CVE-2023-5215

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    CVE-2023-5215

    Published: 28 Sept 2023Last Modified: 12 Aug 2026

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

    Details: 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.

    References: https://access.redhat.com/downloads/content/package-browser/, https://listman.redhat.com/archives/libguestfs/2023-September/032635.html, https://access.redhat.com/errata/RHSA-2024:2204, https://access.redhat.com/security/cve/CVE-2023-5215, https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/5xxx/CVE-2023-5215.json, https://nvd.nist.gov/vuln/detail/CVE-2023-5215, https://bugzilla.redhat.com/show_bug.cgi?id=2241041

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- 0
    Fixed -3bb188603138aea8f1ecd237a422d4c7baa2377a

    Affected versions

    v1.17.5
    v1.17.4
    v1.17.3
    v1.17.2
    v1.17.1

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    CVE-2023-5215 | CVE-DB