CVE-2026-90332
HighCVSS 8.2Exploitation Probability (EPSS)
Low risk15th percentile - higher than 15% of all known CVEs
Summary
In the Linux kernel's PCI dwc ep driver, a vulnerability exists where the MSI path lacks a flush equivalent to the MSI-X path before unmapping the iATU entry. This can cause posted MSI writes to be dropped or misrouted when the iATU entry is unmapped.
Risk Assessment
The risk includes loss of MSI interrupts, potentially leading to malfunction of PCIe devices and possible system crashes.
Recommendation
Apply the patch that adds a readback from the mapped MSI window before unmapping to drain posted writes, and update the kernel to a version with the fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: PCI: dwc: ep: Flush cached MSI write before unmapping the iATU The MSI-X path already flushes any posted MSI-X write before tearing down its iATU mapping. That was added by commit c22533c66cca ("PCI: dwc: ep: Flush MSI-X write before unmapping its ATU entry") to make sure the write reaches the Root Complex before the outbound window that translates it disappears. The MSI path has the same problem but no equivalent flush. When the Endpoint driver caches an MSI target address and later observes that the Root Complex has changed it, dw_pcie_ep_raise_msi_irq() unmaps the existing iATU entry and reprograms it for the new address. Between the last MSI writel() and the unmap there may still be a posted write sitting in the fabric, and unmapping the iATU entry can drop or misroute that write. Fix this by reading back from the mapped MSI window before the unmap. The readback drains any posted MSI writes through the same iATU entry that mapped them, which is the same logic the MSI-X path uses. [mani: commit log]
Vulnerability data from NVD (NIST) · CISA KEV · EPSS