{"vulnerability": "CVE-2025-21969", "sightings": [{"uuid": "d6f063c9-df52-4aa3-8c26-5ae6524f895a", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21969", "type": "seen", "source": "https://vulnerability.circl.lu/bundle/816dcc8e-f25a-4895-9b59-1bbd9caeccb8", "content": "", "creation_timestamp": "2025-12-03T14:14:49.267740Z"}, {"uuid": "85b04fd4-de57-4b1a-bf31-2c3ce476e93e", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "2a075640-a300-48a4-bb44-bc6130783b9b", "vulnerability": "CVE-2025-21969", "type": "seen", "source": "https://t.me/cvedetector/21791", "content": "{\n  \"Source\": \"CVE FEED\",\n  \"Title\": \"CVE-2025-21969 - Android Bluetooth L2CAP Slab-Use-After-Free Vulnerability\", \n  \"Content\": \"CVE ID : CVE-2025-21969 \nPublished : April 1, 2025, 4:15 p.m. | 1\u00a0hour, 15\u00a0minutes ago \nDescription : In the Linux kernel, the following vulnerability has been resolved:  \n  \nBluetooth: L2CAP: Fix slab-use-after-free Read in l2cap_send_cmd  \n  \nAfter the hci sync command releases l2cap_conn, the hci receive data work  \nqueue references the released l2cap_conn when sending to the upper layer.  \nAdd hci dev lock to the hci receive data work queue to synchronize the two.  \n  \n[1]  \nBUG: KASAN: slab-use-after-free in l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954  \nRead of size 8 at addr ffff8880271a4000 by task kworker/u9:2/5837  \n  \nCPU: 0 UID: 0 PID: 5837 Comm: kworker/u9:2 Not tainted 6.13.0-rc5-syzkaller-00163-gab75170520d4 #0  \nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024  \nWorkqueue: hci1 hci_rx_work  \nCall Trace:  \n   \n __dump_stack lib/dump_stack.c:94 [inline]  \n dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120  \n print_address_description mm/kasan/report.c:378 [inline]  \n print_report+0x169/0x550 mm/kasan/report.c:489  \n kasan_report+0x143/0x180 mm/kasan/report.c:602  \n l2cap_build_cmd net/bluetooth/l2cap_core.c:2964 [inline]  \n l2cap_send_cmd+0x187/0x8d0 net/bluetooth/l2cap_core.c:954  \n l2cap_sig_send_rej net/bluetooth/l2cap_core.c:5502 [inline]  \n l2cap_sig_channel net/bluetooth/l2cap_core.c:5538 [inline]  \n l2cap_recv_frame+0x221f/0x10db0 net/bluetooth/l2cap_core.c:6817  \n hci_acldata_packet net/bluetooth/hci_core.c:3797 [inline]  \n hci_rx_work+0x508/0xdb0 net/bluetooth/hci_core.c:4040  \n process_one_work kernel/workqueue.c:3229 [inline]  \n process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310  \n worker_thread+0x870/0xd30 kernel/workqueue.c:3391  \n kthread+0x2f0/0x390 kernel/kthread.c:389  \n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147  \n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244  \n   \n  \nAllocated by task 5837:  \n kasan_save_stack mm/kasan/common.c:47 [inline]  \n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68  \n poison_kmalloc_redzone mm/kasan/common.c:377 [inline]  \n __kasan_kmalloc+0x98/0xb0 mm/kasan/common.c:394  \n kasan_kmalloc include/linux/kasan.h:260 [inline]  \n __kmalloc_cache_noprof+0x243/0x390 mm/slub.c:4329  \n kmalloc_noprof include/linux/slab.h:901 [inline]  \n kzalloc_noprof include/linux/slab.h:1037 [inline]  \n l2cap_conn_add+0xa9/0x8e0 net/bluetooth/l2cap_core.c:6860  \n l2cap_connect_cfm+0x115/0x1090 net/bluetooth/l2cap_core.c:7239  \n hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline]  \n hci_remote_features_evt+0x68e/0xac0 net/bluetooth/hci_event.c:3726  \n hci_event_func net/bluetooth/hci_event.c:7473 [inline]  \n hci_event_packet+0xac2/0x1540 net/bluetooth/hci_event.c:7525  \n hci_rx_work+0x3f3/0xdb0 net/bluetooth/hci_core.c:4035  \n process_one_work kernel/workqueue.c:3229 [inline]  \n process_scheduled_works+0xa66/0x1840 kernel/workqueue.c:3310  \n worker_thread+0x870/0xd30 kernel/workqueue.c:3391  \n kthread+0x2f0/0x390 kernel/kthread.c:389  \n ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147  \n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244  \n  \nFreed by task 54:  \n kasan_save_stack mm/kasan/common.c:47 [inline]  \n kasan_save_track+0x3f/0x80 mm/kasan/common.c:68  \n kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:582  \n poison_slab_object mm/kasan/common.c:247 [inline]  \n __kasan_slab_free+0x59/0x70 mm/kasan/common.c:264  \n kasan_slab_free include/linux/kasan.h:233 [inline]  \n slab_free_hook mm/slub.c:2353 [inline]  \n slab_free mm/slub.c:4613 [inline]  \n kfree+0x196/0x430 mm/slub.c:4761  \n l2cap_connect_cfm+0xcc/0x1090 net/bluetooth/l2cap_core.c:7235  \n hci_connect_cfm include/net/bluetooth/hci_core.h:2057 [inline]  \n hci_conn_failed+0x287/0x400 net/bluetooth/hci_conn.c:1266  \n hci_abort_conn_sync+0x56c/0x11f0 net/bluetooth/hci_sync.c:5603  \n hci_cmd_sync_work+0x22b/0x400 net/bluetooth/hci_sync.c:332  \n proce[...]", "creation_timestamp": "2025-04-01T19:44:39.000000Z"}]}