cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window

{
  "id": "e3f03d3db07fabaf82e1431375c9802c916049c490c312dcf00f129f84bc533b",
  "url": "https://osv.dev/vulnerability/CVE-2024-26761",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cxl/pci: Fix disabling memory if DVSEC CXL Range does not match a CFMWS window The Linux CXL subsystem is built on the assumption that HPA == SPA. That is, the host physical address (HPA) the HDM decoder registers are programmed with are system physical addresses (SPA). During HDM decoder setup, the DVSEC CXL range registers (cxl-3.1, 8.1.3.8) are checked if the memory is enabled and the CXL range is in a HPA window that is described in a CFMWS structure of the CXL host bridge (cxl-3.1, 9.18.1.3). Now, if the HPA is not an SPA, the CXL range does not match a CFMWS window and the CXL memory range will be disabled then. The HDM decoder stops working which causes system memory being disabled and further a system hang during HDM decoder initialization, typically when a CXL enabled kernel boots. Prevent a system hang and do not disable the HDM decoder if the decoder's CXL range is not found in a CFMWS window. Note the change only fixes a hardware hang, but does not implement HPA/SPA translation. Support for this can be added in a follow on patch series.",
    "evidence": "osv:CVE-2024-26761",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.1.80",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.19",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.7.7",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2024-26761",
      "aliases": [
        "CVE-2024-26761"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "34e37b4c432cd0f1842b352fde4b8878b4166888"
                },
                {
                  "fixed": "031217128990d7f0ab8c46db1afb3cf1e075fd29"
                },
                {
                  "fixed": "2cc1a530ab31c65b52daf3cb5d0883c8b614ea69"
                },
                {
                  "fixed": "3a3181a71935774bda2398451256d7441426420b"
                },
                {
                  "fixed": "0cab687205986491302cd2e440ef1d253031c221"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26761.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.19.0"
                },
                {
                  "fixed": "6.1.80"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.2.0"
                },
                {
                  "fixed": "6.6.19"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.7.7"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-26761.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:21.792497665Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/031217128990d7f0ab8c46db1afb3cf1e075fd29",
        "https://git.kernel.org/stable/c/0cab687205986491302cd2e440ef1d253031c221",
        "https://git.kernel.org/stable/c/2cc1a530ab31c65b52daf3cb5d0883c8b614ea69",
        "https://git.kernel.org/stable/c/3a3181a71935774bda2398451256d7441426420b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/26xxx/CVE-2024-26761.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-26761",
        "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/2024/26xxx/CVE-2024-26761.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-26761",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 487499,
  "published_at": "2024-04-03T17:00:44.934+00:00"
}