Description
A flaw was found in samba's DNS server. An authenticated user could use this flaw to the RPC server to crash. This RPC server, which also serves protocols other than dnsserver, will be restarted after a short delay, but it is easy for an authenticated non administrative attacker to crash it again as soon as it returns. The Samba DNS server itself will continue to operate, but many RPC services will not.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | samba | samba 4.11.15, samba 4.12.9, samba 4.13.1 | — |
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 | 2:4.13.2+dfsg-2 | — |
| Debian 13 | samba | 2:4.13.2+dfsg-2 | — |
| Debian 12 | samba | 2:4.13.2+dfsg-2 | — |
| Debian 10 | samba | 2:4.9.5+dfsg-5+deb10u5 | DLA-3792-1 |
| Debian 9 | samba | 2:4.5.16+dfsg-1+deb9u3 | DLA-2463-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | samba | 2:4.11.6+dfsg-0ubuntu1.6 | USN-4611-1 |
| Ubuntu 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.21 | USN-4611-1 |
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.32 | USN-4611-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 14.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm11 | USN-4931-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | samba | 4.11.14+git.202.344b137b75d-4.14.1 | SUSE-SU-2020:3081-1 |
| SLES 15 SP1 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1 |
| SLES 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SLES 12 SP5 | samba | 4.10.18+git.219.1d732314d96-3.20.1 | SUSE-SU-2020:3082-1 |
| SLES 12 SP4 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
Show 15 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLES 2 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1, SUSE-SU-2020:3081-1 |
| SLES for SAP 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SLES for SAP 12 SP5 | samba | 4.10.18+git.219.1d732314d96-3.20.1 | SUSE-SU-2020:3082-1 |
| SLES for SAP 12 SP4 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLES for SAP 12 SP3 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SLE HPC 15 | samba | 4.7.11+git.280.25dfd9a947d-4.51.1 | SUSE-SU-2020:3087-1 |
| SUSE OpenStack Cloud Crowbar 9 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud Crowbar 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud 9 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE OpenStack Cloud 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE HPE Helion OpenStack 8 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
| SUSE Enterprise Storage 7 | samba | 4.13.3+git.181.fc4672a5b81-3.3.1 | SUSE-SU-2021:0185-1 |
| SUSE Enterprise Storage 6 | samba | 4.9.5+git.383.7b7f8f14df8-3.47.1 | SUSE-SU-2020:3092-1 |
| SUSE Enterprise Storage 5 | samba | 4.6.16+git.248.c833312e640-3.58.1 | SUSE-SU-2020:3093-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.14.6+git.182.2205d5224e3-1.1 | openSUSE-SU-2024:11365-1 |
| openSUSE Leap 15.2 | samba | 4.11.14+git.202.344b137b75d-lp152.3.16.1 | openSUSE-SU-2020:1819-1 |
| openSUSE Leap 15.1 | samba | 4.9.5+git.383.7b7f8f14df8-lp151.2.36.1 | openSUSE-SU-2020:1811-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.12.9-r0 | — |
| Alpine v3.23 | samba | 4.12.9-r0 | — |
| Alpine v3.22 | samba | 4.12.9-r0 | — |
| Alpine v3.21 | samba | 4.12.9-r0 | — |
| Alpine v3.20 | samba | 4.12.9-r0 | — |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.12.9-r0 | — |
| Alpine v3.18 | samba | 4.12.9-r0 | — |
| Alpine v3.17 | samba | 4.12.9-r0 | — |
| Alpine v3.16 | samba | 4.12.9-r0 | — |
| Alpine v3.15 | samba | 4.12.9-r0 | — |
| Alpine v3.14 | samba | 4.12.9-r0 | — |
| Alpine v3.13 | samba | 4.12.9-r0 | — |
| Alpine v3.12 | samba | 4.12.9-r0 | — |
| Alpine v3.11 | samba | 4.11.16-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | samba | 4.18.3-1 | — |
| Azure Linux 2 (CBL-Mariner) | samba | No fix yet | — |
Advisories 14
- USN-4931-1 samba vulnerabilities Ubuntu Security Notices (USN) · Jun 29, 2026
- USN-4611-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-3792-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-2463-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:11365-1 ctdb-4.14.6+git.182.2205d5224e3-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3092-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3087-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1819-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3093-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1811-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2021:0185-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3082-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:3081-1 Security update for samba SUSE / openSUSE Security Updates · May 2, 2025
- WID-SEC-2023-0174 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Apr 22, 2024