CVE-2026-74573 - iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE

CVE-2026-74573 - iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE

https://cvefeed.io/rssfeed/latest.atom / Sat, 08/15/2026 - 19:26
CVE ID :CVE-2026-74573
Published : Aug. 15, 2026, 1:18 p.m. | 2 hours, 11 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE arm_vsmmu_vsid_to_sid() maps a guest's vSID to a single physical Stream ID taken from master->streams[0], assuming a device has exactly one stream. A device with several streams gets only its first one mapped, so a guest vSID invalidation cannot reach the others' ATC and IOTLB entries; a device with none makes master->streams a ZERO_SIZE_PTR, read out of bounds. Add an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP when master->num_streams is not one, rather than mapping it silently.
Severity: 0.0 | NA
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