CVE-2024-41062 bluetooth/l2cap: sync sock recv cb and release
A race condition in the Linux kernel Bluetooth L2CAP subsystem allows a use-after-free, potentially causing a system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-41062?
CVE-2024-41062 is a high-severity vulnerability in Linux kernel, published on 29 Jul 2024. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
In the Linux kernel, the following vulnerability has been resolved:
bluetooth/l2cap: sync sock recv cb and release
The problem occurs between the system call to close the sock and hci_rx_work, where the former releases the sock and the latter accesses it without lock protection.
CPU0 CPU1 ---- ---- sock_close hci_rx_work l2cap_sock_release hci_acldata_packet l2cap_sock_kill l2cap_recv_frame sk_free l2cap_conless_channel l2cap_sock_recv_cb
If hci_rx_work processes the data that needs to be received before the sock is closed, then everything is normal; Otherwise, the work thread may access the released sock when receiving data.
Add a chan mutex in the rx callback of the sock to achieve synchronization between the sock release and recv cb.
Sock is dead, so set chan data to NULL, avoid others use invalid sock pointer.
Which versions are affected by CVE-2024-41062?
It affects 1 product.
Linux distribution packages (4)
kernel-livepatch-SLE15-SP4_Update_24 SUSE:Linux Enterprise Live Patching 15 SP4 | All versions | 15-150400.2.1 |
kernel-livepatch-SLE15-SP4_Update_25 SUSE:Linux Enterprise Live Patching 15 SP4 | All versions | 15-150400.2.1 |
kernel-livepatch-SLE15-SP5_Update_12 SUSE:Linux Enterprise Live Patching 15 SP5 | All versions | 15-150500.2.1 |
kernel-livepatch-SLE15-SP5_Update_13 SUSE:Linux Enterprise Live Patching 15 SP5 | All versions | 13-150500.2.1 |
Products include Linux kernel.
How do I fix CVE-2024-41062?
Apply the vendor's patch.
Is CVE-2024-41062 being exploited?
There is no known exploitation of CVE-2024-41062 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-41062, DEBIAN-CVE-2024-41062, GHSA-f6q4-wr98-4jf5, ROOT-OS-DEBIAN-11-CVE-2024-41062, ROOT-OS-UBUNTU-2204-CVE-2024-41062, SUSE-SU-2025:1104-1 and 2 more.