CVE-2026-74540— 蓝牙 L2CAP 在 l2cap_le_connect_rsp 中存在 UAF 漏洞
可能的 ATT&CK 技术 1AI
T1068 · Exploitation for Privilege Escalation影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | f1496dee9cbde2a62821f4441dadb0d3360f60c3< fd4c1e301bdec60a40728ea37de531cbccda501a | affected |
f1496dee9cbde2a62821f4441dadb0d3360f60c3< 522b730c62c53a1981604fd73524697fd347830d | affected | ||
f1496dee9cbde2a62821f4441dadb0d3360f60c3< 58e3c5289ad230a7e24ae4b0c7b43f5ee6e32136 | affected | ||
f1496dee9cbde2a62821f4441dadb0d3360f60c3< 09f447accc2570751e7d17f0dc0788b40d3edade | affected | ||
f1496dee9cbde2a62821f4441dadb0d3360f60c3< c4740e7f23ff9a8210198d8b4703259e21b9f69d | affected | ||
3.14 | affected | ||
< 3.14 | unaffected | ||
6.6.151≤ 6.6.* | unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-74540 基础信息
漏洞信息
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Vulnerability Title
Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: fix UAF in l2cap_le_connect_rsp l2cap_le_connect_rsp() obtains a channel via __l2cap_get_chan_by_ident() but neither holds a reference nor uses l2cap_chan_hold_unless_zero() before locking and operating on it. A concurrent l2cap_chan_del() triggered by a remote disconnect can free the channel between the lookup and l2cap_chan_lock(), causing a use-after-free. The BR/EDR counterpart l2cap_connect_rsp() and the sibling handler l2cap_le_command_rej() already use l2cap_chan_hold_unless_zero() to safely hold a reference, but l2cap_le_connect_rsp() was left unprotected. Fix by adding l2cap_chan_hold_unless_zero() after the ident lookup and l2cap_chan_put() on the exit path, consistent with other L2CAP response handlers.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
来源: CVE Program / CVE List V5
Vulnerability Type
N/A
来源: CVE Program / CVE List V5
受影响产品
二、漏洞 CVE-2026-74540 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-74540 补丁与修复 (5)
同批安全公告 · Linux · 2026-08-15 · 共 846 条
| CVE-2026-72421 | 10.0 CRITICAL | IPv4 fib 本地/主表忽略错误路由 |
| CVE-2026-74279 | 10.0 CRITICAL | Cavium CPT DMA清理使用错误循环索引 |
| CVE-2026-74475 | 10.0 CRITICAL | vxlan 短路由中 neigh_ha_snapshot() 使用错误 |
| CVE-2026-74280 | 10.0 CRITICAL | Marvell OCTEONTX 驱动 DMA清理循环索引错误漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | vdpa/octeon_ep 中断处理程序 IRQ 到环映射错误 |
| CVE-2026-72408 | 10.0 CRITICAL | Geneve GRO提示处理缺陷 |
| CVE-2026-72407 | 10.0 CRITICAL | Geneve 内核模块 inner network offset 验证漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | net: 在 enqueue_to_backlog() 中序列化 netif_running() 检查 |
| CVE-2026-72436 | 9.8 CRITICAL | Netfilter ipset 哈希类型锁读竞争漏洞 |
| CVE-2026-74433 | 9.8 CRITICAL | rxrpc rxgk_issue_challenge() Use-After-Free 漏洞 |
| CVE-2026-72422 | 9.8 CRITICAL | ksmbd 并发SMB2协商中conn->preauth_info Use-After-Free漏洞 |
| CVE-2026-72139 | 9.8 CRITICAL | Linux tcp_connect RCU宽限期后释放md5sig_info导致内存错误漏洞 |
| CVE-2026-72065 | 9.8 CRITICAL | mana 驱动网卡包长度验证漏洞 |
| CVE-2026-72064 | 9.8 CRITICAL | Mana驱动同步页面池RX碎片 |
| CVE-2026-74434 | 9.8 CRITICAL | rxrpc: 移动已窥视的OOB消息到待处理队列导致的漏洞 |
| CVE-2026-72299 | 9.8 CRITICAL | TIPC 限制 Enqueue 跟踪点中的套接字队列转储 |
| CVE-2026-74436 | 9.8 CRITICAL | Linux rxrpc 内核模块 Socket 拆除时竞态条件漏洞 |
| CVE-2026-72451 | 9.8 CRITICAL | Linux内核 xfrm状态缓存插入竞态条件漏洞 |
| CVE-2026-72041 | 9.8 CRITICAL | espintcp 部分发送修复漏洞 |
| CVE-2026-74495 | 9.8 CRITICAL | igbvf TX DMA错误清理内存泄漏漏洞 |
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IV. Related Vulnerabilities
V. Comments for CVE-2026-74540
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