Bluetooth: MGMT: Fix possible UAFs

{
  "id": "79fef22b3f769d65fe3ff4cde2f2a8cc5b9920cf98541a425150aaba4bd6d8d9",
  "url": "https://osv.dev/vulnerability/CVE-2025-39981",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Bluetooth: MGMT: Fix possible UAFs",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: Bluetooth: MGMT: Fix possible UAFs This attemps to fix possible UAFs caused by struct mgmt_pending being freed while still being processed like in the following trace, in order to fix mgmt_pending_valid is introduce and use to check if the mgmt_pending hasn't been removed from the pending list, on the complete callbacks it is used to check and in addtion remove the cmd from the list while holding mgmt_pending_lock to avoid TOCTOU problems since if the cmd is left on the list it can still be accessed and freed. BUG: KASAN: slab-use-after-free in mgmt_add_adv_patterns_monitor_sync+0x35/0x50 net/bluetooth/mgmt.c:5223 Read of size 8 at addr ffff8880709d4dc0 by task kworker/u11:0/55 CPU: 0 UID: 0 PID: 55 Comm: kworker/u11:0 Not tainted 6.16.4 #2 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Workqueue: hci0 hci_cmd_sync_work Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 mgmt_add_adv_patterns_monitor_sync+0x35/0x50 net/bluetooth/mgmt.c:5223 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x711/0x8a0 kernel/kthread.c:464 ret_",
    "evidence": "osv:CVE-2025-39981",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "6.6.140",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.12.59",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.16.10",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-39981",
      "aliases": [
        "CVE-2025-39981"
      ],
      "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": "cf75ad8b41d2aa06f98f365d42a3ae8b059daddd"
                },
                {
                  "fixed": "0b60eb04b8524e1b4b3f07fea0d16fda9a677d9a"
                },
                {
                  "fixed": "d71b98f253b079cbadc83266383f26fe7e9e103b"
                },
                {
                  "fixed": "87a1f16f07c6c43771754075e08f45b41d237421"
                },
                {
                  "fixed": "302a1f674c00dd5581ab8e493ef44767c5101aab"
                }
              ]
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39981.json"
          }
        },
        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "5.17.0"
                },
                {
                  "fixed": "6.6.140"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.7.0"
                },
                {
                  "fixed": "6.12.59"
                }
              ]
            },
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "6.13.0"
                },
                {
                  "fixed": "6.16.10"
                }
              ]
            }
          ],
          "package": {
            "name": "Kernel",
            "ecosystem": "Linux"
          },
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-39981.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:27.585644578Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0b60eb04b8524e1b4b3f07fea0d16fda9a677d9a",
        "https://git.kernel.org/stable/c/302a1f674c00dd5581ab8e493ef44767c5101aab",
        "https://git.kernel.org/stable/c/87a1f16f07c6c43771754075e08f45b41d237421",
        "https://git.kernel.org/stable/c/d71b98f253b079cbadc83266383f26fe7e9e103b",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39981.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-39981",
        "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/2025/39xxx/CVE-2025-39981.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-39981",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 494394,
  "published_at": "2025-10-15T07:56:00.959+00:00"
}