Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
CVE-2025-47711 is fixed in nbdkit on 1 platform, first by DEBIAN-CVE-2025-47711, released June 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.
There's a flaw in the nbdkit server when handling responses from its plugins regarding the status of data blocks. If a client makes a specific request for a very large data range, and a plugin responds with an even larger single block, the nbdkit server can encounter a critical internal error, leading to a denial-of-service.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| nbdkit · Debian 13.5 (trixie) | 1.42.3-1 | DEBIAN-CVE-2025-47711 | Jun 9, 2025 |
| nbdkit · Debian 14 | 1.42.3-1 | DEBIAN-CVE-2025-47711 | Jun 9, 2025 |
| nbdkit · opensuse-leap 15.6 | 1.36.5-150400.3.9.1 | SUSE-SU-2025:01889-1 | Jun 11, 2025 |
| nbdkit · sles 15.6 | 1.36.5-150400.3.9.1 | SUSE-SU-2025:01889-1 | Jun 11, 2025 |
| nbdkit · sles 15.7 | 1.40.6-150700.4.3.1 | SUSE-SU-2025:01888-1 | Jun 11, 2025 |
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