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CVE-2026-74573

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

Published: Aug 15, 2026Updated: Aug 17, 2026 Sources: CVE List NVD
9.3CRITICAL
NVD MITRE
EPSS Score
0.1%
Top 96.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:LAC:LPR:NUI:NS:CC:HI:HA:H
Exploitability
AV:LAttack Vector
Local
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Affected Products

Linux
oss-projectaka the linux kernel
LinuxOn-premOS
Operating Systems / linux-distro

Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.
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References

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

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