CVE-2023-5215 - CVE House

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Status published Medium CVE-2023-5215

Libnbd: crash or misbehaviour when nbd server returns an unexpected block size

5.3 CVSS

Vulnerability Description

A flaw was found in libnbd. A server can reply with a block size larger than 2^63 (the NBD spec states the size is a 64-bit unsigned value). This issue could lead to an application crash or other unintended behavior for NBD clients that doesn't treat the return value of the nbd_get_size() function correctly.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

No credits recorded in the NVD database.

References

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Affected Vendor

Red Hat

View all reports →

Affected Software

Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 8 Advanced Virtualization

Vulnerable Versions:

0:1.18.1-3.el9

Timeline

Official Publish: September 28th, 2023

Last Modified: November 8th, 2025

Added to House: July 22nd, 2026

CVSS Vectors

V3: CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Weaknesses (CWE)

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.