What’s Vulnerable › Vulnerabilities

CVE-2026-98481: nfc: port100: reject frames whose declared length exceeds the received data

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: nfc: port100: reject frames whose declared length exceeds the received data port100_recv_response() passes the URB transfer buffer to port100_rx_frame_is_valid(), which checksums le16_to_cpu(frame->datalen) bytes of frame->data. datalen is a 16-bit field supplied by the device and is never checked against the number of bytes actually received (urb->actual_length), so a device reporting a datalen larger than the received frame makes port100_data_checksum() read out of bounds past the transfer buffer. Reject a response whose declared frame size does not fit the received length before validating it. Found by 0sec (https://0sec.ai) using automated source analysis; the missing bound is evident from source. Compile-tested.

Affected products

• Linux kernel: 3.13 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/035056e07ea65be670284246d9bc62f2f00ff4a3
• https://git.kernel.org/stable/c/092c6a605cbd6414ef499834c2e0da69c2c3388e
• https://git.kernel.org/stable/c/0d482995f0cdd0302450aa300c684c642d8ab31f
• https://git.kernel.org/stable/c/144ad477c381e2c592b64898d04ab4ce03b32861
• https://git.kernel.org/stable/c/14b1467cfc6630583650f33538174c5a1ec685ab
• https://git.kernel.org/stable/c/9e8df087826b9999d1b83b06f5d85675d5a69c9e
• https://git.kernel.org/stable/c/db66a30588630c7de30ef033f00daddef69f6ad9
• https://git.kernel.org/stable/c/e4da1452e10c6472a4bac48dc2f6a35fff1fcd69

Get alerted when CVE-2026-98481 or the next vulnerability affects your stack