{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "08c30aca9e698faddebd34f81e1196295f9dc063"
            },
            {
              "fixed": "62ce8b33eb238cf18c15207332fbdc26d858f592"
            },
            {
              "fixed": "3873f3449701b3dc98cba577923be6493598e7a1"
            },
            {
              "fixed": "7ded3264106418c6456ccceaafd9fda596ce12c3"
            },
            {
              "fixed": "82425b14f0fb22e46cfddc56d6465570f5ed0ce6"
            },
            {
              "fixed": "1b7841ffad08e911e8c4b9470f3fa08423568940"
            },
            {
              "fixed": "946d76db77ee5f922968ce558629ae47b381e3fc"
            },
            {
              "fixed": "fbf7961964a6e93360179f64712320ae9a1e9577"
            },
            {
              "fixed": "759c185d0bbdb131357408f50b8735e04ed3caff"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "3.10.0"
            },
            {
              "fixed": "5.10.270"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.221"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.109"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.50"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89569.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nBluetooth: RFCOMM: serialize security confirmation handling\n\nrfcomm_security_cfm() looks up a session on session_list and then walks\nits DLC list without holding rfcomm_mutex. Since RFCOMM session teardown\nuses rfcomm_mutex, krfcommd can close and free the same session and DLCs\nconcurrently:\n\n  hci_rx_work                    krfcommd\n  -----------                    ---------\n  rfcomm_session_get()\n                                 rfcomm_lock()\n                                 rfcomm_session_close()\n                                   rfcomm_dlc_unlink()\n                                   rfcomm_session_del()\n                                     kfree(s)\n                                 rfcomm_unlock()\n  walk s-\u003edlcs\n\nThe callback can then read a freed session list head and touch freed DLCs\nwhile updating their flags or timers.\n\nSerialize the session lookup and DLC traversal in rfcomm_security_cfm()\nwith rfcomm_mutex. This matches the existing RFCOMM session lifetime\nrules and prevents concurrent rfcomm_session_del() / rfcomm_dlc_unlink()\nfrom tearing the objects down while the callback is using them.\n\nKASAN reported:\n\n  BUG: KASAN: slab-use-after-free in rfcomm_security_cfm+0x41c/0x440\n  Read of size 8 at addr ffff888111fb3960 by task kworker/u17:1/89\n  Workqueue: hci0 hci_rx_work\n  Call Trace:\n   rfcomm_security_cfm+0x41c/0x440\n   hci_encrypt_cfm+0x139/0x590\n   hci_encrypt_change_evt+0x37b/0xc40\n   hci_event_packet+0x71b/0xb20\n   hci_rx_work+0x293/0x730\n  Allocated by task 69:\n   rfcomm_session_add+0x9e/0x2f0\n   rfcomm_run+0x44b/0x41e0\n  Freed by task 69:\n   kfree+0x131/0x3c0\n   rfcomm_session_del+0x188/0x220\n   rfcomm_run+0x1985/0x41e0",
  "id": "CVE-2026-89569",
  "modified": "2026-09-15T03:31:08.205724387Z",
  "published": "2026-09-11T19:44:38.838Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1b7841ffad08e911e8c4b9470f3fa08423568940"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3873f3449701b3dc98cba577923be6493598e7a1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/62ce8b33eb238cf18c15207332fbdc26d858f592"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/759c185d0bbdb131357408f50b8735e04ed3caff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7ded3264106418c6456ccceaafd9fda596ce12c3"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/82425b14f0fb22e46cfddc56d6465570f5ed0ce6"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/946d76db77ee5f922968ce558629ae47b381e3fc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/fbf7961964a6e93360179f64712320ae9a1e9577"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89569.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89569"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Bluetooth: RFCOMM: serialize security confirmation handling"
}