CVE-2026-90242
UnknownSummary
In the Linux kernel's iommu/vt-d subsystem, there is an iopf_refcount leak when replacing a domain at the RID level. The functions identity_domain_attach_dev() and blocking_domain_attach_dev() do not disable IOPF for the old domain, leading to a reference leak. As a result, the count never drops to zero, triggering a WARN_ON when the device is released.
Risk Assessment
The reference leak can cause incorrect IOPF behavior and kernel warnings during PCI device detachment. This may destabilize the system in environments with active I/O virtualization.
Recommendation
Apply the Linux kernel patch that uses the iopf_for_domain_replace() helper in the RID paths to maintain the correct enable-before-disable ordering of IOPF.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix iopf_refcount leak on RID domain replacement intel_iommu_attach_device() enables IOPF for the new domain but never disables it for the old one. device_block_translation(), called at the start of the function, tears down translation but does not touch any IOPF state; blocking_domain_attach_dev() has to call iopf_for_domain_remove() explicitly before invoking it for exactly this reason. identity_domain_attach_dev() has the same problem. Its comment claims that no PRI handling is needed because the device has been put in the blocking state, but the blocking state and the IOPF reference count are independent of each other. As a result, replacing a domain that has an iopf_handler with another domain at RID level leaks a reference in info->iopf_refcount. The count never drops back to zero, so iopf_queue_remove_device() is never called and iommu_disable_pci_pri() triggers its WARN_ON(info->iopf_refcount) when the device is released. The PASID paths already handle this correctly by way of iopf_for_domain_replace(); convert the two RID paths to do the same. Using the replace helper rather than a bare remove keeps the enable before the disable, so the reference count does not transiently reach zero and evict the device from the IOPF queue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS