---
id: CVE-2026-90221
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing

  nci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse
  the CORE_INIT_RSP packet witho…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing

  nci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse
  the CORE_INIT_RSP packet witho…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    baed3fdf6ed2195c56f25ae18a086b938dcd3983
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    2f434478771a4ebdd535033561c0590bcde39753
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    4f0483bbcdaccc9d4aee30df7351863334cecfa7
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    7d44b897bff84edcd4814899314d661ad4956a8e
  - >-
    Linux >= bcd684aace34fedbd473fbd9b21ed06b0c2d2212 <
    d56575a2595ee1f597f39e8a1cfb67ed3501678d
  - Linux 5.11
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:17.550'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90221'
references:
  - url: 'https://git.kernel.org/stable/c/2f434478771a4ebdd535033561c0590bcde39753'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4f0483bbcdaccc9d4aee30df7351863334cecfa7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5487f04c1ccbfa15aa6e531eb1ec9c9ec9c7bf31'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7d44b897bff84edcd4814899314d661ad4956a8e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/baed3fdf6ed2195c56f25ae18a086b938dcd3983'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bbe68e8249e2c76d65adfd9224fa95f1ca0fbe4e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d56575a2595ee1f597f39e8a1cfb67ed3501678d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.855Z'
epss: 0.00215
epssPercentile: 0.10509
---

## Overview

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

nfc: nci: fix use of uninitialized memory in CORE_INIT_RSP parsing

nci_core_init_rsp_packet_v1() and nci_core_init_rsp_packet_v2() parse
the CORE_INIT_RSP packet without validating that the skb contains
enough data. A malformed response (e.g. injected via virtual_ncidev)
can declare a large num_supported_rf_interfaces while providing
insufficient data, causing reads of uninitialized slab memory. This
is later used in nci_init_complete_req(), triggering a KMSAN
uninit-value warning.

Add skb length checks before accessing packet fields:
- Validate the skb has at least 1 byte for the status field.
- Validate the skb can hold the fixed-size header before parsing.
- In v2, bounds-check each variable-length rf_interface entry and its
  extension parameters within the parsing loop.
- In v1, verify the skb is large enough for both the variable-length
  rf_interfaces array and the trailing rsp_2 structure.

## Remediation

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