CVE-2026-77684

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NIST · via Voidly Atlas

CVE-2026-77684

This is the agency's own public-domain data, curated and made citable by Voidly. Voidly adds no independent claim — always verify against the linked canonical source.

cve id

CVE-2026-77684

published

2026-10-19T23:17:37.197

last modified

2026-10-19T23:17:37.197

status

Received

description

The Bluetooth Classic Hands-Free Profile HF role in subsys/bluetooth/host/classic/hfp_hf.c does not release the AT command buffers that are still queued on hf->tx_pending when the RFCOMM DLC goes down. hfp_hf_disconnected() only cancelled the work items and cleared hf->acl, and no other code path ever dequeues those buffers, so each one is permanently lost from the fixed hf_pool (CONFIG_BT_MAX_CONN + 1 buffers, i.e. two in the default configuration). The same function also left BT_HFP_HF_FLAG_CONNECTED set, and hfp_hf_create() wiped the object with memset() as soon as hf->acl was NULL, without checking whether hf->work, hf->slc_work or hf->deferred_work was still pending or running. The remote Audio Gateway peer controls the trigger end to end and needs no application involvement: an unsolicited +BCS: 1 response makes bcs_handle() call bt_hfp_hf_select_codec() and queue an AT+BCS buffer, which cannot be transmitted while BT_HFP_HF_FLAG_RX_ONGOING is set, and an immediately following RFCOMM DISC strands that buffer. Repeating the connect / +BCS / disconnect cycle a couple of times empties hf_pool for good. With the pool exhausted, HFP command sending fails permanently, and because

cvss score

5.7

cvss severity

MEDIUM

cvss vector

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

cwes

CWE-401

cpe count

0

Verify at NIST National Vulnerability Database ↗

Cite this record

CVE-2026-77684 — MEDIUM. NIST, via Voidly Atlas — Surveillance & Digital-Rights Watch. Retrieved 2026-10-20, https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-77684

@misc{voidly_nvd_cves_CVE202677684,
  title        = {CVE-2026-77684 — MEDIUM},
  author       = {{Voidly}},
  howpublished = {\url{https://voidly.ai/atlas/federal/nvd-cves/CVE-2026-77684}},
  note         = {Source: NIST National Vulnerability Database, https://nvd.nist.gov/vuln/detail/CVE-2026-77684. Public domain (17 U.S.C. §105); re-surfaced under CC BY 4.0},
  urldate      = {2026-10-20},
  year         = {2026}
}

Also available as JSON/BibTeX/APA: API record. Source data is U.S. federal public domain (17 U.S.C. §105). Re-surfaced by Voidly under CC BY 4.0.