iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE
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.
CVE-2026-74573
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-74573
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "d68beb276ba26cec47350a6d468e967673ee0c56",
"lessThan": "3808bab5d95ae79e333e11f6a73d178e084c645d",
"versionType": "git"
},
{
"status": "affected",
"version": "d68beb276ba26cec47350a6d468e967673ee0c56",
"lessThan": "0acbc621341aca4eb94d9c2f43e1ab273ff088f0",
"versionType": "git"
},
{
"status": "affected",
"version": "d68beb276ba26cec47350a6d468e967673ee0c56",
"lessThan": "c3b8ee84a965058b41275069d4696f37a8b14bf6",
"versionType": "git"
}
],
"programFiles": [
"drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.18.44",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.1.8",
"versionType": "semver",
"lessThanOrEqual": "7.1.*"
},
{
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-74573
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #33212 · Revision 1
- Added to Heist Feed
- Publisher date