CVE-2026-19739— 蓝牙LE控制器连接更新时意外LL控制PDU导致内存泄漏
一分钟漏洞结论
影响对象
zephyrproject zephyr
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
这段描述涉及蓝牙控制器（Bluetooth Controller）软件中链路层（Link Layer）控制程序的一个内存管理漏洞，可能导致拒绝服务（DoS）。以下是该漏洞描述信息的中文翻译： --- 在 中，蓝牙链路层控制程序的代码在等待连接更新（Connection Update）或连接参数更新（Connection Parameter）指令生效的“即刻时间”（instant）期间，会保留接收到的 RX 节点。该节点随后可用于承载主机通知（通过 函数标记为 ，从而抑制 中的正常回收机制）。 和 函数的默认分支——
可能的 ATT&CK 技术 1 AI
T1498 · Network Denial of Service影响版本矩阵 1
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| zephyrproject | zephyr | 3.4.0< 4.5.0 |
affected |
获取后续新漏洞提醒
登录后订阅
一、 漏洞 CVE-2026-19739 基础信息
漏洞信息
对漏洞内容有疑问？看看神龙的深度分析是否有帮助！
查看神龙十问 ↗
尽管我们使用了先进的大模型技术，但其输出仍可能包含不准确或过时的信息。神龙努力确保数据的准确性，但请您根据实际情况进行核实和判断。
Vulnerability Title
Bluetooth LE controller leaks a retained RX node when an unexpected LL Control PDU arrives during a Connection Update
来源: CVE Program / CVE List V5
Vulnerability Description
The Bluetooth Link Layer control procedure code in subsys/bluetooth/controller/ll_sw/ull_llcp_conn_upd.c retains the received RX node while a Connection Update / Connection Parameter procedure waits for its instant, so the node can later carry the host notification (llcp_rx_node_retain(), which marks it NODE_RX_TYPE_RETAIN and thereby suppresses the normal recycling in ull.c). The default: arm of llcp_rp_cu_rx() and llcp_lp_cu_rx() — the "invalid PDU, terminate the connection" path — completed the procedure without releasing that retained node. llcp_rr_check_done() then dequeued and freed the procedure context with ctx->node_ref.rx still pointing at the retained node, dropping the last reference to it.
A peer device in radio range can reach this without pairing, bonding, or encryption. Against a peripheral, the peer sends a well-formed LL_CONNECTION_UPDATE_IND with an instant a few connection events in the future (the node is retained and the procedure enters RP_CU_STATE_WAIT_INSTANT), then, before the instant is reached, sends any other LL Control PDU such as LL_LENGTH_REQ. ull_cp_rx() routes that PDU into the active remote Connection Update procedure, which takes the invalid-PDU path. The central role is reachable symmetrically after accepting an LL_CONNECTION_PARAM_REQ, and the local-procedure variant is reachable with LL_REJECT_IND.
With CONFIG_BT_CTLR_ASSERT_DEBUG enabled (its default), the resulting state violates the invariant asserted in llcp_rr_check_done(), so the two-PDU sequence produces an immediate fatal error in the controller. With those asserts disabled, each occurrence permanently loses one node from the controller's small fixed RX pool (sized from CONFIG_BT_CTLR_RX_BUFFERS, which defaults to 1); repeating the sequence across reconnections exhausts the pool, after which the link-layer receive path operates on a NULL node. The impact is an unauthenticated, remotely triggerable denial of service persisting until reboot; there is no memory-disclosure or memory-corruption consequence, since the leaked node simply becomes unreachable.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
来源: CVE Program / CVE List V5
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| zephyrproject | zephyr | 3.4.0 ~ 4.5.0 | - |
|
二、漏洞 CVE-2026-19739 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
AI 生成 POC
高级
未找到公开 POC。
登录以生成 AI POC三、漏洞 CVE-2026-19739 的情报信息
请登录查看更多情报信息。
CVE-2026-19739 补丁与修复 (1)
CVE-2026-19739 厂商安全公告 (1)
同批安全公告 · zephyrproject · 2026-10-11 · 共 11 条
| CVE-2026-19736 | 7.8 HIGH | NXP MCUX TRNG熵驱动越界写入漏洞 |
| CVE-2026-19669 | 7.8 HIGH | 燃料计量系统调用验证器无界变长数组导致内核栈溢出 |
| CVE-2026-19935 | 7.5 HIGH | Zephyr蓝牙协议栈L2CAP通道使用后释放漏洞 |
| CVE-2026-19577 | 7.1 HIGH | IPv6路由转发中越界读取漏洞 |
| CVE-2026-19576 | 6.8 MEDIUM | Goodix GT911 触摸屏控制器驱动栈外写入漏洞 |
| CVE-2026-19740 | 6.5 MEDIUM | 蓝牙LE控制器：PHY更新过程中的RX节点泄露和可达断言漏洞 |
| CVE-2026-19738 | 6.5 MEDIUM | 蓝牙控制器CIS创建过程中保留RX节点泄漏及可达断言漏洞 |
| CVE-2026-19737 | 5.5 MEDIUM | ESP32 I2S驱动空指针解引用漏洞 |
| CVE-2026-19735 | 4.8 MEDIUM | Zephyr TCP栈可预测TCP初始序列号漏洞 |
| CVE-2026-18418 | 3.4 LOW | zbus 代理代理越界读取漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-19739
暂无评论