[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"repo-stars":3,"vuln-DEBIAN-CVE-2022-49909":6},{"stargazers_count":4,"fetched_at":5},7,"2026-06-04T08:53:30.047Z",{"id":7,"descriptions":8,"cisa":9,"weaknesses":10,"exploits":11,"aliases":12,"duplicate_of":9,"upstream":13,"downstream":16,"duplicates":17,"related":18,"reserved_at":9,"published_at":19,"modified_at":20,"state":9,"summary":21,"references_raw":23,"kevs":30,"epss":9,"epss_history":31,"metrics":32,"affected":39},"DEBIAN-CVE-2022-49909","In the Linux kernel, the following vulnerability has been resolved:  Bluetooth: L2CAP: fix use-after-free in l2cap_conn_del()  When l2cap_recv_frame() is invoked to receive data, and the cid is L2CAP_CID_A2MP, if the channel does not exist, it will create a channel. However, after a channel is created, the hold operation of the channel is not performed. In this case, the value of channel reference counting is 1. As a result, after hci_error_reset() is triggered, l2cap_conn_del() invokes the close hook function of A2MP to release the channel. Then  l2cap_chan_unlock(chan) will trigger UAF issue.  The process is as follows: Receive data: l2cap_data_channel()     a2mp_channel_create()  --->channel ref is 2     l2cap_chan_put()       --->channel ref is 1  Triger event:     hci_error_reset()         hci_dev_do_close()         ...         l2cap_disconn_cfm()             l2cap_conn_del()                 l2cap_chan_hold()    --->channel ref is 2                 l2cap_chan_del()     --->channel ref is 1                 a2mp_chan_close_cb() --->channel ref is 0, release channel                 l2cap_chan_unlock()  --->UAF of channel  The detailed Call Trace is as follows: BUG: KASAN: use-after-free in __mutex_unlock_slowpath+0xa6/0x5e0 Read of size 8 at addr ffff8880160664b8 by task kworker/u11:1/7593 Workqueue: hci0 hci_error_reset Call Trace:  \u003CTASK>  dump_stack_lvl+0xcd/0x134  print_report.cold+0x2ba/0x719  kasan_report+0xb1/0x1e0  kasan_check_range+0x140/0x190  __mutex_unlock_slowpath+0xa6/0x5e0  l2cap_conn_del+0x404/0x7b0  l2cap_disconn_cfm+0x8c/0xc0  hci_conn_hash_flush+0x11f/0x260  hci_dev_close_sync+0x5f5/0x11f0  hci_dev_do_close+0x2d/0x70  hci_error_reset+0x9e/0x140  process_one_work+0x98a/0x1620  worker_thread+0x665/0x1080  kthread+0x2e4/0x3a0  ret_from_fork+0x1f/0x30  \u003C/TASK>  Allocated by task 7593:  kasan_save_stack+0x1e/0x40  __kasan_kmalloc+0xa9/0xd0  l2cap_chan_create+0x40/0x930  amp_mgr_create+0x96/0x990  a2mp_channel_create+0x7d/0x150  l2cap_recv_frame+0x51b8/0x9a70  l2cap_recv_acldata+0xaa3/0xc00  hci_rx_work+0x702/0x1220  process_one_work+0x98a/0x1620  worker_thread+0x665/0x1080  kthread+0x2e4/0x3a0  ret_from_fork+0x1f/0x30  Freed by task 7593:  kasan_save_stack+0x1e/0x40  kasan_set_track+0x21/0x30  kasan_set_free_info+0x20/0x30  ____kasan_slab_free+0x167/0x1c0  slab_free_freelist_hook+0x89/0x1c0  kfree+0xe2/0x580  l2cap_chan_put+0x22a/0x2d0  l2cap_conn_del+0x3fc/0x7b0  l2cap_disconn_cfm+0x8c/0xc0  hci_conn_hash_flush+0x11f/0x260  hci_dev_close_sync+0x5f5/0x11f0  hci_dev_do_close+0x2d/0x70  hci_error_reset+0x9e/0x140  process_one_work+0x98a/0x1620  worker_thread+0x665/0x1080  kthread+0x2e4/0x3a0  ret_from_fork+0x1f/0x30  Last potentially related work creation:  kasan_save_stack+0x1e/0x40  __kasan_record_aux_stack+0xbe/0xd0  call_rcu+0x99/0x740  netlink_release+0xe6a/0x1cf0  __sock_release+0xcd/0x280  sock_close+0x18/0x20  __fput+0x27c/0xa90  task_work_run+0xdd/0x1a0  exit_to_user_mode_prepare+0x23c/0x250  syscall_exit_to_user_mode+0x19/0x50  do_syscall_64+0x42/0x80  entry_SYSCALL_64_after_hwframe+0x63/0xcd  Second to last potentially related work creation:  kasan_save_stack+0x1e/0x40  __kasan_record_aux_stack+0xbe/0xd0  call_rcu+0x99/0x740  netlink_release+0xe6a/0x1cf0  __sock_release+0xcd/0x280  sock_close+0x18/0x20  __fput+0x27c/0xa90  task_work_run+0xdd/0x1a0  exit_to_user_mode_prepare+0x23c/0x250  syscall_exit_to_user_mode+0x19/0x50  do_syscall_64+0x42/0x80  entry_SYSCALL_64_after_hwframe+0x63/0xcd",null,[],[],[],[14],{"_key":15},"CVE-2022-49909",[],[],[],"2025-05-01T15:16:16.030Z","2025-11-20T10:16:21.951882Z",{"cisa_kev":22,"cisa_ransomware":22,"cisa_vendor":9,"epss_severity":9,"epss_score":9,"severity":9,"severity_score":9,"severity_version":9,"severity_source":9,"severity_vector":9,"severity_status":9},false,[24],{"url":25,"sources":26,"tags":28},"https://security-tracker.debian.org/tracker/CVE-2022-49909",[27],"osv_debian",[29],"Advisory",[],[],[33],{"source":27,"cvss_v2_0":9,"cvss_v3_0":9,"cvss_v3_1":34,"cvss_v4_0":9},{"baseScore":35,"baseSeverity":9,"vectorString":36,"impactScore":37,"exploitabilityScore":38},7.8,"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",9.8,4.6,[40],{"ecosystem":41,"name":42,"vendor":43,"product":42,"cpe_part":9,"purl_type":44,"purl_namespace":43,"purl_name":42,"source":9,"versions":45},"Debian","linux","debian","deb",[46,52,55,56],{"version":47,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":50,"version_end_type":51,"fixed_in":9},"lt5_10_158_1",true,"ecosystem","5.10.158-1","excluding",{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":51,"fixed_in":9},"lt6_0_8_1","6.0.8-1",{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":51,"fixed_in":9},{"version":53,"is_range":48,"range_type":49,"version_start":9,"version_start_type":9,"version_end":54,"version_end_type":51,"fixed_in":9}]