{"id":"CVE-2026-74573","summary":"iommu/arm-smmu-v3-iommufd: Require exactly one Stream ID for a vDEVICE","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's 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' 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.","modified":"2026-08-17T03:54:57.638541788Z","published":"2026-08-15T12:28:11.935Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74573.json","cna_assigner":"Linux"},"references":[{"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"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74573.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74573"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"d68beb276ba26cec47350a6d468e967673ee0c56"},{"fixed":"3808bab5d95ae79e333e11f6a73d178e084c645d"},{"fixed":"0acbc621341aca4eb94d9c2f43e1ab273ff088f0"},{"fixed":"c3b8ee84a965058b41275069d4696f37a8b14bf6"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74573.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74573.json"}}],"schema_version":"1.9.0"}