Vulnerability-Lookup

CVE-2026-82389 (GCVE-0-2026-82389)

Vulnerability from cvelistv5 – Published: 2026-10-26 16:08 – Updated: 2026-10-26 17:37

Title

Bluetooth Classic HFP AG wipes an object still linked in the SDP request list on connect failure, causing a NULL dereference

Summary

In the Bluetooth Classic Hands-Free Profile Audio Gateway role, hfp_ag_create() in subsys/bluetooth/host/classic/hfp_ag.c starts an SDP discovery toward the peer, which links the embedded ag->sdp_param._node into the SDP client's pending request list in subsys/bluetooth/host/classic/sdp.c. If the subsequent bt_rfcomm_dlc_connect() call fails, bt_hfp_ag_connect() cleaned up by memset()-ing the entire AG object while that node was still linked, and while ag->slc_work could still be queued on the system work queue. An in-flight SDP discovery cannot be cancelled — bt_sdp_discover_cancel() is declared in the public header but has no implementation — so the request stays in the list with its func, pool and uuid pointers zeroed. The RFCOMM channel passed to bt_hfp_ag_connect() is taken from the peer's own SDP Hands-Free service record in the normal AG flow (bt_sdp_get_proto_param() performs no range validation, and samples/bluetooth/classic/handsfree_ag feeds the value straight through), so a remote BR/EDR device in radio range that advertises an RFCOMM channel outside the valid range 0x01..0x1e deterministically forces bt_rfcomm_dlc_connect() to fail and reach the wipe. Reading the peer's SDP record requires no pairing, and the peer can also trigger the failure by dropping the ACL or racing an RFCOMM DLC on the same DLCI at the right moment. When the SDP client next advances its request list, sdp_client_discover() dereferences the zeroed parameters — net_buf_alloc(param->pool, …) with a NULL pool and param->uuid->type — and the result-notification paths call through the NULL params->func. Zeroing a linked node also truncates the request list behind a stale tail pointer, and re-arming the freed AG slot re-appends the same node and can produce a self-looping list that hangs the Bluetooth RX thread. The impact is a crash or hang of the Bluetooth stack; the written value is a constant zero at a fixed static address, so no attacker-controlled write is available. Only builds with CONFIG_BT_CLASSIC and CONFIG_BT_HFP_AG that use the Audio Gateway role are affected.

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-26 16:49 UTC

CWE

CWE-476 - memory-safety

Assigner

zephyr CNA under the mitre root

CNA scorecard B 77/100 over 202 records in the last 180 days details

References

2 references

URL	Tags
https://github.com/zephyrproject-rtos/zephyr/comm…	patch
https://github.com/zephyrproject-rtos/zephyr/secu…

Impacted products

1 product

Vendor	Product	Version	CPE status
zephyrproject	zephyr	Affected: 4.4.0 , < 4.5.0 (semver)	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-82389

Vulnerability from fkie_nvd - Published: 2026-10-26 17:17 - Updated: 2026-10-26 18:34

Severity

6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	vulnerabilities@zephyrproject.org	https://github.com/zephyrproject-rtos/zephyr/commit/18a3243b21ef6298988a3034dbda2704a7ad73a4
	vulnerabilities@zephyrproject.org	https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-rrqj-542q-26jm

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
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          "collectionURL": "https://github.com/zephyrproject-rtos/zephyr",
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    }
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  "lastModified": "2026-10-26T18:34:17.050",
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        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "vulnerabilities@zephyrproject.org",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-82389",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-26T16:49:22.774483Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-10-26T17:17:30.757",
  "references": [
    {
      "source": "vulnerabilities@zephyrproject.org",
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/18a3243b21ef6298988a3034dbda2704a7ad73a4"
    },
    {
      "source": "vulnerabilities@zephyrproject.org",
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-rrqj-542q-26jm"
    }
  ],
  "sourceIdentifier": "vulnerabilities@zephyrproject.org",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "vulnerabilities@zephyrproject.org",
      "type": "Secondary"
    }
  ]
}

UBUNTU-CVE-2026-82389 (CVE-2026-82389)

Vulnerability from osv_ubuntu – Published: 2026-10-27 00:00 – Updated: 2026-10-27 00:00 – Source website

Details

Severity

6.5 (Medium)


