.23 4.22.10-r0
  • samba Alpine 3.24 4.23.8-r0

alpine advisories ALPINE-CVE-2026-3238

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-3238 updated cvss 7.5

samba: Denial of service against AD DC WINS server

  • Red Hat Enterprise Linux 6 samba, samba4, samba4-dc, samba-swat, samba4-libs, samba4-pidl, +17 more Red Hat Enterprise Linux 7 ctdb, samba, samba-dc, ctdb-tests, samba-libs, samba-pidl, +18 more Red Hat Enterprise Linux 8 ctdb, samba, libnetapi, ctdb-tests, samba-libs, samba-pidl, +24 more Red Hat Enterprise Linux 9 ctdb, samba, libldb, ldb-tools, libnetapi, samba-libs, +27 more Red Hat Enterprise Linux 10 samba Red Hat OpenShift Container Platform 4 openshift/ose-rhel-coreos-8, openshift/ose-rhel-coreos-9
    +1 more products
    Red Hat OpenShift Container Platform 5 openshift/ose-rhel-coreos-9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

2.67% chance of exploitation in the next 30 days, higher than 85% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

  • Red Hat Red Hat Enterprise Linux 10
  • Red Hat Red Hat Enterprise Linux 6
  • Red Hat Red Hat Enterprise Linux 7
  • Red Hat Red Hat Enterprise Linux 8
  • Red Hat Red Hat Enterprise Linux 9
  • Red Hat Red Hat OpenShift Container Platform 4

Classification

Weakness

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.