Description
A flaw was found in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4 in the way it processed NetBios over TCP/IP. This flaw allows a remote attacker could to cause the Samba server to consume excessive CPU use, resulting in a denial of service. This highest threat from this vulnerability is to system availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| — | Samba | All Samba versions before 4.10.17, before 4.11.11 and before 4.12.4 | — |
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 | 2:4.12.5+dfsg-1 | — |
| Debian 13 | samba | 2:4.12.5+dfsg-1 | — |
| Debian 12 | samba | 2:4.12.5+dfsg-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-0ubuntu1.3 | USN-4409-1 |
| Ubuntu 18.04 LTS | samba | 2:4.7.6+dfsg~ubuntu-0ubuntu2.17 | USN-4409-1 |
| Ubuntu 16.04 LTS | samba | 2:4.3.11+dfsg-0ubuntu0.16.04.28 | USN-4409-1 |
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+esm7 | USN-4409-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP2 | ldb | 2.0.12-3.3.1 | SUSE-SU-2020:1948-1 |
| SLES 15 SP2 | samba | 4.11.11+git.180.2cf3b203f07-4.5.1 | SUSE-SU-2020:1948-1 |
| SLES 15 SP1 | samba | 4.9.5+git.343.4bc358522a9-3.38.1 | SUSE-SU-2020:1913-1 |
| SLES 15 | samba | 4.7.11+git.240.76c9942a99f-4.43.1 | SUSE-SU-2020:2065-1 |
| SLES 12 SP5 | ldb | 1.5.8-3.5.1 | SUSE-SU-2020:2673-1 |
| SLES 12 SP5 | samba | 4.10.5+git.192.26ffbcd7231-3.11.1 | SUSE-SU-2020:2673-1, SUSE-SU-2020:2036-1 |
| SLES 12 SP4 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
Show 19 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP3 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SLES 12 SP2 | samba | 4.4.2-38.33.1 | SUSE-SU-2020:2312-1 |
| SLES 11 SP4 | samba +1 | 3.6.3-94.26.1 | SUSE-SU-2020:14437-1 |
| SLES 2 | samba | 4.9.5+git.343.4bc358522a9-3.38.1 | SUSE-SU-2020:1948-1, SUSE-SU-2020:1913-1 |
| SLES for SAP 15 | samba | 4.7.11+git.240.76c9942a99f-4.43.1 | SUSE-SU-2020:2065-1 |
| SLES for SAP 12 SP5 | ldb | 1.5.8-3.5.1 | SUSE-SU-2020:2673-1 |
| SLES for SAP 12 SP5 | samba | 4.10.5+git.192.26ffbcd7231-3.11.1 | SUSE-SU-2020:2673-1, SUSE-SU-2020:2036-1 |
| SLES for SAP 12 SP4 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SLES for SAP 12 SP3 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SLES for SAP 12 SP2 | samba | 4.4.2-38.33.1 | SUSE-SU-2020:2312-1 |
| SLE HPC 15 | samba | 4.7.11+git.240.76c9942a99f-4.43.1 | SUSE-SU-2020:2065-1 |
| SUSE OpenStack Cloud Crowbar 9 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SUSE OpenStack Cloud Crowbar 8 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SUSE OpenStack Cloud 9 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SUSE OpenStack Cloud 8 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SUSE OpenStack Cloud 7 | samba | 4.4.2-38.33.1 | SUSE-SU-2020:2312-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | samba +1 | 3.6.3-94.26.1 | SUSE-SU-2020:14437-1 |
| SUSE HPE Helion OpenStack 8 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
| SUSE Enterprise Storage 6 | samba | 4.9.5+git.343.4bc358522a9-3.38.1 | SUSE-SU-2020:1913-1 |
| SUSE Enterprise Storage 5 | samba | 4.6.16+git.186.c6d77b0d5a6-3.52.1 | SUSE-SU-2020:2066-1 |
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 | ldb | 2.0.12-lp152.2.3.1 | openSUSE-SU-2020:1313-1, openSUSE-SU-2020:1023-1 |
| openSUSE Leap 15.2 | samba | 4.11.11+git.180.2cf3b203f07-lp152.3.3.1 | openSUSE-SU-2020:1313-1, openSUSE-SU-2020:1023-1 |
| openSUSE Leap 15.1 | samba | 4.9.5+git.343.4bc358522a9-lp151.2.27.1 | openSUSE-SU-2020:0984-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | samba | 4.12.5-r0 | — |
| Alpine v3.23 | samba | 4.12.5-r0 | — |
| Alpine v3.22 | samba | 4.12.5-r0 | — |
| Alpine v3.21 | samba | 4.12.5-r0 | — |
| Alpine v3.20 | samba | 4.12.5-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | samba | 4.12.5-r0 | — |
| Alpine v3.18 | samba | 4.12.5-r0 | — |
| Alpine v3.17 | samba | 4.12.5-r0 | — |
| Alpine v3.16 | samba | 4.12.5-r0 | — |
| Alpine v3.15 | samba | 4.12.5-r0 | — |
| Alpine v3.14 | samba | 4.12.5-r0 | — |
| Alpine v3.13 | samba | 4.12.5-r0 | — |
| Alpine v3.12 | samba | 4.12.5-r0 | — |
| Alpine v3.11 | samba | 4.11.14-r0 | — |
| Alpine v3.10 | samba | 4.10.17-r0 | — |
Advisories 15
- WID-SEC-2026-3125 Samba: Mehrere Schwachstellen BSI CERT-Bund (WID) · Aug 31, 2026
- USN-4409-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DLA-2463-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- SUSE-SU-2020:2065-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2673-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2066-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 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
- openSUSE-SU-2020:1023-1 Security update for ldb, samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2312-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:0984-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:1913-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:2036-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2020:14437-1 Security update for samba SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2020:1313-1 Security update for ldb, samba SUSE / openSUSE Security Updates · May 7, 2025
- SUSE-SU-2020:1948-1 Security update for ldb, samba SUSE / openSUSE Security Updates · May 2, 2025
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1849491%3B
- https://www.samba.org/samba/security/CVE-2020-10745.html
- FEDORA-2020-5131d30947 vendor-advisory
- openSUSE-SU-2020:0984 vendor-advisory
- openSUSE-SU-2020:1023 vendor-advisory
- GLSA-202007-15 vendor-advisory
- openSUSE-SU-2020:1313 vendor-advisory
- [debian-lts-announce] 20201123 [SECURITY] [DLA 2463-1] samba security update mailing-list