CVE-2024-36012 Bluetooth: msft: fix slab-use-after-free in msft_do_close()
A use-after-free in the Linux kernel Bluetooth subsystem allows attackers to cause denial of service or potentially execute code.
- 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-2024-36012?
CVE-2024-36012 is a high-severity use after free vulnerability in Linux kernel, published on 23 May 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: msft: fix slab-use-after-free in msft_do_close()
Tying the msft->data lifetime to hdev by freeing it in hci_release_dev() to fix the following case:
[use] msft_do_close() msft = hdev->msft_data; if (!msft) ...(1) <- passed. return; mutex_lock(&msft->filter_lock); ...(4) <- used after freed.
[free] msft_unregister() msft = hdev->msft_data; hdev->msft_data = NULL; ...(2) kfree(msft); ...(3) <- msft is freed.
================================================================== BUG: KASAN: slab-use-after-free in __mutex_lock_common kernel/locking/mutex.c:587 [inline] BUG: KASAN: slab-use-after-free in __mutex_lock+0x8f/0xc30 kernel/locking/mutex.c:752 Read of size 8 at addr ffff888106cbbca8 by task kworker/u5:2/309
Weakness: CWE-416
Which versions are affected by CVE-2024-36012?
It affects 1 product.
Products include Linux kernel.
How do I fix CVE-2024-36012?
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-2024-36012 being exploited?
There is no known exploitation of CVE-2024-36012 in the wild and no public exploit code.
Other vulnerabilities in Linux kernel
Sources
Also known as BELL-CVE-2024-36012, DEBIAN-CVE-2024-36012, GHSA-qm69-cr5h-7x64, ROOT-OS-UBUNTU-2204-CVE-2024-36012, UBUNTU-CVE-2024-36012.