CVE-2026-98482
Received Received - Intake

Buffer Overflow in Linux Kernel NFC LLCP Module

Publication date: 2026-10-18

Last updated on: 2026-10-18

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: nfc: llcp: drop truncated I/RR/RNR PDUs in nfc_llcp_recv_hdlc() nfc_llcp_recv_hdlc() reads the sequence byte skb->data[2], via nfc_llcp_ns()/nfc_llcp_nr(), before any length check. The receive path only guarantees the two-byte LLCP header -- __nfc_llcp_recv() checks it with pskb_may_pull() and nfc_llcp_recv_agf() admits two-byte inner PDUs -- so a two-byte I, RR or RNR PDU reads one byte of uninitialised skb tailroom. The byte becomes N(R)/N(S); a peer can already set those with a well-formed PDU, so this is acting on uninitialised memory, not new peer control. Guard the read with pskb_may_pull(), as commit 95674f506c63 ("nfc: llcp: reject PDUs shorter than the LLCP header") did for the two-byte header, so the sequence byte is present and linear before it is read. RR and RNR PDUs are LLCP_HEADER_SIZE + LLCP_SEQUENCE_SIZE bytes and an I PDU is longer, so no valid frame is rejected; a truncated PDU is malformed, so return without a DM reply.

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Meta Information

Published
2026-10-18
Last Modified
2026-10-18
Generated
2026-10-18
AI Q&A
2026-10-18
EPSS Evaluated
N/A
NVD
CVE-2026-98482
EUVD
EUVD-2026-103722

Affected Vendors & Products

Showing 9 associated CPEs
Vendor Product Version / Range
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux d646960f7986fefb460a2b062d5ccc8ccfeacc3a
Linux Linux 3.3

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability is in the Linux kernel's NFC LLCP (Near Field Communication Logical Link Control Protocol) module. It involves reading a sequence byte from an skb buffer before verifying the buffer has enough data. This can lead to reading uninitialized memory, as the receive path only guarantees a two-byte LLCP header but the code reads a third byte without checking buffer length first.

Detection Guidance

This vulnerability involves uninitialized memory exposure in the Linux kernel's NFC LLCP module. Detection requires checking kernel logs for related errors or monitoring for malformed NFC PDUs. Use commands like 'dmesg | grep llcp' or 'journalctl -k | grep llcp' to inspect kernel logs for LLCP-related issues.

Impact Analysis

An attacker on the same network could exploit this to read uninitialized memory from the kernel, potentially exposing sensitive data. This could lead to information disclosure or other security issues depending on what data is stored in that memory region.

Mitigation Strategies

Apply the kernel patch that adds the pskb_may_pull() guard in nfc_llcp_recv_hdlc(). Update to a fixed kernel version where this issue is resolved. If immediate patching is not possible, disable NFC LLCP functionality temporarily as a workaround.

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