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CVE-2025-39982— Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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hci_acl_create_conn_sync和hci_le_create_conn_sync中存在释放后重用问题，可能导致内存损坏。

CVSS 8.8 · High EPSS 0.28% · P20 Updated Oct 16, 2026

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`aef2aa4fa98e18ea5d9345bf777ee698c8598728< 6243bda271a628c48875e3e473206e7f584892ce`	affected
		`aef2aa4fa98e18ea5d9345bf777ee698c8598728< bcce99f613163a43de24674b717e7a6c135fc879`	affected
		`aef2aa4fa98e18ea5d9345bf777ee698c8598728< 484c7d571a3d1b3fd298fa691b660438c4548a53`	affected
		`aef2aa4fa98e18ea5d9345bf777ee698c8598728< a78fd4fc5694ecb3b97deb2ad9eaebd67b4d2b08`	affected
		`aef2aa4fa98e18ea5d9345bf777ee698c8598728< 9e622804d57e2d08f0271200606bd1270f75126f`	affected
		`5.18`	affected
		`< 5.18`	unaffected
		`6.1.155≤ 6.1.*`	unaffected
… +4 more rows

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I. Basic Information for CVE-2025-39982

Vulnerability Information

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Vulnerability Title

Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync This fixes the following UFA in hci_acl_create_conn_sync where a connection still pending is command submission (conn->state == BT_OPEN) maybe freed, also since this also can happen with the likes of hci_le_create_conn_sync fix it as well: BUG: KASAN: slab-use-after-free in hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861 Write of size 2 at addr ffff88805ffcc038 by task kworker/u11:2/9541 CPU: 1 UID: 0 PID: 9541 Comm: kworker/u11:2 Not tainted 6.16.0-rc7 #3 PREEMPT(full) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-1ubuntu1 04/01/2014 Workqueue: hci3 hci_cmd_sync_work Call Trace: <TASK> dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x230 mm/kasan/report.c:480 kasan_report+0x118/0x150 mm/kasan/report.c:593 hci_acl_create_conn_sync+0x5ef/0x790 net/bluetooth/hci_sync.c:6861 hci_cmd_sync_work+0x210/0x3a0 net/bluetooth/hci_sync.c:332 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 home/kwqcheii/source/fuzzing/kernel/kasan/linux-6.16-rc7/arch/x86/entry/entry_64.S:245 </TASK> Allocated by task 123736: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:377 [inline] __kasan_kmalloc+0x93/0xb0 mm/kasan/common.c:394 kasan_kmalloc include/linux/kasan.h:260 [inline] __kmalloc_cache_noprof+0x230/0x3d0 mm/slub.c:4359 kmalloc_noprof include/linux/slab.h:905 [inline] kzalloc_noprof include/linux/slab.h:1039 [inline] __hci_conn_add+0x233/0x1b30 net/bluetooth/hci_conn.c:939 hci_conn_add_unset net/bluetooth/hci_conn.c:1051 [inline] hci_connect_acl+0x16c/0x4e0 net/bluetooth/hci_conn.c:1634 pair_device+0x418/0xa70 net/bluetooth/mgmt.c:3556 hci_mgmt_cmd+0x9c9/0xef0 net/bluetooth/hci_sock.c:1719 hci_sock_sendmsg+0x6ca/0xef0 net/bluetooth/hci_sock.c:1839 sock_sendmsg_nosec net/socket.c:712 [inline] __sock_sendmsg+0x219/0x270 net/socket.c:727 sock_write_iter+0x258/0x330 net/socket.c:1131 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x54b/0xa90 fs/read_write.c:686 ksys_write+0x145/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f Freed by task 103680: kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x46/0x50 mm/kasan/generic.c:576 poison_slab_object mm/kasan/common.c:247 [inline] __kasan_slab_free+0x62/0x70 mm/kasan/common.c:264 kasan_slab_free include/linux/kasan.h:233 [inline] slab_free_hook mm/slub.c:2381 [inline] slab_free mm/slub.c:4643 [inline] kfree+0x18e/0x440 mm/slub.c:4842 device_release+0x9c/0x1c0 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x22b/0x480 lib/kobject.c:737 hci_conn_cleanup net/bluetooth/hci_conn.c:175 [inline] hci_conn_del+0x8ff/0xcb0 net/bluetooth/hci_conn.c:1173 hci_conn_complete_evt+0x3c7/0x1040 net/bluetooth/hci_event.c:3199 hci_event_func net/bluetooth/hci_event.c:7477 [inline] hci_event_packet+0x7e0/0x1200 net/bluetooth/hci_event.c:7531 hci_rx_work+0x46a/0xe80 net/bluetooth/hci_core.c:4070 process_one_work kernel/workqueue.c:3238 [inline] process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 home/kwqcheii/sour ---truncated---

