iommu: Handle unmap error when iommu_debug is enabled

{
  "id": "4f62e5246fd7f957b8c0a5615c202b7fd4d328f5b01ab70746da433b438dffdd",
  "url": "https://osv.dev/vulnerability/CVE-2026-64152",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu: Handle unmap error when iommu_debug is enabled",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu: Handle unmap error when iommu_debug is enabled Sashiko noticed a latent bug where the map error flow called iommu_unmap() which calls iommu_debug_unmap_begin()/iommu_debug_unmap_end() however since this is an error path the map flow never actually established the original iommu_debug_map() it will malfunction. Lift the unmap error handling into iommu_map_nosync() and reorder it so the trace_map()/iommu_debug_map() records the partial mapping and then immediately unmaps it. This avoid creating the unbalanced tracking and provides saner tracing instead of a unmap unmatched to any map.",
    "evidence": "osv:CVE-2026-64152",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.0.11",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-64152",
      "aliases": [
        "CVE-2026-64152"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:H/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": "ccc21213f013834b484cdcc738e282f963fcfc97"
                },
                {
                  "fixed": "0cd028806efc148a75d4acf711d21db335a89661"
                },
                {
                  "fixed": "0735c54804c709d1b292f3b6947cfb560b2ce552"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64152.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.0.11"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-64152.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:22.238280726Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0735c54804c709d1b292f3b6947cfb560b2ce552",
        "https://git.kernel.org/stable/c/0cd028806efc148a75d4acf711d21db335a89661",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64152.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-64152",
        "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/2026/64xxx/CVE-2026-64152.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-64152",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 488420,
  "published_at": "2026-07-19T15:40:41.354+00:00"
}