CVE-2026-80802 nfc: fdp: bound the device-reported read length and fix an skb leak
A malicious NFC controller can trigger a stack buffer overflow in the Linux kernel, potentially allowing code execution or system crashes.
- 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-2026-80802?
CVE-2026-80802 is a memory corruption vulnerability in Linux, published on 4 Sep 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:
nfc: fdp: bound the device-reported read length and fix an skb leak
fdp_nci_i2c_read() takes the next packet length from two device-supplied bytes and never validates it. The value is a u16 used as the i2c_master_recv() count into a 261-byte on-stack buffer: a malicious, counterfeit or malfunctioning controller (or an i2c bus interposer) can drive it far past the buffer for a stack out-of-bounds write that clobbers the canary and return address, or below the minimum frame size (directly, or by truncating the computed sum) so the header/LRC strip and the next length read run past a short receive. Reject a length outside [FDP_NCI_I2C_MIN_PAYLOAD, FDP_NCI_I2C_MAX_PAYLOAD], as a corrupted packet already is, and force resynchronization.
The same loop allocates one data skb per iteration and assumes a length packet followed by a data packet; a device that sends two data packets in one call leaks the first skb when the second allocation overwrites it. Free a previously allocated skb before allocating the next.
Which versions are affected by CVE-2026-80802?
How do I fix CVE-2026-80802?
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-2026-80802 being exploited?
There is no known exploitation of CVE-2026-80802 in the wild and no public exploit code.
Sources
Also known as AZL-99467, BELL-CVE-2026-80802, DEBIAN-CVE-2026-80802, GHSA-6fmj-x4q6-pp6w, UBUNTU-CVE-2026-80802.