CVE-2024-50148 Bluetooth: bnep: fix wild-memory-access in proto_unregister
A use-after-free vulnerability in the Linux kernel Bluetooth BNEP module allows local attackers to cause a system crash via wild memory access during module removal.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2024-50148?
CVE-2024-50148 is a medium-severity use after free vulnerability in Linux kernel, published on 7 Nov 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: bnep: fix wild-memory-access in proto_unregister
There's issue as follows: KASAN: maybe wild-memory-access in range [0xdead...108-0xdead...10f] CPU: 3 UID: 0 PID: 2805 Comm: rmmod Tainted: G W RIP: 0010:proto_unregister+0xee/0x400 Call Trace: <TASK> __do_sys_delete_module+0x318/0x580 do_syscall_64+0xc1/0x1d0 entry_SYSCALL_64_after_hwframe+0x77/0x7f
As bnep_init() ignore bnep_sock_init()'s return value, and bnep_sock_init() will cleanup all resource. Then when remove bnep module will call bnep_sock_cleanup() to cleanup sock's resource. To solve above issue just return bnep_sock_init()'s return value in bnep_exit().
Which versions are affected by CVE-2024-50148?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-50148?
Apply the vendor's patch.
Upgrade to the fixed version. These bugs are found with fuzzing and sanitisers and avoided by memory-safe languages. More about Use after free.
Is CVE-2024-50148 being exploited?
There is no known exploitation of CVE-2024-50148 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as AZL-53271, AZL-53316, BELL-CVE-2024-50148, DEBIAN-CVE-2024-50148, GHSA-998p-xc25-r3jq, UBUNTU-CVE-2024-50148.