Description
The internal DNS server in Samba 4.x before 4.1.23, 4.2.x before 4.2.9, 4.3.x before 4.3.6, and 4.4.x before 4.4.0rc4, when an AD DC is configured, allows remote authenticated users to cause a denial of service (out-of-bounds read) or possibly obtain sensitive information from process memory by uploading a crafted DNS TXT record.
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 | 2:4.3.6+dfsg-1 | — |
| Debian 13 | samba | 2:4.3.6+dfsg-1 | — |
| Debian 12 | samba | 2:4.3.6+dfsg-1 | — |
| Debian 8 | samba | 2:4.1.17+dfsg-2+deb8u2 | DSA-3514-1 |
| Debian 7 | samba | 2:3.6.6-6+deb7u7 | DSA-3514-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | samba | 2:4.3.6+dfsg-1ubuntu1 | — |
| Ubuntu 14.04 LTS | samba | 2:4.1.6+dfsg-1ubuntu2.14.04.13 | USN-2922-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | samba | 4.5.0-1.1 | openSUSE-SU-2024:10069-1 |
Advisories 3
- USN-2922-1 samba vulnerabilities Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-3514-1 samba - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2024:10069-1 ctdb-4.5.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- openSUSE-SU-2016:0813 vendor-advisory
- https://www.samba.org/samba/security/CVE-2016-0771.html
- https://bugzilla.samba.org/show_bug.cgi?id=11128
- https://bugzilla.samba.org/show_bug.cgi?id=11686
- 84273 vdb-entry
- USN-2922-1 vendor-advisory
- DSA-3514 vendor-advisory
- 1035219 vdb-entry