CVE-2026-90240

/// Technical description

In the Linux kernel, the following vulnerability has been resolved:

iommu/vt-d: Flush context cache with correct SID when tearing down aliases

domain_context_clear_one() and device_pasid_table_teardown() are both

invoked once per DMA alias of a device. Each function locates the context

entry using the bus/devfn pair provided by the pci_for_each_dma_alias()

callback, then calls intel_context_flush_no_pasid(), which constructs a

device-selective context-cache invalidation from info->bus and

info->devfn (that is, always the requester ID of the device itself).

As a result, for every alias other than the device’s own RID, the context

entry that was just cleared in memory is never invalidated in the context

cache. Hardware may continue using that stale cached entry. In the

scalable-mode teardown path, intel_pasid_free_table() can then free the

PASID directory still referenced by that stale entry, allowing the IOMMU

to walk freed memory.

Fix this by passing the source ID of the entry bein

/// Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

/// References