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NVD / CVE Program· CNA redhat

CVE-2026-3238: Samba: denial of service against ad dc wins server

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 2.6% (FIRST EPSS); higher than 85.7% of all records.
  • 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.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: samba (Alpine:v3.23) 4.22.10-r0; samba (Alpine:v3.24) 4.23.8-r0; samba (Debian:12) 2:4.17.12+dfsg-0+deb12u4.

Low priority for now. Upgrade to samba (Alpine:v3.23) 4.22.10-r0; samba (Alpine:v3.24) 4.23.8-r0; samba (Debian:12) 2:4.17.12+dfsg-0+deb12u4 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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
Published
Jun 8, 2026
Updated
Sep 1, 2026
EPSS
2.6% · 85th percentile

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 · 2.6%

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.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-3238

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

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 4.22.11+git.552.66cfeb7de0a-160000.1.14.22.11+git.552.66cfeb7de0a-160000.1.1
SUSE:Linux Micro 6.2sambabefore 4.22.9+git.506.22c03ce0781-160000.1.14.22.9+git.506.22c03ce0781-160000.1.1

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
    44Plan
  • CVE-2026-76578Ipa: freeipa: freeipa: unauthenticated ldap client can obtain administrator credentials via the self-managed-token aci
    39Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2026-10118Jun 1, 2026 · Poppler: integer overflow in poppler splashoutputdev::tilingpatternfill leads to heap buffer overflow via unchecked dimension multiplication
    31Monitor
  • ← EarlierCVE-2026-5419Jun 1, 2026 · Gnutls: gnutls: information disclosure via timing side-channel in pkcs#7 padding removal
    14Monitor
  • Later →CVE-2026-11837Jun 10, 2026 · Ansible-collection-ansible-posix: ansible.posix authorized_key: local privilege escalation via symlink-following chown
    29Monitor

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.

No history yet (it accumulates with the daily EPSS job).

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-2026-104044120 days apartSssd: sssd: denial of service via crafted passkey kerberos authentication request
    24Monitor

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

Show all references (3 more)

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

All records