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CVE-2026-10654— RFCOMM session-disconnect race leaks session/L2CAP and denies further RFCOMM service in Zephyr Bluetooth Classic

Quick assessment

Affected
zephyrproject zephyr
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 1.6.0版本至4.5.0之前版本存在竞争条件问题漏洞，该漏洞源于Zephyr Bluetooth Classic RFCOMM主机堆栈中存在竞争条件问题，当本地设备和相连对端同时发起双向会话断开时，可能导致会话永久挂起，底层L2CAP通道无法释放，会话池耗尽，从而拒绝RFCOMM服务。

CVSS 3.1 · Low EPSS 0.17% · P6

Affected Version Matrix 1

VendorProduct Version RangeStatus
zephyrproject zephyr 1.6.0< 4.5.0 affected
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I. Basic Information for CVE-2026-10654

Vulnerability Information
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Vulnerability Title
RFCOMM session-disconnect race leaks session/L2CAP and denies further RFCOMM service in Zephyr Bluetooth Classic
Source: CVE Program / CVE List V5
Vulnerability Description
A race condition in the Zephyr Bluetooth Classic RFCOMM host stack (subsys/bluetooth/host/classic/rfcomm.c) mishandles a simultaneous bidirectional session disconnect. When the local device has initiated a session teardown (state BT_RFCOMM_STATE_DISCONNECTING, DISC sent, RTX timer armed) and the connected peer concurrently sends its own DISC frame for dlci 0, rfcomm_handle_disc() invokes rfcomm_session_disconnected(), which unconditionally forced the session to BT_RFCOMM_STATE_DISCONNECTED without ever calling bt_l2cap_chan_disconnect(). Because the recovery timer was also cancelled and a later UA is ignored in the DISCONNECTED state, the session becomes permanently wedged: the underlying L2CAP channel is never released and the session slot in the fixed bt_rfcomm_pool[CONFIG_BT_MAX_CONN] array is never reclaimed (its conn pointer stays set). Subsequent bt_rfcomm_dlc_connect() calls on that connection fail with -EINVAL due to the invalid session state, so RFCOMM service is denied for that peer, and repeated occurrences can exhaust the session pool. The DISC frame is peer-controlled over the air, but exploitation requires the peer's DISC to collide with a local-initiated disconnect (a high-complexity timing race). Impact is availability/resource-leak only; there is no memory-safety, confidentiality, or integrity consequence. The defect shipped in released versions (present in v4.4.0 and earlier). The fix only transitions to DISCONNECTED when the session is not already in DISCONNECTING, preserving the proper L2CAP teardown path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
Zephyr 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Zephyr是Zephyr组织开源的一个可扩展的实时操作系统 (RTOS)。 Zephyr 1.6.0版本至4.5.0之前版本存在竞争条件问题漏洞，该漏洞源于Zephyr Bluetooth Classic RFCOMM主机堆栈中存在竞争条件问题，当本地设备和相连对端同时发起双向会话断开时，可能导致会话永久挂起，底层L2CAP通道无法释放，会话池耗尽，从而拒绝RFCOMM服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zephyrproject zephyr 1.6.0 ~ 4.5.0 -

II. Public POCs for CVE-2026-10654

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III. Intelligence Information for CVE-2026-10654

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Patches & Fixes for CVE-2026-10654 (1)

Vendor Advisories for CVE-2026-10654 (1)

Same Patch Batch · zephyrproject · 2026-06-30 · 5 CVEs total

CVE-2026-9263 6.5 MEDIUM Out-of-bounds read in Bluetooth Controller ISOAL framed RX reassembly leaks adjacent memor
CVE-2026-10655 6.5 MEDIUM Use-after-free race in SNTP async client when closing the socket while the socket service
CVE-2026-10653 6.4 MEDIUM Non-atomic `net_buf` reference counts cause double-free / free-list corruption under concu
CVE-2026-10652 4.8 MEDIUM Out-of-bounds read in Zephyr DNS resolver TXT/SRV record parsing (unvalidated `rdlength`)

IV. Related Vulnerabilities

Same product: zephyr
Same vendor: zephyrproject
Same weakness: CWE-362

V. Comments for CVE-2026-10654

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