---
id: CVE-2026-80795
title: 'nfc: nci: fix out-of-bounds write in nci_target_auto_activated()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: nci: fix out-of-bounds write in nci_target_auto_activated()

  nci_target_auto_activated() appends a target to the fixed-size array
  ndev->targets[NCI_MAX_DISCOVERED_…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    0dc59de0075f88404a0f4a2b5233104ef459fbb2
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    94530ffabfca57e9bff1d207106010014cc84032
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    afd8605fb43becb892311102844955c3b127fc7e
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    24761d3a5f692df5f7d848caeabcb2afd10917aa
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    2f08dbce3b37624ec6b424d759336a99586170ec
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    d7083f41c21b30582e91b2e6de4d54dce74f6f9c
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    129032c0616d83a5e3e304f6ebf88f14ba01e5f7
  - >-
    Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 <
    ac200079db50af81e6b04d058b33ec92901d8edd
  - Linux 3.4
published: '2026-09-04'
updated: '2026-10-19'
sourceUpdated: '2026-10-19T08:43:48.491Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-80795'
references:
  - url: 'https://git.kernel.org/stable/c/0dc59de0075f88404a0f4a2b5233104ef459fbb2'
  - url: 'https://git.kernel.org/stable/c/94530ffabfca57e9bff1d207106010014cc84032'
  - url: 'https://git.kernel.org/stable/c/afd8605fb43becb892311102844955c3b127fc7e'
  - url: 'https://git.kernel.org/stable/c/24761d3a5f692df5f7d848caeabcb2afd10917aa'
  - url: 'https://git.kernel.org/stable/c/50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951'
  - url: 'https://git.kernel.org/stable/c/2f08dbce3b37624ec6b424d759336a99586170ec'
  - url: 'https://git.kernel.org/stable/c/d7083f41c21b30582e91b2e6de4d54dce74f6f9c'
  - url: 'https://git.kernel.org/stable/c/129032c0616d83a5e3e304f6ebf88f14ba01e5f7'
  - url: 'https://git.kernel.org/stable/c/ac200079db50af81e6b04d058b33ec92901d8edd'
tags:
  - cve.org
epss: 0.00243
epssPercentile: 0.1438
ingestedAt: '2026-10-19T09:16:01.528Z'
---

## Overview

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

nfc: nci: fix out-of-bounds write in nci_target_auto_activated()

nci_target_auto_activated() appends a target to the fixed-size array
ndev->targets[NCI_MAX_DISCOVERED_TARGETS] and increments ndev->n_targets
without first checking the array is full; unlike its sibling
nci_add_new_target(), which bails out when n_targets already equals
NCI_MAX_DISCOVERED_TARGETS.

ndev->n_targets is only cleared by nci_clear_target_list(), so an NFCC
that repeatedly re-runs discovery (RF_DISCOVER_RSP, which re-enters
NCI_DISCOVERY without clearing the target list) and reports an
auto-activated target (RF_INTF_ACTIVATED_NTF) drives n_targets past the
limit. The append then writes a struct nfc_target past the end of the
array (a slab out-of-bounds write), and nfc_targets_found() goes on to
walk the array with the inflated count:

  BUG: KASAN: slab-out-of-bounds in nci_add_new_protocol+0x94/0x2ac [nci]
  Write of size 2 at addr ffff0000c7299a18 by task kworker/u8:0/12
  Workqueue: nfc0_nci_rx_wq nci_rx_work [nci]
  Call trace:
   nci_add_new_protocol+0x94/0x2ac [nci]
   nci_ntf_packet+0xddc/0x11a0 [nci]
   nci_rx_work+0x15c/0x1e0 [nci]
   process_one_work+0x2dc/0x500
   worker_thread+0x240/0x460
   kthread+0x1c0/0x1d0
   ret_from_fork+0x10/0x20

  The buggy address belongs to the cache kmalloc-2k of size 2048
  The buggy address is located 1024 bytes to the right of
  allocated 1560-byte region [ffff0000c7299000, ffff0000c7299618)

Guard nci_target_auto_activated() with the same check used by
nci_add_new_target().

## Affected

- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 0dc59de0075f88404a0f4a2b5233104ef459fbb2`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 94530ffabfca57e9bff1d207106010014cc84032`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < afd8605fb43becb892311102844955c3b127fc7e`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 24761d3a5f692df5f7d848caeabcb2afd10917aa`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 50e87e1c0e18d791dcd7dccf30f9a2f3e2cf3951`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 2f08dbce3b37624ec6b424d759336a99586170ec`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < d7083f41c21b30582e91b2e6de4d54dce74f6f9c`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < 129032c0616d83a5e3e304f6ebf88f14ba01e5f7`
- `Linux >= 019c4fbaa790e2b3f11dab0c8b7d9896d77db3e5 < ac200079db50af81e6b04d058b33ec92901d8edd`
- `Linux 3.4`

## Remediation

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