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    CVE-2026-101309

    The xHCI (USB 3) device model did not validate or save the event ring size provided by the guest. The size was re-read from guest memory on each use, and Transfer Request Block (TRB) fields were loaded without protection against concurrent modification by the guest. This race condition could be triggered by a guest running malicious, privileged code. A malicious guest can crash the bhyve process or potentially execute arbitrary code in the host userspace context running the virtual machine, subject to bhyve's Capsicum sandbox.

    Published:Oct 15, 2026
    Last Modified:Oct 16, 2026
    EPS:Oct 15, 2026
    EPSS Score:0.00117
    CVSS Score:7

    Affected Products

    Vendor
    Freebsd
    Product
    Freebsd

    Exploits

    No exploit reference

    Related CVEs

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    CVE-2026-101302 (CVSS 6.5) — TLS 1.3 embeds the actual record type as the last non-zero byte of the decrypted payload, optionally followed …
    CVE-2026-101306 (CVSS 9.8) — SCM_RIGHTS file descriptor passing did not preserve FD_RESOLVE_BENEATH when a descriptor was transferred. A p…
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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