dpll: fix NULL pointer dereference in dpll_msg_add_pin_ref_sync()

{
  "id": "88e711d3eb10076819fe054aa203b0381aedf0fd3b9c1ae8af2ae2da85d4d666",
  "url": "https://osv.dev/vulnerability/CVE-2026-68378",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "dpll: fix NULL pointer dereference in dpll_msg_add_pin_ref_sync()",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: dpll: fix NULL pointer dereference in dpll_msg_add_pin_ref_sync() When a dpll_pin is shared across multiple dpll_device instances and those devices are being unregistered (e.g. during driver module removal), a NULL pointer dereference can occur in dpll_msg_add_pin_ref_sync(). This happens under the following conditions: - A pin is registered with two or more dpll devices (dpll_A, dpll_B) - The pin has ref_sync pairs with other pins - During unregistration of dpll_A's pins, a ref_sync partner pin is unregistered first, removing it from dpll_A->pin_refs - But since the partner pin is still registered with dpll_B, its dpll_refs is not empty, so dpll_pin_ref_sync_pair_del() does NOT run and the partner stays in the pin's ref_sync_pins xarray - When the pin itself is then unregistered from dpll_A, the delete notification calls dpll_msg_add_pin_ref_sync() which finds the partner in ref_sync_pins, passes dpll_pin_available() (partner is still registered with dpll_B), but dpll_pin_on_dpll_priv(dpll_A, partner) returns NULL because partner was already removed from dpll_A->pin_refs - The NULL priv pointer is passed to the driver's ref_sync_get callback, which dereferences it BUG: kernel NULL pointer dereference, address: 0000000000000034 Oops: Oops: 0000 [#1] SMP NOPTI RIP: 0010:zl3073x_dpll_input_pin_ref_sync_get+0x73/0x80 [zl3073x] Call Trace: dpll_msg_add_pin_ref_sync+0xb8/0x200 dpll_cmd_pin_get_one+0x3b6/0x4b0 dpll",
    "evidence": "osv:CVE-2026-68378",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.18.42",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "7.1.6",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "CVE-2026-68378",
      "aliases": [
        "CVE-2026-68378"
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "40466ea1827c46c6435fab9b21b63b80733e2d07"
                },
                {
                  "fixed": "66fbe0499ef517ab161b96c49886a891851f6481"
                }
              ]
            },
            {
              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "type": "GIT",
              "events": [
                {
                  "introduced": "58256a26bfb37a94738dd65618b1f31f460f8d91"
                },
                {
                  "fixed": "51c2fcc4cd2e4c52bd1970558f6e5356fdc51154"
                },
                {
                  "fixed": "4b3e6b9fdaeb40c6a2f7c41db3888b6ee628bdd2"
                },
                {
                  "fixed": "d2e914a4a0d0f753dbae830264850d044026167c"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68378.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.17.0"
                },
                {
                  "fixed": "6.18.42"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.19.0"
                },
                {
                  "fixed": "7.1.6"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-68378.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:29.432196533Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/4b3e6b9fdaeb40c6a2f7c41db3888b6ee628bdd2",
        "https://git.kernel.org/stable/c/51c2fcc4cd2e4c52bd1970558f6e5356fdc51154",
        "https://git.kernel.org/stable/c/66fbe0499ef517ab161b96c49886a891851f6481",
        "https://git.kernel.org/stable/c/d2e914a4a0d0f753dbae830264850d044026167c",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/68xxx/CVE-2026-68378.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-68378",
        "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/2026/68xxx/CVE-2026-68378.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-68378",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 496384,
  "published_at": "2026-08-10T12:03:56.59+00:00"
}