CVE-2022-49909 Vulnerability Analysis & Exploit Details

CVE-2022-49909
Vulnerability Scoring

7.8

/10

Very High Risk

Highly exploitable, CVE-2022-49909 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Local
Vulnerability requires local system access.
Privileges Required: Low
Some privileges are necessary to exploit the vulnerability.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2022-49909 Details

Status: Analyzed

Last updated: 🕜 07 May 2025, 13:30 UTC
Originally published on: 🕒 01 May 2025, 15:16 UTC

Time between publication and last update: 5 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVE-2022-49909 Vulnerability Summary

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: <TASK> 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 </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

Assessing the Risk of CVE-2022-49909

Access Complexity Graph

The exploitability of CVE-2022-49909 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2022-49909

CVE-2022-49909 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2022-49909, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2022-49909, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: High
Exploiting CVE-2022-49909 can result in unauthorized access to sensitive data, severely compromising data privacy.
Integrity: High
CVE-2022-49909 could allow unauthorized modifications to data, potentially affecting system reliability and trust.
Availability: High
CVE-2022-49909 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2022-49909 References

External References

CWE Common Weakness Enumeration

CWE-416

Vulnerable Configurations

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cpe:2.3:o:linux:linux_kernel:5.19.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.12:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.13:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.14:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.15:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.16:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19.17:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:5.19:rc8:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.1:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.2:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.0.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.1:rc3:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2022-49909: Combat Critical CVE Threats

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