Riskcovery

CVE-2026-74573

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

State
Published
Severity
9.3 Critical
Published
Aug 15, 2026
Updated
Oct 16, 2026
Reserved
Aug 15, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.19.3 CriticalCVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • d68beb276ba26cec47350a6d468e967673ee0c56 to before 3808bab5d95ae79e333e11f6a73d178e084c645dAffected
  • d68beb276ba26cec47350a6d468e967673ee0c56 to before 0acbc621341aca4eb94d9c2f43e1ab273ff088f0Affected
  • d68beb276ba26cec47350a6d468e967673ee0c56 to before c3b8ee84a965058b41275069d4696f37a8b14bf6Affected
LinuxLinux
  • 6.13Affected
  • before 6.13Not affected
  • 6.18.44 through 6.18.*Not affected
  • 7.1.8 through 7.1.*Not affected
  • 7.2 and laterNot affected

References

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.