CVE-2026-80802: Linux Vulnerability

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.

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

Vendor	Product	Versions
Linux	Linux	>= a06347c04c13e380afce0c9816df51f00b83faf1, < d9498ab9a78cb63d78dbe4f221d8cc6c91f285ee; >= a06347c04c13e380afce0c9816df51f00b83faf1, < 1fc32327b927a6e2cde086f82575c29880844228; >= a06347c04c13e380afce0c9816df51f00b83faf1, < 8d2c243b79854628ff076c38748c020042f02f57; >= a06347c04c13e380afce0c9816df51f00b83faf1, < fc3c2bd5b1ec6c7cbc8a50e32d9bcec114f25463; >= a06347c04c13e380afce0c9816df51f00b83faf1, < 0d723090645b82c1cb27cfd7ebf81f0e7c96bcae; >= a06347c04c13e380afce0c9816df51f00b83faf1, < db7e464b350969c6ea8340de00d9796e5fd5123b; >= a06347c04c13e380afce0c9816df51f00b83faf1, < e5eec121f2c3bc4c7022613bedd9121a8aa4c949; >= a06347c04c13e380afce0c9816df51f00b83faf1, < 1aa3fc769b0c45bd19f8dab1697084c2b3f6d706; >= a06347c04c13e380afce0c9816df51f00b83faf1, < 7ad21dcfeb5181af0c3ee2608808c0c0a5283aa1
Linux	Linux	4.4

References

Timeline

Published: Sep 4, 2026
Last Modified: Sep 4, 2026
Status: Received

Frequently Asked Questions

What is CVE-2026-80802?

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.

How severe is CVE-2026-80802?

Severity scoring for CVE-2026-80802 is pending analysis.

How do I fix CVE-2026-80802?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

How Strix Helps

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