Answer in brief
CVE-2026-74573 records a Unknown severity vulnerability in iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d68beb276ba26cec47350a6d468e967673ee0c56 <3808bab5d95ae79e333e11f6a73d178e084c645d || >=d68beb276ba26cec47350a6d468e967673ee0c56 <0acbc621341aca4eb94d9c2f43e1ab273ff088f0 || >=d68beb276ba26cec47350a6d468e967673ee0c56 <c3b8ee84a965058b41275069d4696f37a8b14bf6 | 3808bab5d95ae79e333e11f6a73d178e084c645d, 0acbc621341aca4eb94d9c2f43e1ab273ff088f0, c3b8ee84a965058b41275069d4696f37a8b14bf6 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.
Answer in brief
CVE-2026-74573 records a Unknown severity vulnerability in iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=d68beb276ba26cec47350a6d468e967673ee0c56 <3808bab5d95ae79e333e11f6a73d178e084c645d || >=d68beb276ba26cec47350a6d468e967673ee0c56 <0acbc621341aca4eb94d9c2f43e1ab273ff088f0 || >=d68beb276ba26cec47350a6d468e967673ee0c56 <c3b8ee84a965058b41275069d4696f37a8b14bf6 | 3808bab5d95ae79e333e11f6a73d178e084c645d, 0acbc621341aca4eb94d9c2f43e1ab273ff088f0, c3b8ee84a965058b41275069d4696f37a8b14bf6 |
| Linux/Linuxgeneric | 6.13 | Not reported |
Published upstream
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.