Source: 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

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Linux kernel 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	aef2aa4fa98e18ea5d9345bf777ee698c8598728 ~ 6243bda271a628c48875e3e473206e7f584892ce	-
Linux	Linux	5.18	-

II. Public POCs for CVE-2025-39982

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

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III. Intelligence Information for CVE-2025-39982

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https://www.cve.org/CVERecord?id=CVE-2025-39982

Same Patch Batch · Linux · 2025-10-15 · 34 CVEs total

CVE-2025-39975	9.8 CRITICAL	smb: client: fix wrong index reference in smb2_compound_op()
CVE-2025-39973	8.8 HIGH	i40e: add validation for ring_len param
CVE-2025-39969	8.8 HIGH	i40e: fix validation of VF state in get resources
CVE-2025-39972	8.8 HIGH	i40e: fix idx validation in i40e_validate_queue_map
CVE-2025-39971	8.8 HIGH	i40e: fix idx validation in config queues msg
CVE-2025-39970	8.8 HIGH	i40e: fix input validation logic for action_meta
CVE-2025-40000	8.8 HIGH	wifi: rtw89: fix use-after-free in rtw89_core_tx_kick_off_and_wait()
CVE-2025-39983	8.8 HIGH	Bluetooth: hci_event: Fix UAF in hci_conn_tx_dequeue
CVE-2025-39987	7.8 HIGH	can: hi311x: populate ndo_change_mtu() to prevent buffer overflow
CVE-2025-39976	7.8 HIGH	futex: Use correct exit on failure from futex_hash_allocate_default()
CVE-2025-39977	7.8 HIGH	futex: Prevent use-after-free during requeue-PI
CVE-2025-39978	7.8 HIGH	octeontx2-pf: Fix potential use after free in otx2_tc_add_flow()
CVE-2025-39979	7.8 HIGH	net/mlx5: fs, fix UAF in flow counter release
CVE-2025-39981	7.8 HIGH	Bluetooth: MGMT: Fix possible UAFs
CVE-2025-39985	7.8 HIGH	can: mcba_usb: populate ndo_change_mtu() to prevent buffer overflow
CVE-2025-39986	7.8 HIGH	can: sun4i_can: populate ndo_change_mtu() to prevent buffer overflow
CVE-2025-39988	7.8 HIGH	can: etas_es58x: populate ndo_change_mtu() to prevent buffer overflow
CVE-2025-39990	7.8 HIGH	bpf: Check the helper function is valid in get_helper_proto
CVE-2025-39993	7.8 HIGH	media: rc: fix races with imon_disconnect()
CVE-2025-39967	7.8 HIGH	fbcon: fix integer overflow in fbcon_do_set_font

Showing top 20 of 34 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux

V. Comments for CVE-2025-39982

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2025-39982— Bluetooth: hci_event: Fix UAF in hci_acl_create_conn_sync

Quick assessment

Possible ATT&CK Techniques 1 AI

Affected Version Matrix 12

I. Basic Information for CVE-2025-39982

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2025-39982

III. Intelligence Information for CVE-2025-39982

Same Patch Batch · Linux · 2025-10-15 · 34 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2025-39982

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