iommu/vt-d: Fix WARN_ON in iommu probe path

{
  "id": "3739a9e5826426181d9293aeccae60c2ad853812af1549f48f47898d27a70f43",
  "url": "https://osv.dev/vulnerability/CVE-2024-35957",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu/vt-d: Fix WARN_ON in iommu probe path",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu/vt-d: Fix WARN_ON in iommu probe path Commit 1a75cc710b95 (\"iommu/vt-d: Use rbtree to track iommu probed devices\") adds all devices probed by the iommu driver in a rbtree indexed by the source ID of each device. It assumes that each device has a unique source ID. This assumption is incorrect and the VT-d spec doesn't state this requirement either. The reason for using a rbtree to track devices is to look up the device with PCI bus and devfunc in the paths of handling ATS invalidation time out error and the PRI I/O page faults. Both are PCI ATS feature related. Only track the devices that have PCI ATS capabilities in the rbtree to avoid unnecessary WARN_ON in the iommu probe path. Otherwise, on some platforms below kernel splat will be displayed and the iommu probe results in failure. WARNING: CPU: 3 PID: 166 at drivers/iommu/intel/iommu.c:158 intel_iommu_probe_device+0x319/0xd90 Call Trace: ? __warn+0x7e/0x180 ? intel_iommu_probe_device+0x319/0xd90 ? report_bug+0x1f8/0x200 ? handle_bug+0x3c/0x70 ? exc_invalid_op+0x18/0x70 ? asm_exc_invalid_op+0x1a/0x20 ? intel_iommu_probe_device+0x319/0xd90 ? debug_mutex_init+0x37/0x50 __iommu_probe_device+0xf2/0x4f0 iommu_probe_device+0x22/0x70 iommu_bus_notifier+0x1e/0x40 notifier_call_chain+0x46/0x150 blocking_notifier_call_chain+0x42/0x60 bus_notify+0x2f/0x50 device_add+0x5ed/0x7e0 platform_device_add+0xf5/0x240 mfd_add_devices+0x3f9/0x500 ? preempt_count_add+0x4c/0",
    "evidence": "osv:CVE-2024-35957",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.8.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "CVE-2024-35957",
      "aliases": [
        "CVE-2024-35957"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
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                },
                {
                  "fixed": "fba8ca3e6f608b92e54271fdbd3ce569361939fc"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1a75cc710b956010137b4fe1d1fa3282bfd8f86c"
                },
                {
                  "fixed": "89436f4f54125b1297aec1f466efd8acb4ec613d"
                }
              ]
            }
          ],
          "versions": [
            "v6.8.6",
            "v6.8.5",
            "v6.8.4",
            "v6.8.3",
            "v6.8.2"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35957.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.8.2"
                },
                {
                  "fixed": "6.8.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-35957.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:32.885146503Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/89436f4f54125b1297aec1f466efd8acb4ec613d",
        "https://git.kernel.org/stable/c/fba8ca3e6f608b92e54271fdbd3ce569361939fc",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/35xxx/CVE-2024-35957.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-35957",
        "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/2024/35xxx/CVE-2024-35957.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-35957",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 499820,
  "published_at": "2024-05-20T09:41:49.93+00:00"
}