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CVE-2026-3238· NVD / CVE Program· CNA redhat

Samba: denial of service against ad dc wins server

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.

HighCVSS 7.5 · v3.1—No exploit Fix available

Noroxi analysis

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Published
Jun 8, 2026
Updated
Sep 1, 2026
EPSS
2.0% · 80th percentile
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Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.0%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · redhat
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Affected systems

VendorProduct
enterprise linux10
enterprise linux6
enterprise linux7
enterprise linux8
enterprise linux9
openshift4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Red Hat Red Hat Enterprise Linux 10

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 6

    • all versionsunknown
    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 8

    • all versionsunknown

  • Red Hat Red Hat Enterprise Linux 9

    • all versionsunknown

  • Red Hat Red Hat OpenShift Container Platform 4

    • all versionsaffected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.23sambabefore 4.22.10-r04.22.10-r0
Alpine:v3.24sambabefore 4.23.8-r04.23.8-r0
Debian:12sambabefore 2:4.17.12+dfsg-0+deb12u42:4.17.12+dfsg-0+deb12u4
Debian:13sambabefore 2:4.22.8+dfsg-0+deb13u22:4.22.8+dfsg-0+deb13u2
Debian:14sambabefore 2:4.24.3+dfsg-12:4.24.3+dfsg-1
openSUSE:Leap 16.0sambabefore 4.22.11+git.552.66cfeb7de0a-160000.1.14.22.11+git.552.66cfeb7de0a-160000.1.1
openSUSE:Leap 16.0sambabefore 4.22.9+git.506.22c03ce0781-160000.1.14.22.9+git.506.22c03ce0781-160000.1.1
openSUSE:Tumbleweedsambabefore 4.23.8+git.477.f78166bceed-1.14.23.8+git.477.f78166bceed-1.1
SUSE:Linux Micro 6.2sambabefore 4.22.9+git.506.22c03ce0781-160000.1.14.22.9+git.506.22c03ce0781-160000.1.1
SUSE:Linux Micro 6.2sambabefore 4.22.11+git.552.66cfeb7de0a-160000.1.14.22.11+git.552.66cfeb7de0a-160000.1.1

Same product

red hat: all records

Other highest-scoring records for the same primary product.

  • CVE-2025-10230Samba: command injection in wins server hook script
    52Plan
  • CVE-2026-4631Cockpit: cockpit: unauthenticated remote code execution due to ssh command-line argument injection
    42Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor
  • CVE-2025-4404Freeipa: idm: privilege escalation from host to domain admin in freeipa
    37Monitor
  • CVE-2025-7493Freeipa: idm: privilege escalation from host to domain admin in freeipa
    36Monitor
  • CVE-2025-49796Libxml: type confusion leads to denial of service (dos)
    36Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:samba4.22.10-r0 · Alpine:v3.23Package registry (OSV)
debian:samba2:4.17.12+dfsg-0+deb12u4 · Debian:12Package registry (OSV)
opensuse:samba4.23.8+git.477.f78166bceed-1.1 · openSUSE:TumbleweedPackage registry (OSV)
suse:samba4.22.9+git.506.22c03ce0781-160000.1.1 · SUSE:Linux Micro 6.2Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days-1% in 7 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-8515087 days apartGstreamer1-plugins-base: gstreamer: null/invalid-pointer dereference in gst_rtsp_message_parse_auth_credentials() when parsing a crafted digest authorization/ww
    30Monitor
  • CVE-2026-1432423 days apartPipewire: raop rtsp null deref
    26Monitor
  • CVE-2026-7319973 days apartIpa: freeipa: null pointer dereference in `ipa-enrollment` extended operation (`join_oid`) via missing request value
    26Monitor
  • CVE-2025-6395333 days apartGnutls: null pointer dereference in _gnutls_figure_common_ciphersuite()
    26Monitor
  • CVE-2025-32912420 days apartLibsoup: null pointer dereference in client when server omits the "nonce" parameter in an unauthorized response with digest authentication
    26Monitor
  • CVE-2026-9099598 days apartSssd: sssd: local denial of service due to null pointer dereference in pam responder
    22Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records