---
id: CVE-2026-80794
title: 'nfc: nci: fix uninit-value in the RF discover/activated NTF handlers'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: nci: fix uninit-value in the RF discover/activated NTF handlers

  nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each
  parse a notification into…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    1007a6b429d756513abd25bd00290908f2e89a4a
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    4bda9ef8392710f21e99027467f3f4afdfb5c99a
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    fe69fed3495f676578d49414a069ad7d8468e2ce
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    7489f59d1ea2d3298aa41de7baf193e5e6e132f6
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    7086dab72b3ed95df96842801e10e935cfeb27a3
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    0d4b5cfab6891a5ca0f6aef209beebba4bd7c095
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    5bd00c0e1470d90d77a7c60242854257ddf14e00
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    d6f743d3d388913135681cde051c08823730194f
  - >-
    Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 <
    8cbe06c1e699c0a165dae5093a2550e65f914818
  - Linux 3.3
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:47.481Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80794'
references:
  - url: 'https://git.kernel.org/stable/c/1007a6b429d756513abd25bd00290908f2e89a4a'
  - url: 'https://git.kernel.org/stable/c/4bda9ef8392710f21e99027467f3f4afdfb5c99a'
  - url: 'https://git.kernel.org/stable/c/fe69fed3495f676578d49414a069ad7d8468e2ce'
  - url: 'https://git.kernel.org/stable/c/7489f59d1ea2d3298aa41de7baf193e5e6e132f6'
  - url: 'https://git.kernel.org/stable/c/7086dab72b3ed95df96842801e10e935cfeb27a3'
  - url: 'https://git.kernel.org/stable/c/0d4b5cfab6891a5ca0f6aef209beebba4bd7c095'
  - url: 'https://git.kernel.org/stable/c/5bd00c0e1470d90d77a7c60242854257ddf14e00'
  - url: 'https://git.kernel.org/stable/c/d6f743d3d388913135681cde051c08823730194f'
  - url: 'https://git.kernel.org/stable/c/8cbe06c1e699c0a165dae5093a2550e65f914818'
tags:
  - cve.org
epss: 0.00243
epssPercentile: 0.14379
ingestedAt: '2026-10-19T09:16:01.529Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

nfc: nci: fix uninit-value in the RF discover/activated NTF handlers

nci_rf_discover_ntf_packet() and nci_rf_intf_activated_ntf_packet() each
parse a notification into an on-stack struct (nci_rf_discover_ntf /
nci_rf_intf_activated_ntf) that is not initialised. The RF
technology-specific parameters are only extracted when
rf_tech_specific_params_len is non-zero, so a notification that reports a
zero length leaves the rf_tech_specific_params union uninitialised - and
both handlers then pass it to nci_add_new_protocol(), which reads it:

 - discover:  nci_add_new_target() -> nci_add_new_protocol();
 - activated: nci_target_auto_activated() -> nci_add_new_protocol().

nci_add_new_protocol() uses nfca_poll->nfcid1_len as both a branch
condition and a memcpy() length and copies nfcid1/sens_res/sel_res into
ndev->targets, which is later exposed to user space via NFC_CMD_GET_TARGET.

  BUG: KMSAN: uninit-value in nci_add_new_protocol+0x624/0x6c0
   nci_add_new_protocol+0x624/0x6c0
   nci_ntf_packet+0x25b2/0x3c30
   nci_rx_work+0x318/0x5d0
   process_scheduled_works+0x84b/0x17a0
   worker_thread+0xc10/0x11b0
   kthread+0x376/0x500
  Local variable ntf.i created at:
   nci_ntf_packet+0xbc2/0x3c30

Zero-initialise both on-stack notifications so the union reads back as
zero when no technology-specific parameters are present.

## Affected

- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 1007a6b429d756513abd25bd00290908f2e89a4a`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 4bda9ef8392710f21e99027467f3f4afdfb5c99a`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < fe69fed3495f676578d49414a069ad7d8468e2ce`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7489f59d1ea2d3298aa41de7baf193e5e6e132f6`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 7086dab72b3ed95df96842801e10e935cfeb27a3`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 0d4b5cfab6891a5ca0f6aef209beebba4bd7c095`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 5bd00c0e1470d90d77a7c60242854257ddf14e00`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < d6f743d3d388913135681cde051c08823730194f`
- `Linux >= e8c0dacd9836dc2dcb28d236c9cc3cfaa9965a20 < 8cbe06c1e699c0a165dae5093a2550e65f914818`
- `Linux 3.3`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.