{"id":"CVE-2026-89450","summary":"iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field\n\ntegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH,\nwhose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag.\nThe HW therefore matches only a 20-bit Stream ID.\n\nThe bound check rejects only virt_sid \u003e UINT_MAX, which admits a value far\nwider than the field. The write \"virt_sid \u003c\u003c 1 | 0x1\" then drops every bit\nabove 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match\non vSID 0, so the entry aliases the wrong Stream ID. Because vdev-\u003evirt_id\nis guest-controlled, a VMM can trigger it.\n\nValidate virt_sid against the field width with FIELD_MAX(), and program the\nregister with FIELD_PREP() so the value and the field stay consistent.","modified":"2026-09-13T03:47:18.060914986Z","published":"2026-09-11T19:43:16.060Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89450.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89450.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89450"},{"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":"4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7"},{"fixed":"d903d99ffd22b0180bd745a43f221c21bcdd8d7c"},{"fixed":"445204550f894ca325ac80a21e3df177ad073798"},{"fixed":"4379610c79bd88ddbea10e7f6c21e16d4b338c6b"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89450.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89450.json"}}],"schema_version":"1.9.0"}