CVE-2026-80803 nfc: digital: clamp SENSF_RES length to the destination buffer
A malicious NFC-F device can trigger a stack buffer overflow in the Linux kernel NFC driver, potentially leading to code execution or system crash.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2026-80803?
CVE-2026-80803 is a memory corruption vulnerability in Linux, published on 4 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
In the Linux kernel, the following vulnerability has been resolved:
nfc: digital: clamp SENSF_RES length to the destination buffer
digital_in_recv_sensf_res() memcpy()s resp->len bytes from a remote NFC-F device response into the NFC_SENSF_RES_MAXSIZE-byte target.sensf_res field without an upper-bound check. A nearby malicious NFC-F device can send an oversized SENSF_RES response to overflow the stack-local struct nfc_target.
Clamp resp->len to NFC_SENSF_RES_MAXSIZE before the copy.
Found by 0sec automated security-research tooling (https://0sec.ai).
Which versions are affected by CVE-2026-80803?
How do I fix CVE-2026-80803?
Apply the vendor's patch.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-80803 being exploited?
There is no known exploitation of CVE-2026-80803 in the wild and no public exploit code.
Sources
Also known as AZL-99399, BELL-CVE-2026-80803, DEBIAN-CVE-2026-80803, GHSA-p57f-2f7j-w542, UBUNTU-CVE-2026-80803.