Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| 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 | — | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | samba | 2:4.24.3+dfsg-1 | — |
| Debian 13 | samba | 2:4.22.8+dfsg-0+deb13u2 | — |
| Debian 12 | samba | 2:4.17.12+dfsg-0+deb12u4 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.04 LTS | samba | 2:4.23.6+dfsg-1ubuntu2.1 | — |
| Ubuntu 25.10 | samba | 2:4.22.3+dfsg-4ubuntu2.4 | — |
| Ubuntu 24.04 LTS | samba | 2:4.19.5+dfsg-4ubuntu9.6 | — |
| Ubuntu 22.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu1.12 | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | samba | 2:4.15.13+dfsg-0ubuntu0.20.04.8+esm2 | USN-8306-2 |
| Ubuntu Pro 18.04 LTS | samba | No fix yet | — |
| Ubuntu Pro 16.04 LTS | samba | No fix yet | — |
| Ubuntu Pro 14.04 LTS | samba | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1, SUSE-SU-2026:22080-1 |
| SLES 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23152-1, SUSE-SU-2026:23129-1, SUSE-SU-2026:22080-1 |
| SLE Micro 6.2 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | SUSE-SU-2026:23003-1, SUSE-SU-2026:22045-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.23.8+git.477.f78166bceed-1.1 | openSUSE-SU-2026:10884-1 |
| openSUSE Leap 16.0 | samba | 4.22.9+git.506.22c03ce0781-160000.1.1 | openSUSE-SU-2026:21540-1, openSUSE-SU-2026:20905-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.23.8-r0 | — |
| Alpine v3.23 | samba | 4.22.10-r0 | — |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2023 | samba +31 | 2:4.17.12-1.amzn2023.0.4 | ALAS2023-2026-1895 |
| Amazon Linux 2 | ctdb +26 | 4.10.16-24.amzn2.0.7 | ALAS2-2026-3493 |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | No fix yet | — |
Advisories 12
- WID-SEC-2026-1686 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Oct 15, 2026
- SUSE-SU-2026:23152-1 Security update for samba SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23129-1 Security update for samba SUSE / openSUSE Security Updates · Aug 14, 2026
- SUSE-SU-2026:23003-1 Security update for samba SUSE / openSUSE Security Updates · Aug 12, 2026
- openSUSE-SU-2026:21540-1 Security update for samba SUSE / openSUSE Security Updates · Aug 8, 2026
- ALAS2-2026-3493 Important: samba security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · Jul 7, 2026
- ALAS2023-2026-1895 Important: samba security update (Amazon Linux 2023) Amazon Linux Security Center (ALAS) · Jun 22, 2026
- SUSE-SU-2026:22080-1 Security update for samba SUSE / openSUSE Security Updates · Jun 16, 2026
- USN-8306-2 samba vulnerabilities Ubuntu Security Notices (USN) · Jun 10, 2026
- SUSE-SU-2026:22045-1 Security update for samba SUSE / openSUSE Security Updates · Jun 10, 2026
- openSUSE-SU-2026:20905-1 Security update for samba SUSE / openSUSE Security Updates · Jun 9, 2026
- openSUSE-SU-2026:10884-1 ctdb-4.23.8+git.477.f78166bceed-1.1 on GA media SUSE / openSUSE Security Updates · May 29, 2026