CVE-2025-21969— 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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于Bluetooth L2CAP模块在l2cap_send_cmd中存在slab释放后读取问题。
影响版本矩阵 12
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| Linux | Linux | 9b3628d79b46f06157affc56fdb218fdd4988321< c96cce853542b3b13da3738f35ef1be8cfcc9d1d |
affected |
9b3628d79b46f06157affc56fdb218fdd4988321< f8094625a591eeb0b75b1bd9e713fac1d93f5ca9 |
affected | ||
9b3628d79b46f06157affc56fdb218fdd4988321< 7790a79c6fce8d5d552bc64f5c82819f719e4f28 |
affected | ||
9b3628d79b46f06157affc56fdb218fdd4988321< b4f82f9ed43aefa79bec2504ae8c29be0c0f5d1d |
affected | ||
995c917d6818b39308ac6baf3f6573cb0486a238 |
affected | ||
5.17.14< 5.18 |
affected | ||
5.18 |
affected | ||
< 5.18 |
unaffected | ||
| … +4 条更多 | |||
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一、 漏洞 CVE-2025-21969 基础信息
漏洞信息
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Vulnerability Title
Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd
来源: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved:
Bluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd
After the hci sync command releases l2cap_conn, the hci receive data work
queue references the released l2cap_conn when sending to the upper layer.
Add hci dev lock to the hci receive data work queue to synchronize the two.
[1]
BUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954
Read of size 8 at addr ffff8880271a4000 by task kworker/u9:2/5837
CPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
Workqueue: hci1 hci_rx_work
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:378 [inline]
print_report+0x169/0x550 mm/kasan/report.c:489
kasan_report+0x143/0x180 mm/kasan/report.c:602
l2cap_build_cmd net/bluetooth/l2cap_core.c:2964 [inline]
l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954
l2cap_sig_send_rej net/bluetooth/l2cap_core.c:5502 [inline]
l2cap_sig_channel net/bluetooth/l2cap_core.c:5538 [inline]
l2cap_recv_frame+0x221f/0x10db0 net/bluetooth/l2cap_core.c:6817
hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline]
hci_rx_work+0x508/0xdb0 net/bluetooth/hci_core.c:4040
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
</TASK>
Allocated by task 5837:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
__kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394
kasan_kmalloc include/linux/kasan.h:260 [inline]
__kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4329
kmalloc_noprof include/linux/slab.h:901 [inline]
kzalloc_noprof include/linux/slab.h:1037 [inline]
l2cap_conn_add+0xa9/0x8e0 net/bluetooth/l2cap_core.c:6860
l2cap_connect_cfm+0x115/0x1090 net/bluetooth/l2cap_core.c:7239
hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline]
hci_remote_features_evt+0x68e/0xac0 net/bluetooth/hci_event.c:3726
hci_event_func net/bluetooth/hci_event.c:7473 [inline]
hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7525
hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
Freed by task 54:
kasan_save_stack mm/kasan/common.c:47 [inline]
kasan_save_track+0x3f/0x80 mm/kasan/common.c:68
kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582
poison_slab_object mm/kasan/common.c:247 [inline]
__kasan_slab_free+0x59/0x70 mm/kasan/common.c:264
kasan_slab_free include/linux/kasan.h:233 [inline]
slab_free_hook mm/slub.c:2353 [inline]
slab_free mm/slub.c:4613 [inline]
kfree+0x196/0x430 mm/slub.c:4761
l2cap_connect_cfm+0xcc/0x1090 net/bluetooth/l2cap_core.c:7235
hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline]
hci_conn_failed+0x287/0x400 net/bluetooth/hci_conn.c:1266
hci_abort_conn_sync+0x56c/0x11f0 net/bluetooth/hci_sync.c:5603
hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332
process_one_work kernel/workqueue.c:3229 [inline]
process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310
worker_thread+0x870/0xd30 kernel/workqueue.c:3391
kthread+0x2f0/0x390 kernel/kthread.c:389
ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147
ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr
---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基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于Bluetooth L2CAP模块在l2cap_send_cmd中存在slab释放后读取问题。
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-2025-21969 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2025-21969 补丁与修复 (2)
同批安全公告 · Linux · 2025-04-01 · 共 93 条
| CVE-2025-21954 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21927 | 9.8 CRITICAL | Linux kernel 安全漏洞 |
| CVE-2025-21955 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21946 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21945 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21967 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21972 | 8.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21947 | 8.1 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21971 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21970 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21899 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21979 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21901 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21926 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21966 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21965 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21934 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21939 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21958 | 7.8 HIGH | Linux kernel 安全漏洞 |
| CVE-2025-21949 | 7.8 HIGH | Linux kernel 安全漏洞 |
显示前 20 条，共 93 条。 查看全部 → →
IV. Related Vulnerabilities
V. Comments for CVE-2025-21969
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