CVE-2025-7403 Bluetooth: bt_conn_tx_processor unsafe handling
An attacker can exploit a use-after-free in the Bluetooth connection processor to achieve precise memory corruption and potential code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-7403?
CVE-2025-7403 is a high-severity use after free vulnerability in Zephyrproject Zephyr, published on 19 Sep 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Unsafe handling in bt_conn_tx_processor causes a use-after-free, resulting in a write-before-zero. The written 4 bytes are attacker-controlled, enabling precise memory corruption.
Weakness: CWE-123
Which versions are affected by CVE-2025-7403?
It affects 1 product.
Products include Zephyrproject Zephyr.
How do I fix CVE-2025-7403?
No fix has been published for CVE-2025-7403 yet. Limit exposure of the affected software until one is available.
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-2025-7403 being exploited?
There is no known exploitation of CVE-2025-7403 in the wild and no public exploit code.
Other vulnerabilities in Zephyrproject Zephyr
- CVE-2026-5067 Out-of-bounds read/write in HTTP WebSocket upgrade via non-null-terminated Sec-WebSocket-Key
- CVE-2022-3806 Bluetooth HCI Error Handling Double Free
- CVE-2017-14199 Memory corruption in getaddrinfo
- CVE-2018-1000800 Null dereference in n/a
- CVE-2021-3329 DOS: Incorrect handling of the initial HCI ACL_MTU handshake packet leads to crash of bluetooth host layer
Sources
Also known as GHSA-9r46-cqqw-6j2j.