CVE-2026-64434— Linux kernel 安全漏洞
一分钟漏洞结论
影响对象
Linux Linux
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。
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于Bluetooth L2CAP子系统中l2cap_chan_timeout()函数在连接拆除后仍访问已释放的chan->conn对象，导致释放后重用。
影响版本矩阵 26
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 3634cbdc2eb414b69ffa752ddbe5e0458518e321< 8f90405a4a6f1f1880dc07996b47bf57c712bd8a |
affected |
e1c100e2d61bd8c718b7d91fe3e050780a9bf72d< 32d783cafb46ff3ca58e6f9fd62c9c5f35eaf26b |
affected | ||
deb8493a8fa599f6c95e2465b12bfdfb7f94a1d9< 8922c7940bae9ce4b1736dddb6362370793835c2 |
affected | ||
89dec92041717b027216e110599e4f6d6c921b79< 91047a4396a8b1857a6f712a90cf33ec0012b189 |
affected | ||
50dfec218808b148ab4247b1858031b7a32015c5< 0b0e2bf39cf99e458d991b9df253727e036a7d7d |
affected | ||
859d3ace791ed878ae9ba5522c7844d960da8f88< d3b739db5dc6f688a60d56da872fabaf65246032 |
affected | ||
8c8e620467a7b51562dbcefbd1f09f288d7d710d< 50c38d9f42a529691e4e67ea9cedf4f0bfc8d277 |
affected | ||
8c8e620467a7b51562dbcefbd1f09f288d7d710d< b66774b48dd98f07254951f74ea6f513efe7ff8b |
affected | ||
| … +18 条更多 | |||
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一、 漏洞 CVE-2026-64434 基础信息
漏洞信息
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Vulnerability Title
Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix UAF in channel timeout by holding conn ref
l2cap_chan_timeout() runs asynchronously and accesses chan->conn. If
the connection is torn down while the timer is running or pending,
chan->conn can be freed, leading to a use-after-free when the timer
worker attempts to lock conn->lock:
| BUG: KASAN: slab-use-after-free in instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
| BUG: KASAN: slab-use-after-free in atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline]
| BUG: KASAN: slab-use-after-free in __mutex_trylock_fast kernel/locking/mutex.c:161 [inline]
| BUG: KASAN: slab-use-after-free in mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318
| Write of size 8 at addr ffff8881298d9550 by task kworker/2:1/83
|
| CPU: 2 UID: 0 PID: 83 Comm: kworker/2:1 Not tainted 7.1.0-rc6-next-20260601-dirty #6 PREEMPT(full)
| Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.17.0-debian-1.17.0-1 04/01/2014
| Workqueue: events l2cap_chan_timeout
| Call Trace:
| <TASK>
| instrument_atomic_read_write include/linux/instrumented.h:112 [inline]
| atomic_long_try_cmpxchg_acquire include/linux/atomic/atomic-instrumented.h:4456 [inline]
| __mutex_trylock_fast kernel/locking/mutex.c:161 [inline]
| mutex_lock+0x4f/0xa0 kernel/locking/mutex.c:318
| l2cap_chan_timeout+0x5d/0x1b0 net/bluetooth/l2cap_core.c:422
| process_one_work kernel/workqueue.c:3326 [inline]
| process_scheduled_works+0x7c8/0xfb0 kernel/workqueue.c:3409
| worker_thread+0x8a9/0xcf0 kernel/workqueue.c:3490
| kthread+0x346/0x430 kernel/kthread.c:436
| ret_from_fork+0x1a3/0x470 arch/x86/kernel/process.c:158
| ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
| </TASK>
|
| Allocated by task 320:
| l2cap_conn_add+0xa7/0x820 net/bluetooth/l2cap_core.c:7075
| l2cap_connect_cfm+0xdb/0xd70 net/bluetooth/l2cap_core.c:7452
| hci_connect_cfm include/net/bluetooth/hci_core.h:2139 [inline]
| hci_remote_features_evt+0x52f/0x9f0 net/bluetooth/hci_event.c:3760
| hci_event_func net/bluetooth/hci_event.c:7796 [inline]
| hci_event_packet+0x561/0xa70 net/bluetooth/hci_event.c:7847
| hci_rx_work+0x370/0x890 net/bluetooth/hci_core.c:4040
| process_one_work kernel/workqueue.c:3326 [inline]
| process_scheduled_works+0x7c8/0xfb0 kernel/workqueue.c:3409
| worker_thread+0x8a9/0xcf0 kernel/workqueue.c:3490
| kthread+0x346/0x430 kernel/kthread.c:436
| ret_from_fork+0x1a3/0x470 arch/x86/kernel/process.c:158
| ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
|
| Freed by task 322:
| hci_disconn_cfm include/net/bluetooth/hci_core.h:2154 [inline]
| hci_conn_hash_flush+0x101/0x1f0 net/bluetooth/hci_conn.c:2736
| hci_dev_close_sync+0x889/0xde0 net/bluetooth/hci_sync.c:5405
| hci_dev_do_close net/bluetooth/hci_core.c:502 [inline]
| hci_unregister_dev+0x1f7/0x370 net/bluetooth/hci_core.c:2679
| vhci_release+0x12a/0x180 drivers/bluetooth/hci_vhci.c:690
| __fput+0x369/0x890 fs/file_table.c:510
| task_work_run+0x160/0x1d0 kernel/task_work.c:233
| get_signal+0xf5b/0x1120 kernel/signal.c:2810
| arch_do_signal_or_restart+0x4d/0x600 arch/x86/kernel/signal.c:337
| __exit_to_user_mode_loop kernel/entry/common.c:64 [inline]
| exit_to_user_mode_loop+0x85/0x510 kernel/entry/common.c:98
| do_syscall_64+0x263/0x3d0 arch/x86/entry/syscall_64.c:100
| entry_SYSCALL_64_after_hwframe+0x77/0x7f
|
| The buggy address belongs to the object at ffff8881298d9400
| which belongs to the cache kmalloc-512 of size 512
| The buggy address is located 336 bytes inside of
| freed 512-byte region [ffff8881298d9400, ffff8881298d9600)
Fix it by having chan->conn hold a reference to l2cap_conn (via
l2cap_conn_get) when the channel is added to the connection, and
releasing it in the channel destructor. This ensures the l2cap_conn
remains alive as long as the channel exists.
A new FLAG_DEL channel flag is introduced to indicate that the ch
---truncated---
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
Vulnerability Title
Linux kernel 安全漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于Bluetooth L2CAP子系统中l2cap_chan_timeout()函数在连接拆除后仍访问已释放的chan->conn对象，导致释放后重用。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
二、漏洞 CVE-2026-64434 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-64434 补丁与修复 (7)
同批安全公告 · Linux · 2026-07-25 · 共 274 条
| CVE-2026-64355 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64459 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64303 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64439 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64410 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64399 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64397 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64391 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64387 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64386 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64385 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64383 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64384 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64268 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64523 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64269 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64320 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64319 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64257 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-64393 | 9.1 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 274 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-64434
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