{"id":"CVE-2026-74573","revision":"c091c276af5643e7afaee41cde63e054","records":[{"revision":"c091c276af5643e7afaee41cde63e054","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-74573","aliases":[],"title":"iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE","description":"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's vSID to a single physical Stream ID\ntaken from master->streams[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' ATC and IOTLB entries; a device with\nnone makes master->streams a ZERO_SIZE_PTR, read out of bounds.\n\nAdd an arm_vsmmu_vdevice_init() op to reject the vDEVICE with -EOPNOTSUPP\nwhen master->num_streams is not one, rather than mapping it silently.","state":0,"publishedAt":"2026-08-15T12:28:11.935+00:00","modifiedAt":"2026-10-16T19:05:56.969+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"d68beb276ba26cec47350a6d468e967673ee0c56\",\n                            \"lessThan\": \"3808bab5d95ae79e333e11f6a73d178e084c645d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d68beb276ba26cec47350a6d468e967673ee0c56\",\n                            \"lessThan\": \"0acbc621341aca4eb94d9c2f43e1ab273ff088f0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"d68beb276ba26cec47350a6d468e967673ee0c56\",\n                            \"lessThan\": \"c3b8ee84a965058b41275069d4696f37a8b14bf6\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.13\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.13\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.44\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.8\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H","score":9.3,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/3808bab5d95ae79e333e11f6a73d178e084c645d","https://git.kernel.org/stable/c/0acbc621341aca4eb94d9c2f43e1ab273ff088f0","https://git.kernel.org/stable/c/c3b8ee84a965058b41275069d4696f37a8b14bf6"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74573","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-74573","identifiers":["CVE-2026-74573"]},"retained":false,"historicalAffected":[]}],"coverage":[]}