CVE-2023-5215
Libnbd: crash or misbehaviour when nbd server returns an unexpected block size
CVSS Score
5.3
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-241 |
| Vendor | red hat |
| Product | red hat enterprise linux 9 |
| Published | Sep 28, 2023 |
| Last Updated | Nov 8, 2025 |
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CVSS v3 Breakdown
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Adjacent
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
Red Hat / Red Hat Enterprise Linux 9
All versions affected Red Hat / Red Hat Enterprise Linux 8
All versions affected Red Hat / Red Hat Enterprise Linux 8 Advanced Virtualization
All versions affected Red Hat / Red Hat Enterprise Linux 8 Advanced Virtualization
All versions affected References
access.redhat.com: https://access.redhat.com/errata/RHSA-2024:2204 access.redhat.com: https://access.redhat.com/security/cve/CVE-2023-5215 bugzilla.redhat.com: https://bugzilla.redhat.com/show_bug.cgi?id=2241041 listman.redhat.com: https://listman.redhat.com/archives/libguestfs/2023-September/032635.html