Description
nbd-server in Network Block Device (nbd) before 3.5 does not properly check IP addresses, which might allow remote attackers to bypass intended access restrictions via an IP address that has a partial match in the authfile configuration file.
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 | nbd | 1:3.5-1 | — |
| Debian 13 | nbd | 1:3.5-1 | — |
| Debian 12 | nbd | 1:3.5-1 | — |
| Debian 7 | nbd | 1:3.2-4~deb7u4 | DSA-2806-1 |
| Debian 6.0 | nbd | 1:2.9.16-8+squeeze1 | DSA-2806-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | nbd | 1:3.7-1ubuntu0.1 | USN-2676-1 |
Advisories 2
- DSA-2806-1 nbd - privilege escalation Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2676-1 nbd vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
References
- 64002 vdb-entry
- USN-2676-1 vendor-advisory
- [oss-security] 20131129 Re: CVE request: incorrect parsing of access control file in nbd-server mailing-list
- [nbd-general] 20131201 [Nbd] 3.5 released mailing-list
- DSA-2806 vendor-advisory