Answer in brief
CVE-2025-39860 records a Unknown severity vulnerability in Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
Answer in brief
CVE-2025-39860 records a Unknown severity vulnerability in Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen(). The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a2da00d1ea1abfb04f846638e210b5b5166e3c9c <964cbb198f9c46c2b2358cd1faffc04c1e8248cf || >=06f87c96216bc5cd1094c23492274f77f1d5dd3b <83e1d9892ef51785cf0760b7681436760dda435a || >=fbe5a2fed8156cc19eb3b956602b0a1dd46a302d <47f6090bcf75c369695d21c3f179db8a56bbbd49 || >=29fac18499332211b2615ade356e2bd8b3269f98 <2ca99fc3512a8074de20ee52a87b492dfcc41a4d || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <6077d16b5c0f65d571eee709de2f0541fb5ef0ca || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <306b0991413b482dbf5585b423022123bb505966 || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <3dff390f55ccd9ce12e91233849769b5312180c2 || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <862c628108562d8c7a516a900034823b381d3cba || 51822644a047eac2310fab0799b64e3430b5a111 || 82cdb2ccbe43337798393369f0ceb98699fe6037 || 10426afe65c8bf7b24dd0c7be4dcc65f86fc99f9 || >=5.4.253 <5.4.299 || >=5.10.190 <5.10.243 || >=5.15.126 <5.15.192 || >=6.1.45 <6.1.151 || >=4.14.322 <4.15 || >=4.19.291 <4.20 || >=6.4.10 <6.5 | 964cbb198f9c46c2b2358cd1faffc04c1e8248cf, 83e1d9892ef51785cf0760b7681436760dda435a, 47f6090bcf75c369695d21c3f179db8a56bbbd49, 2ca99fc3512a8074de20ee52a87b492dfcc41a4d, 6077d16b5c0f65d571eee709de2f0541fb5ef0ca, 306b0991413b482dbf5585b423022123bb505966, 3dff390f55ccd9ce12e91233849769b5312180c2, 862c628108562d8c7a516a900034823b381d3cba, 5.4.299, 5.10.243, 5.15.192, 6.1.151, 4.15, 4.20, 6.5 |
| Linux/Linuxgeneric | 6.5 | Not reported |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familygeneric | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCH328generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM324generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM328generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM332generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRH334 (24 V DC, 8xFO, CC)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230 V AC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230 V AC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24 V DC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24 V DC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230 V AC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230 V AC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen() syzbot reported the splat below without a repro. In the splat, a single thread calling bt_accept_dequeue() freed sk and touched it after that. The root cause would be the racy l2cap_sock_cleanup_listen() call added by the cited commit. bt_accept_dequeue() is called under lock_sock() except for l2cap_sock_release(). Two threads could see the same socket during the list iteration in bt_accept_dequeue(): CPU1 CPU2 (close()) ---- ---- sock_hold(sk) sock_hold(sk); lock_sock(sk) <-- block close() sock_put(sk) bt_accept_unlink(sk) sock_put(sk) <-- refcnt by bt_accept_enqueue() release_sock(sk) lock_sock(sk) sock_put(sk) bt_accept_unlink(sk) sock_put(sk) <-- last refcnt bt_accept_unlink(sk) <-- UAF Depending on the timing, the other thread could show up in the "Freed by task" part. Let's call l2cap_sock_cleanup_listen() under lock_sock() in l2cap_sock_release(). [0]: BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115 Read of size 4 at addr ffff88803b7eb1c4 by task syz.5.3276/16995 CPU: 3 UID: 0 PID: 16995 Comm: syz.5.3276 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115 spin_lock_bh include/linux/spinlock.h:356 [inline] release_sock+0x21/0x220 net/core/sock.c:3746 bt_accept_dequeue+0x505/0x600 net/bluetooth/af_bluetooth.c:312 l2cap_sock_cleanup_listen+0x5c/0x2a0 net/bluetooth/l2cap_sock.c:1451 l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1425 __sock_release+0xb3/0x270 net/socket.c:649 sock_close+0x1c/0x30 net/socket.c:1439 __fput+0x3ff/0xb70 fs/file_table.c:468 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2accf8ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb6cb1378 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000426fb RCX: 00007f2accf8ebe9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f2acd1b7da0 R08: 0000000000000001 R09: 00000012b6cb166f R10: 0000001b30e20000 R11: 0000000000000246 R12: 00007f2acd1b609c R13: 00007f2acd1b6090 R14: ffffffffffffffff R15: 00007ffdb6cb1490 </TASK> Allocated by task 5326: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_nopro ---truncated---
Quoted source text, attributed separately from HOL analysis.
