firmware: arm_scmi: Quiesce notifications before teardown

{
  "id": "ae0214d637d075c1ee76aea718e3dc05b40ab4ea54e12500d739a567ee8843c3",
  "url": "https://osv.dev/vulnerability/CVE-2026-93091",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "firmware: arm_scmi: Quiesce notifications before teardown",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Quiesce notifications before teardown scmi_notification_exit() clears and releases the notification instance, but transport callbacks can still deliver incoming notifications until the TX/RX channels are freed. During remove, an RX interrupt in that window can enter scmi_notify() while notification state is being torn down and then dereference freed memory. The same ordering exists on the probe error path after notification initialization. The notification late-init worker has a separate lifetime issue: protocol event registration queues ni->init_work on the system workqueue, so destroying ni->notify_wq does not drain that work. If the devres group is released while init_work is still pending or running, the late-init worker can dereference the freed notification instance. Quiesce the notification core before TX/RX channels are torn down, then clean up the channels before releasing the notification core resources. Use disable_work_sync() so future late-init queueing is rejected and any already queued or running late-init work has completed before channel teardown starts.",
    "evidence": "osv:CVE-2026-93091",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.12.110",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.18.52",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.2.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-93091",
      "aliases": [
        "CVE-2026-93091"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "1e7cbfaa66d39e78bd24df0c78b55df68176b59e"
                },
                {
                  "fixed": "6778bcabd2e0c32f73476f0bc6369013692540be"
                },
                {
                  "fixed": "2aac23bc0a79af41104d99823bb250fae92ba144"
                },
                {
                  "fixed": "5e30d3d16d1a9e599be4dcea872874e65e2c277b"
                },
                {
                  "fixed": "8e49055d0d495c9c07575ad8e111d9eaf0efb13f"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93091.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.15.0"
                },
                {
                  "fixed": "6.12.110"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.18.52"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.2.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93091.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.968230267Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2aac23bc0a79af41104d99823bb250fae92ba144",
        "https://git.kernel.org/stable/c/5e30d3d16d1a9e599be4dcea872874e65e2c277b",
        "https://git.kernel.org/stable/c/6778bcabd2e0c32f73476f0bc6369013692540be",
        "https://git.kernel.org/stable/c/8e49055d0d495c9c07575ad8e111d9eaf0efb13f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93091.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-93091",
        "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/2026/93xxx/CVE-2026-93091.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-93091",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496878,
  "published_at": "2026-09-17T16:11:07.055+00:00"
}