Medium [CVE-2025-47711] Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
This medium-severity Red Hat Linux advisory covers CVE-2025-47711 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8 Advanced Virtualization.
Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.
VulniPulse record published
Summary
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.
This vulnerability was rated as a Moderate severity by the Red Hat Product Security team. Based on the fact that while this vulnerability can be exploited remotely (AV:N) with relative ease (AC:L), it does require the attacker to have valid credentials to the target (PR:L).
The primary impact is a temporary denial-of-service (A:L), meaning the server becomes unavailable, potentially disrupting dependent services. However, this exploitation does not lead to any compromise of data confidentiality (C:N) or integrity (I:N).
Weakness: CWE-193. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 8 Advanced Virtualization; Red Hat Enterprise Linux 9.
Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: nbdkit.
Is CVE-2025-47711 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2025-47711 is not in the CISA KEV catalog (checked ) and this advisory does not report exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2025-47711?
The advisory VulniPulse tracks names no fixed release. Follow Red Hat's guidance for workarounds and updates.
Confirm against the vendor advisory before you patch.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 5 days ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 5 days ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 5 days ago·verify at source
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