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CVE-2025-37889 – XEN PCI MSI NULL Pointer Dereference Vulnerability

The following table lists the changes that have been made to the
CVE-2025-37889 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution
of a vulnerability, and for identifying the most recent changes that may
impact the vulnerability’s severity, exploitability, or other characteristics.

  • New CVE Received
    by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    May. 09, 2025

    Action Type Old Value New Value
    Added Description In the Linux kernel, the following vulnerability has been resolved:

    PCI/MSI: Handle the NOMASK flag correctly for all PCI/MSI backends

    The conversion of the XEN specific global variable pci_msi_ignore_mask to a
    MSI domain flag, missed the facts that:

    1) Legacy architectures do not provide a interrupt domain
    2) Parent MSI domains do not necessarily have a domain info attached

    Both cases result in an unconditional NULL pointer dereference. This was
    unfortunatly missed in review and testing revealed it late.

    Cure this by using the existing pci_msi_domain_supports() helper, which
    handles all possible cases correctly.
    Added Reference https://git.kernel.org/stable/c/2e3ad60b8f72a95e3a32ddd9d70ea129aa3fcfb7
    Added Reference https://git.kernel.org/stable/c/3ece3e8e5976c49c3f887e5923f998eabd54ff40
    Added Reference https://git.kernel.org/stable/c/46d357520934eef99fa121889f8ebbf46a6eddb8
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