i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()

{
  "id": "e88222a756ed8467ccb6e98292c95ccd67c08d445e11c1adb10ee50141b9f0c4",
  "url": "https://osv.dev/vulnerability/CVE-2026-80954",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: i3c: Fix unlocked dereference of dev->desc in i3c_device_get_supported_xfer_mode() i3c_device_get_supported_xfer_mode() uses dev->desc to obtain the master controller. However, dev->desc must not be dereferenced unless bus->lock is held, and this function does not take that lock. The function only needs access to the master controller associated with the device's bus. Use dev->bus instead, which is always valid for the lifetime of the device and does not require dereferencing dev->desc.",
    "evidence": "osv:CVE-2026-80954",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.2.4",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2026-80954",
      "aliases": [
        "CVE-2026-80954"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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": "256a21743d911f94ce92fe28f793cd586f3860b2"
                },
                {
                  "fixed": "251db58324ea4792c3f9f692ab09be148e051969"
                },
                {
                  "fixed": "8bed7f4fa710914b7f05fd59998316bfb4d43385"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80954.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.4"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-80954.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:50.424564438Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/251db58324ea4792c3f9f692ab09be148e051969",
        "https://git.kernel.org/stable/c/8bed7f4fa710914b7f05fd59998316bfb4d43385",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80954.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-80954",
        "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/2026/80xxx/CVE-2026-80954.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-80954",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 519025,
  "published_at": "2026-09-11T19:42:23.169+00:00"
}