s390/ap: use generic driver_override infrastructure

{
  "id": "ead6af8f68d8f3caa2cd1188b2f5c8774b199eb7f436688af91905411c81a171",
  "url": "https://osv.dev/vulnerability/CVE-2026-53116",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "s390/ap: use generic driver_override infrastructure",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: s390/ap: use generic driver_override infrastructure When the AP masks are updated via apmask_store() or aqmask_store(), ap_bus_revise_bindings() is called after ap_attr_mutex has been released. This calls __ap_revise_reserved(), which accesses the driver_override field without holding any lock, racing against a concurrent driver_override_store() that may free the old string, resulting in a potential UAF. Fix this by using the driver-core driver_override infrastructure, which protects all accesses with an internal spinlock. Note that unlike most other buses, the AP bus does not check driver_override in its match() callback; the override is checked in ap_device_probe() and __ap_revise_reserved() instead. Also note that we do not enable the driver_override feature of struct bus_type, as AP - in contrast to most other buses - passes \"\" to sysfs_emit() when the driver_override pointer is NULL. Thus, printing \"\\n\" instead of \"(null)\\n\". Additionally, AP has a custom counter that is modified in the corresponding custom driver_override_store().",
    "evidence": "osv:CVE-2026-53116",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "7.0.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-53116",
      "aliases": [
        "CVE-2026-53116"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "d38a87d7c0643db61e7a3bfc3ebeea2dc2568f7e"
                },
                {
                  "fixed": "8f2eca0570438b94602da1297353eb7b10dcb6cb"
                },
                {
                  "fixed": "81d6f7c3a70b10ff757ee8b5f8114a190871cf1e"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53116.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.0.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-53116.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.862245549Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/81d6f7c3a70b10ff757ee8b5f8114a190871cf1e",
        "https://git.kernel.org/stable/c/8f2eca0570438b94602da1297353eb7b10dcb6cb",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/53xxx/CVE-2026-53116.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-53116",
        "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/2026/53xxx/CVE-2026-53116.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-53116",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 493199,
  "published_at": "2026-06-24T16:30:47.982+00:00"
}