                    
                      CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-82389	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-82389	REPORT
	https://github.com/zephyrproject-rtos/zephyr	REPORT
	https://github.com/cveproject/cvelistv5/tree/main…	REPORT
	https://github.com/zephyrproject-rtos/zephyr/comm…	REPORT
	https://github.com/zephyrproject-rtos/zephyr/secu…	REPORT
	https://nvd.nist.gov/vuln/detail/cve-2026-82389	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build1"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build1"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build1"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build1"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1",
        "3.1.2-1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build2"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build2"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build2"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build2"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build2?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1build1",
        "3.1.2-1build2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build3?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1build3"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1build3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-1build3?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1build3"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-1.1build1"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-1.1build1"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-1.1build1"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-1.1build1"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-1.1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-1.1build1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1.1",
        "3.1.2-1.1build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-4?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libzephyr4",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "libzephyr4-krb5",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-clients",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-server",
            "binary_version": "3.1.2-4"
          },
          {
            "binary_name": "zephyr-server-krb5",
            "binary_version": "3.1.2-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "zephyr",
        "purl": "pkg:deb/ubuntu/zephyr@3.1.2-4?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.2-1.1build1",
        "3.1.2-4"
      ]
    }
  ],
  "aliases": [],
  "details": "In the Bluetooth Classic Hands-Free Profile Audio Gateway role, hfp_ag_create() in subsys/bluetooth/host/classic/hfp_ag.c starts an SDP discovery toward the peer, which links the embedded ag-\u003esdp_param._node into the SDP client\u0027s pending request list in subsys/bluetooth/host/classic/sdp.c. If the subsequent bt_rfcomm_dlc_connect() call fails, bt_hfp_ag_connect() cleaned up by memset()-ing the entire AG object while that node was still linked, and while ag-\u003eslc_work could still be queued on the system work queue. An in-flight SDP discovery cannot be cancelled \u2014 bt_sdp_discover_cancel() is declared in the public header but has no implementation \u2014 so the request stays in the list with its func, pool and uuid pointers zeroed. The RFCOMM channel passed to bt_hfp_ag_connect() is taken from the peer\u0027s own SDP Hands-Free service record in the normal AG flow (bt_sdp_get_proto_param() performs no range validation, and samples/bluetooth/classic/handsfree_ag feeds the value straight through), so a remote BR/EDR device in radio range that advertises an RFCOMM channel outside the valid range 0x01..0x1e deterministically forces bt_rfcomm_dlc_connect() to fail and reach the wipe. Reading the peer\u0027s SDP record requires no pairing, and the peer can also trigger the failure by dropping the ACL or racing an RFCOMM DLC on the same DLCI at the right moment. When the SDP client next advances its request list, sdp_client_discover() dereferences the zeroed parameters \u2014 net_buf_alloc(param-\u003epool, \u2026) with a NULL pool and param-\u003euuid-\u003etype \u2014 and the result-notification paths call through the NULL params-\u003efunc. Zeroing a linked node also truncates the request list behind a stale tail pointer, and re-arming the freed AG slot re-appends the same node and can produce a self-looping list that hangs the Bluetooth RX thread. The impact is a crash or hang of the Bluetooth stack; the written value is a constant zero at a fixed static address, so no attacker-controlled write is available. Only builds with CONFIG_BT_CLASSIC and CONFIG_BT_HFP_AG that use the Audio Gateway role are affected.",
  "id": "UBUNTU-CVE-2026-82389",
  "modified": "2026-10-27T00:00:00Z",
  "published": "2026-10-27T00:00:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-82389"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-82389"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zephyrproject-rtos/zephyr"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/cveproject/cvelistv5/tree/main/cves/2026/82xxx/cve-2026-82389.json"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zephyrproject-rtos/zephyr/commit/18a3243b21ef6298988a3034dbda2704a7ad73a4"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/zephyrproject-rtos/zephyr/security/advisories/ghsa-rrqj-542q-26jm"
    },
    {
      "type": "REPORT",
      "url": "https://nvd.nist.gov/vuln/detail/cve-2026-82389"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-82389"
  ]
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-82389 (GCVE-0-2026-82389)

FKIE_CVE-2026-82389

UBUNTU-CVE-2026-82389 (CVE-2026-82389)

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