CVE-2026-64549 Bluetooth: bpa10x: avoid OOB read of revision string in bpa10x_setup()
A malicious Bluetooth device can trigger an out-of-bounds read in the Linux kernel, leaking adjacent memory contents into logs and debugfs.
- 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-2026-64549?
CVE-2026-64549 is a vulnerability in Linux, published on 27 Jul 2026. 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: bpa10x: avoid OOB read of revision string in bpa10x_setup()
bpa10x_setup() sends the vendor command 0xfc0e and passes the response to bt_dev_info() and hci_set_fw_info() as a "%s" string starting at skb->data + 1, without checking the length:
bt_dev_info(hdev, "%s", (char *)(skb->data + 1)); hci_set_fw_info(hdev, "%s", skb->data + 1);
A device that returns a one-byte response (status only) leaves skb->data + 1 past the end of the data, and the %s walk reads adjacent slab memory until it meets a NUL. The same happens when the payload is not NUL-terminated within skb->len. The out-of-bounds bytes end up in the kernel log and the firmware-info debugfs file.
Print the revision string with a bounded "%.*s" limited to skb->len - 1 instead. This keeps the string readable for well-behaved devices while never reading past the received data, and does not fail setup, so a device returning a short or unterminated response keeps working.
Which versions are affected by CVE-2026-64549?
How do I fix CVE-2026-64549?
Apply the vendor's patch.
Is CVE-2026-64549 being exploited?
There is no known exploitation of CVE-2026-64549 in the wild and no public exploit code.
Sources
Also known as AZL-94074, BELL-CVE-2026-64549, DEBIAN-CVE-2026-64549, GHSA-4pq4-7m8r-frpc, UBUNTU-CVE-2026-64549.