iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field

{
  "id": "40d19c53a350838d851bc110ee1f80294d71186ed7958abf61c0d48eed159d78",
  "url": "https://osv.dev/vulnerability/CVE-2026-89450",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Reject a vSID wider than the SID_MATCH field tegra241_vintf_init_vsid() programs the guest-provided vSID into SID_MATCH, whose VIRT_SID field spans bits [20:1] with bit 0 as the match-enable flag. The HW therefore matches only a 20-bit Stream ID. The bound check rejects only virt_sid > UINT_MAX, which admits a value far wider than the field. The write \"virt_sid << 1 | 0x1\" then drops every bit above 20: a virt_sid of 0x80000000 lands as SID_MATCH = 0x1, a valid match on vSID 0, so the entry aliases the wrong Stream ID. Because vdev->virt_id is guest-controlled, a VMM can trigger it. Validate virt_sid against the field width with FIELD_MAX(), and program the register with FIELD_PREP() so the value and the field stay consistent.",
    "evidence": "osv:CVE-2026-89450",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.50",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-89450",
      "aliases": [
        "CVE-2026-89450"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "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"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
                },
                {
                  "fixed": "6.18.50"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89450.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:52.042880897Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4379610c79bd88ddbea10e7f6c21e16d4b338c6b",
        "https://git.kernel.org/stable/c/445204550f894ca325ac80a21e3df177ad073798",
        "https://git.kernel.org/stable/c/d903d99ffd22b0180bd745a43f221c21bcdd8d7c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89450.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-89450",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89450.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-89450",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 520927,
  "published_at": "2026-09-11T19:43:16.06+00:00"
}