A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/RUGGEDCOM RST2428P (generic), Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=a2da00d1ea1abfb04f846638e210b5b5166e3c9c <964cbb198f9c46c2b2358cd1faffc04c1e8248cf || >=06f87c96216bc5cd1094c23492274f77f1d5dd3b <83e1d9892ef51785cf0760b7681436760dda435a || >=fbe5a2fed8156cc19eb3b956602b0a1dd46a302d <47f6090bcf75c369695d21c3f179db8a56bbbd49 || >=29fac18499332211b2615ade356e2bd8b3269f98 <2ca99fc3512a8074de20ee52a87b492dfcc41a4d || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <6077d16b5c0f65d571eee709de2f0541fb5ef0ca || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <306b0991413b482dbf5585b423022123bb505966 || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <3dff390f55ccd9ce12e91233849769b5312180c2 || >=1728137b33c00d5a2b5110ed7aafb42e7c32e4a1 <862c628108562d8c7a516a900034823b381d3cba || 51822644a047eac2310fab0799b64e3430b5a111 || 82cdb2ccbe43337798393369f0ceb98699fe6037 || 10426afe65c8bf7b24dd0c7be4dcc65f86fc99f9 || >=5.4.253 <5.4.299 || >=5.10.190 <5.10.243 || >=5.15.126 <5.15.192 || >=6.1.45 <6.1.151 || >=4.14.322 <4.15 || >=4.19.291 <4.20 || >=6.4.10 <6.5 | 964cbb198f9c46c2b2358cd1faffc04c1e8248cf, 83e1d9892ef51785cf0760b7681436760dda435a, 47f6090bcf75c369695d21c3f179db8a56bbbd49, 2ca99fc3512a8074de20ee52a87b492dfcc41a4d, 6077d16b5c0f65d571eee709de2f0541fb5ef0ca, 306b0991413b482dbf5585b423022123bb505966, 3dff390f55ccd9ce12e91233849769b5312180c2, 862c628108562d8c7a516a900034823b381d3cba, 5.4.299, 5.10.243, 5.15.192, 6.1.151, 4.15, 4.20, 6.5 |
| Linux/Linuxgeneric | 6.5 | Not reported |
| Siemens/RUGGEDCOM RST2428Pgeneric | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familygeneric | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCH328generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM324generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM328generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XCM332generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRH334 (24 V DC, 8xFO, CC)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230 V AC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230V AC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (230 V AC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24 V DC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24V DC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (24 V DC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230 V AC, 12xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230V AC, 2x10G, 24xSFP, 8xSFP+)generic | >=0 <V3.3 | V3.3 |
| Siemens/SCALANCE XRM334 (2x230 V AC, 8xFO)generic | >=0 <V3.3 | V3.3 |
| Siemens/SIMATIC CN 4100generic | >=0 <V5.0 | V5.0 |
Published upstream
Sep 19, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 5, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen() syzbot reported the splat below without a repro. In the splat, a single thread calling bt_accept_dequeue() freed sk and touched it after that. The root cause would be the racy l2cap_sock_cleanup_listen() call added by the cited commit. bt_accept_dequeue() is called under lock_sock() except for l2cap_sock_release(). Two threads could see the same socket during the list iteration in bt_accept_dequeue(): CPU1 CPU2 (close()) ---- ---- sock_hold(sk) sock_hold(sk); lock_sock(sk) <-- block close() sock_put(sk) bt_accept_unlink(sk) sock_put(sk) <-- refcnt by bt_accept_enqueue() release_sock(sk) lock_sock(sk) sock_put(sk) bt_accept_unlink(sk) sock_put(sk) <-- last refcnt bt_accept_unlink(sk) <-- UAF Depending on the timing, the other thread could show up in the "Freed by task" part. Let's call l2cap_sock_cleanup_listen() under lock_sock() in l2cap_sock_release(). [0]: BUG: KASAN: slab-use-after-free in debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] BUG: KASAN: slab-use-after-free in do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115 Read of size 4 at addr ffff88803b7eb1c4 by task syz.5.3276/16995 CPU: 3 UID: 0 PID: 16995 Comm: syz.5.3276 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xcd/0x630 mm/kasan/report.c:482 kasan_report+0xe0/0x110 mm/kasan/report.c:595 debug_spin_lock_before kernel/locking/spinlock_debug.c:86 [inline] do_raw_spin_lock+0x26f/0x2b0 kernel/locking/spinlock_debug.c:115 spin_lock_bh include/linux/spinlock.h:356 [inline] release_sock+0x21/0x220 net/core/sock.c:3746 bt_accept_dequeue+0x505/0x600 net/bluetooth/af_bluetooth.c:312 l2cap_sock_cleanup_listen+0x5c/0x2a0 net/bluetooth/l2cap_sock.c:1451 l2cap_sock_release+0x5c/0x210 net/bluetooth/l2cap_sock.c:1425 __sock_release+0xb3/0x270 net/socket.c:649 sock_close+0x1c/0x30 net/socket.c:1439 __fput+0x3ff/0xb70 fs/file_table.c:468 task_work_run+0x14d/0x240 kernel/task_work.c:227 resume_user_mode_work include/linux/resume_user_mode.h:50 [inline] exit_to_user_mode_loop+0xeb/0x110 kernel/entry/common.c:43 exit_to_user_mode_prepare include/linux/irq-entry-common.h:225 [inline] syscall_exit_to_user_mode_work include/linux/entry-common.h:175 [inline] syscall_exit_to_user_mode include/linux/entry-common.h:210 [inline] do_syscall_64+0x3f6/0x4c0 arch/x86/entry/syscall_64.c:100 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f2accf8ebe9 Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007ffdb6cb1378 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4 RAX: 0000000000000000 RBX: 00000000000426fb RCX: 00007f2accf8ebe9 RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003 RBP: 00007f2acd1b7da0 R08: 0000000000000001 R09: 00000012b6cb166f R10: 0000001b30e20000 R11: 0000000000000246 R12: 00007f2acd1b609c R13: 00007f2acd1b6090 R14: ffffffffffffffff R15: 00007ffdb6cb1490 </TASK> Allocated by task 5326: kasan_save_stack+0x33/0x60 mm/kasan/common.c:47 kasan_save_track+0x14/0x30 mm/kasan/common.c:68 poison_kmalloc_redzone mm/kasan/common.c:388 [inline] __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:405 kasan_kmalloc include/linux/kasan.h:260 [inline] __do_kmalloc_node mm/slub.c:4365 [inline] __kmalloc_nopro ---truncated---
Quoted source text, attributed separately from HOL analysis.