CVE-2025-47711
Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
nbdkit
https://nbdkit.org/ |
≥ 1.11.10; < 1.38.6 (affected, semver) ≥ 1.40.0; < 1.40.6 (affected, semver) ≥ 1.42.0; < 1.42.3 (affected, semver) Other versions: unaffected |
CNA: redhat |
| Red Hat Enterprise Linux 10 Red Hat nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
| Red Hat Enterprise Linux 7 Red Hat nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 8 Red Hat virt:rhel/nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 8 Advanced Virtualization Red Hat virt:8.2/nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 8 Advanced Virtualization Red Hat virt:av/nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: unknown |
CNA: redhat |
| Red Hat Enterprise Linux 9 Red Hat nbdkit
https://access.redhat.com/downloads/content/package-browser/ |
Range not reported
Other versions: affected |
CNA: redhat |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.5 medium |
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | CNA: redhat |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://access.redhat.com/security/cve/CVE-2025-47711CNA: redhat · vdb-entry, x_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2365687CNA: redhat · issue-tracking, x_refsource_REDHAT
- https://lists.libguestfs.org/archives/list/[email protected]/thread/67E7AASHHADIY7VAD3FFW2I67LTWVWYF/CNA: redhat
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