Description
The modern style negotiation in Network Block Device (nbd-server) 2.9.22 through 3.3 allows remote attackers to cause a denial of service (root process termination) by (1) closing the connection during negotiation or (2) specifying a name for a non-existent export.
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 | 1:3.4-1 | — |
| Debian 13 | nbd | 1:3.4-1 | — |
| Debian 12 | nbd | 1:3.4-1 | — |
| Debian 8 | nbd | 1:3.8-4+deb8u1 | DSA-3271-1 |
| Debian 7 | nbd | 1:3.2-4~deb7u5 | DSA-3271-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | nbd | 1:3.7-1ubuntu0.1 | USN-2676-1 |
Advisories 2
- DSA-3271-1 nbd - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2676-1 nbd vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
References
- 74808 vdb-entry
- DSA-3271 vendor-advisory
- [oss-security] 20150519 CVE Request: nbd denial of service mailing-list
- [oss-security] 20150521 Re: CVE Request: nbd denial of service mailing-list
- USN-2676-1 vendor-advisory
- [Nbd] 20130128 NBD server terminates on SIGPIPE during negotiation mailing-list
- openSUSE-SU-2015:0994 vendor-advisory
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=781547
- https://github.com/yoe/nbd/commit/741495cb08503fd32a9d22648e63b64390c601f4