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    CVE-2023-5215

    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.

    Published:Sep 21, 2023
    Last Modified:Nov 8, 2025
    EPS:Sep 28, 2023
    EPSS Score:0.00065
    CVSS Score:5.3

    Affected Products

    Vendor
    Redhat
    Product
    Advanced Virtualization
    Vendor
    Redhat
    Product
    Enterprise Linux
    Vendor
    Redhat
    Product
    Libnbd

    Exploits

    https://listman.redhat.com/archives/libguestfs/2023-September/032635.htmlhttps://listman.redhat.com/archives/libguestfs/2023-September/032635.html

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-48 Passing Local Filenames to Functions That Expect a URL

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    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