GHSA-P5WJ-HQVH-C7X4
Vulnerability from github – Published: 2026-08-15 15:30 – Updated: 2026-08-17 06:33In 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.
{
"affected": [],
"aliases": [
"CVE-2026-74573"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-08-15T13:18:02Z",
"severity": "CRITICAL"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE\n\narm_vsmmu_vsid_to_sid() maps a guest\u0027s vSID to a single physical Stream ID\ntaken from master-\u003estreams[0], assuming a device has exactly one stream. A\ndevice with several streams gets only its first one mapped, so a guest vSID\ninvalidation cannot reach the others\u0027 ATC and IOTLB entries; a device with\nnone makes master-\u003estreams a ZERO_SIZE_PTR, read out of bounds.\n\nAdd an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP\nwhen master-\u003enum_streams is not one, rather than mapping it silently.",
"id": "GHSA-p5wj-hqvh-c7x4",
"modified": "2026-08-17T06:33:54Z",
"published": "2026-08-15T15:30:36Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74573"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645d"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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