CVE-2026-74573

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.

CVSS v3 9.3 CRITICAL

9.3^/10

CVSS v3 : CRITICAL

Vector :

Exploitability : 2.5 / Impact : 6.0

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope CHANGED

References

Link	Resource
https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0
https://git.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645d
https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 13:18

Updated : 2026-08-17 06:19

NVD link : CVE-2026-74573

Mitre link : CVE-2026-74573

CVE.ORG link : CVE-2026-74573

JSON object : View

Products Affected

No product.

CWE

No CWE.

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