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Vulnerability · Published Jun 9, 2025 · Assigned by redhat

CVE-2025-47712Nbd: nbdkit: integer overflow triggers an assertion resulting in denial of service

Medium 6.5

In plain English

A medium-severity integer overflow in nbdkit. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.5%top 55.2% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A flaw exists in the nbdkit "blocksize" filter that can be triggered by a specific type of client request. When a client requests block status information for a very large data range, exceeding a certain limit, it causes an internal error in the nbdkit, leading to a denial of service.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12nbdkitno fix listedDEBIAN-CVE-2025-47712
Debian:13nbdkit1.42.3-1DEBIAN-CVE-2025-47712
Debian:14nbdkit1.42.3-1DEBIAN-CVE-2025-47712
Ubuntu:22.04:LTSnbdkitno fix listedUBUNTU-CVE-2025-47712
Ubuntu:24.04:LTSnbdkitno fix listedUBUNTU-CVE-2025-47712
Ubuntu:25.10nbdkitno fix listedUBUNTU-CVE-2025-47712
Ubuntu:26.04:LTSnbdkitno fix listedUBUNTU-CVE-2025-47712
Ubuntu:26.10nbdkitno fix listedUBUNTU-CVE-2025-47712

Affected products (as reported)

VendorProductVersions
nbdkit 1.21.16 – before 1.38.61.40.0 – before 1.40.61.42.0 – before 1.42.3
Red Hat Red Hat Enterprise Linux 10 see references
Red Hat Red Hat Enterprise Linux 7 see references
Red Hat Red Hat Enterprise Linux 8 see references
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization see references
Red Hat Red Hat Enterprise Linux 8 Advanced Virtualization see references
Red Hat Red Hat Enterprise Linux 9 see references

Weakness: CWE-190 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References