iommu/vt-d: Fix RB-tree corruption in probe error path

{
  "id": "de0475a86cfe3c7fb10da93dcd3d82a86b7f40c6185bff5fd241cc077aed2fa8",
  "url": "https://osv.dev/vulnerability/CVE-2026-74355",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu/vt-d: Fix RB-tree corruption in probe error path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix RB-tree corruption in probe error path The info->node RB-tree member is zero-initialized via kzalloc. If a device does not support ATS, the device_rbtree_insert() call is skipped. If a subsequent probe step fails, the error path jumps to device_rbtree_remove(), which misinterprets the zeroed node as a tree root and corrupts the device RB-tree. Fix this by explicitly initializing the RB-node as empty using RB_CLEAR_NODE() during initialization and guarding the removal with RB_EMPTY_NODE().",
    "evidence": "osv:CVE-2026-74355",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.40",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.5",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-74355",
      "aliases": [
        "CVE-2026-74355"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:H/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": "4f1492efb495bcef34c9ee8a94af81e6cea5abf4"
                },
                {
                  "fixed": "f5102e0fc3c6dc8685549891a96e4589fdb3e211"
                },
                {
                  "fixed": "d16923a45d4d08367650fdc3451c89299ab6ac5a"
                },
                {
                  "fixed": "43bd9e6d5513cb1edbafdeef146a1edc3aaced56"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74355.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.15.0"
                },
                {
                  "fixed": "6.18.40"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.5"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74355.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.883548383Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/43bd9e6d5513cb1edbafdeef146a1edc3aaced56",
        "https://git.kernel.org/stable/c/d16923a45d4d08367650fdc3451c89299ab6ac5a",
        "https://git.kernel.org/stable/c/f5102e0fc3c6dc8685549891a96e4589fdb3e211",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74355.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-74355",
        "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/2026/74xxx/CVE-2026-74355.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-74355",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490583,
  "published_at": "2026-08-15T05:58:40.766+00:00"
}