CVE-2026-72336— 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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于get_l2cap_conn()函数在释放hdev保护后仍使用L2CAP连接对象，可能导致释放后重用。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 6b8d4a6a03144c5996f98db7f8256267b0d72a3a< ba1f1ef6522e63aa5dd29805b4390ea2ccadf05e |
affected |
6b8d4a6a03144c5996f98db7f8256267b0d72a3a< d2a8dc1f619c9e0e4126bee795c39ebddd2ec8ff |
affected | ||
6b8d4a6a03144c5996f98db7f8256267b0d72a3a< 23a83bac3356e7b211bcdcf581a31f7b536a2c24 |
affected | ||
6b8d4a6a03144c5996f98db7f8256267b0d72a3a< 32c48c7f6cc8c7888e46a8c81622154ccafda5d2 |
affected | ||
6b8d4a6a03144c5996f98db7f8256267b0d72a3a< 518aa9505fa10ea5662349e5d2efd8c9e32a820b |
affected | ||
3.17 |
affected | ||
< 3.17 |
unaffected | ||
6.6.145≤ 6.6.* |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2026-72336 基础信息
漏洞信息
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Vulnerability Title
Bluetooth: 6lowpan: hold L2CAP conn across debugfs control
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: 6lowpan: hold L2CAP conn across debugfs control
get_l2cap_conn() looks up an LE hci_conn under hdev protection, but
then drops that protection before reading hcon->l2cap_data and before
lowpan_control_write() later dereferences conn->hcon. A disconnect or
device close can tear down the same L2CAP connection in that window.
The buggy scenario involves two paths, with each column showing the order
within that path:
6LoWPAN control write: HCI disconnect/device close:
1. get_l2cap_conn() finds hcon 1. hci_disconn_cfm() dispatches
and hcon->l2cap_data. the L2CAP disconnect callback.
2. get_l2cap_conn() drops hdev 2. l2cap_conn_del() clears
protection and returns conn. hcon->l2cap_data and drops the
L2CAP connection reference.
3. lowpan_control_write() reads 3. hci_conn_del() removes and drops
conn->hcon. the HCI connection.
Take a reference to the L2CAP connection with
l2cap_conn_hold_unless_zero() while hdev is still locked, and drop that
reference after the debugfs command's last use of conn. This mirrors the
existing L2CAP ACL receive-side handoff and keeps the connection
dereferenceable after leaving hdev protection. Export the existing helper
so the bluetooth_6lowpan module can use the same lifetime primitive.
Validation reproduced this kernel report:
BUG: KASAN: slab-use-after-free in lowpan_control_write+0x374/0x520
The buggy address belongs to the object at ffff888111b9d000 which belongs
to the cache kmalloc-1k of size 1024
The buggy address is located 0 bytes inside of freed 1024-byte region
[ffff888111b9d000, ffff888111b9d400)
Read of size 8
Call trace:
dump_stack_lvl+0x66/0xa0
print_report+0xce/0x5f0
lowpan_control_write+0x374/0x520 (net/bluetooth/6lowpan.c:1131)
srso_alias_return_thunk+0x5/0xfbef5
__virt_addr_valid+0x19f/0x330
kasan_report+0xe0/0x110
__debugfs_file_get+0xf7/0x400
full_proxy_write+0x9e/0xd0
vfs_write+0x1b0/0x810
ksys_write+0xd2/0x170
dnotify_flush+0x32/0x220
do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Allocated by task stack:
kasan_save_stack+0x33/0x60
kasan_save_track+0x17/0x60
__kasan_kmalloc+0xaa/0xb0
l2cap_conn_add+0x45/0x520
l2cap_chan_connect+0xac6/0xd90
l2cap_sock_connect+0x216/0x350
__sys_connect+0x101/0x130
__x64_sys_connect+0x40/0x50
do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)
entry_SYSCALL_64_after_hwframe+0x77/0x7f
Freed by task stack:
kasan_save_stack+0x33/0x60
kasan_save_track+0x17/0x60
kasan_save_free_info+0x3b/0x60
__kasan_slab_free+0x5f/0x80
kfree+0x313/0x590
hci_conn_hash_flush+0xc0/0x140
hci_dev_close_sync+0x41a/0xb00
hci_dev_close+0x12f/0x160
hci_sock_ioctl+0x157/0x570
sock_do_ioctl+0xf7/0x210
sock_ioctl+0x32f/0x490
__x64_sys_ioctl+0xc7/0x110
do_syscall_64+0x115/0x6a0 (arch/x86/entry/syscall_64.c:87)
entry_SYSCALL_64_after_hwframe+0x77/0x7f
kasan_record_aux_stack+0xa7/0xc0
insert_work+0x32/0x100
__queue_work+0x262/0xa60
queue_work_on+0xad/0xb0
l2cap_connect_cfm+0x4ef/0x670
hci_le_remote_feat_complete_evt+0x247/0x430
hci_event_packet+0x360/0x6f0
hci_rx_work+0x2ae/0x7a0
process_one_work+0x4fd/0xbc0
worker_thread+0x2d8/0x570
kthread+0x1ad/0x1f0
ret_from_fork+0x3c9/0x540
ret_from_fork_asm+0x1a/0x30
来源: CVE Program / CVE List V5
CVSS Information
N/A
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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于get_l2cap_conn()函数在释放hdev保护后仍使用L2CAP连接对象，可能导致释放后重用。
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-2026-72336 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-72336 补丁与修复 (5)
同批安全公告 · Linux · 2026-08-15 · 共 845 条
| CVE-2026-74475 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74280 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74279 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72407 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72408 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74309 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72421 | 10.0 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72493 | 9.9 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72463 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72248 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72381 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72477 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72473 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72472 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74406 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72222 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72226 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72137 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-74376 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2026-72130 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
显示前 20 条，共 845 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2026-72336
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