CVE-2022-49909
- Source
- https://cve.org/CVERecord?id=CVE-2022-49909
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2022-49909.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2022-49909
- Downstream
- Related
- Published
- 2025-05-01T14:10:52Z
- Modified
- 2026-05-18T05:56:59Z
- Severity
-
- 7.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
- Summary
- Bluetooth: L2CAP: fix use-after-free in l2cap_conn_del()
- Details
-
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: 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
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
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49909.json" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0d0e2d032811280b927650ff3c15fe5020e82533
- https://git.kernel.org/stable/c/17c6164854f8bb80bf76f32b2c2f199c16b53703
- https://git.kernel.org/stable/c/7f7bfdd9a9af3b12c33d9da9a012e7f4d5c91f4b
- https://git.kernel.org/stable/c/8f7e4cf0694149a5d999d676ebd9ecf1b4cb2cc9
- https://git.kernel.org/stable/c/a3a7b2ac64de232edb67279e804932cb42f0b52a
- https://git.kernel.org/stable/c/c1f594dddd9ffd747c39f49cc5b67a9b7677d2ab
- https://git.kernel.org/stable/c/d9ec6e2fbd4a565b2345d4852f586b7ae3ab41fd
- https://git.kernel.org/stable/c/db4a0783ed78beb2ebaa32f5f785bfd79c580689
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49909.json
- https://nvd.nist.gov/vuln/detail/CVE-2022-49909
Affected packages
Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Affected ranges
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd255c861e268ba342e855244639a15f12d7a0bf2Fixeddb4a0783ed78beb2ebaa32f5f785bfd79c580689
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced5bb395334392891dffae5a0e8f37dbe1d70496c9Fixed17c6164854f8bb80bf76f32b2c2f199c16b53703
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedbbd1fdb0e1adf827997a93bf108f20ede038e56eFixed7f7bfdd9a9af3b12c33d9da9a012e7f4d5c91f4b
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced098e07ef0059296e710a801cdbd74b59016e6624Fixedc1f594dddd9ffd747c39f49cc5b67a9b7677d2ab
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedde5d4654ac6c22b1be756fdf7db18471e7df01eaFixedd9ec6e2fbd4a565b2345d4852f586b7ae3ab41fd
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedf32d5615a78a1256c4f557ccc6543866e75d03f4Fixeda3a7b2ac64de232edb67279e804932cb42f0b52a
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introducedd0be8347c623e0ac4202a1d4e0373882821f56b0Fixed8f7e4cf0694149a5d999d676ebd9ecf1b4cb2cc9Fixed0d0e2d032811280b927650ff3c15fe5020e82533
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedLast Affected59a55ec33a54a7179fa178f8aaf8b1cb8e63bd93
Affected versions
v2.*
v3.*
v4.*
v5.*
Linux / Kernel
Package
- Name
- Kernel
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0 Unknown introduced version / All previous versions are affectedFixed4.9.333
- Type
- ECOSYSTEM
- Events
-
Introduced4.10.0Fixed4.14.299
- Type
- ECOSYSTEM
- Events
-
Introduced4.15.0Fixed4.19.265
- Type
- ECOSYSTEM
- Events
-
Introduced4.20.0Fixed5.4.224
- Type
- ECOSYSTEM
- Events
-
Introduced5.5.0Fixed5.10.154
- Type
- ECOSYSTEM
- Events
-
Introduced5.11.0Fixed5.15.78
- Type
- ECOSYSTEM
- Events
-
Introduced5.16.0Fixed6.0.8