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CVE-2025-47711: Nbdkit: nbdkit-server: off-by-one error when processing block status may lead to a denial of service
Description
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.
Classification
CVE ID: CVE-2025-47711
Problem Types
Off-by-one ErrorAffected Products
Vendor: Red Hat
Product: 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
Exploit Prediction Scoring System (EPSS)
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 10.85% (scored less or equal to compared to others)
EPSS Date: 2025-06-12 (when was this score calculated)
References
https://nvd.nist.gov/vuln/detail/CVE-2025-47711https://access.redhat.com/security/cve/CVE-2025-47711
https://bugzilla.redhat.com/show_bug.cgi?id=2365687