iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset

{
  "id": "c8f7eef03f651f79955ac39eba44c8e189d113850b2dec26cbea5d6892907b53",
  "url": "https://osv.dev/vulnerability/CVE-2026-52952",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: iommu: Fix WARN_ON in __iommu_group_set_domain_nofail() due to reset In __iommu_group_set_domain_internal(), concurrent domain attachments are rejected when any device in the group is recovering. This is necessary to fence concurrent attachments to a multi-device group where devices might share the same RID due to PCI DMA alias quirks, but triggers the WARN_ON in __iommu_group_set_domain_nofail(). Other IOMMU_SET_DOMAIN_MUST_SUCCEED callers in detach/teardown paths, such as __iommu_group_set_core_domain and __iommu_release_dma_ownership, should not be rejected, as the domain would be freed anyway in these nofail paths while group->domain is still pointing to it. So pci_dev_reset_iommu_done() could trigger a UAF when re-attaching group->domain. Honor the IOMMU_SET_DOMAIN_MUST_SUCCEED flag, allowing the callers through the group->recovery_cnt fence, so as to update the group->domain pointer. Instead add a gdev->blocked check in the device iteration loop, to prevent any concurrent per-device detachment.",
    "evidence": "osv:CVE-2026-52952",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-52952",
      "aliases": [
        "CVE-2026-52952"
      ],
      "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": "c279e83953d937470f8a6e69b69f62608714f13f"
                },
                {
                  "fixed": "8fc289e809f3eb7e36cadc4684ab6fad747a5a93"
                },
                {
                  "fixed": "5474e6e17a262db45c60575c73f70210f5c7001f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52952.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "7.0.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52952.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:28.965174563Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5474e6e17a262db45c60575c73f70210f5c7001f",
        "https://git.kernel.org/stable/c/8fc289e809f3eb7e36cadc4684ab6fad747a5a93",
        "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-52952.json",
        "https://access.redhat.com/security/cve/CVE-2026-52952",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52952.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52952",
        "https://bugzilla.redhat.com/show_bug.cgi?id=2492422",
        "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/2026/52xxx/CVE-2026-52952.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52952",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 495521,
  "published_at": "2026-06-24T16:28:35.247+00:00"
}