---
id: CVE-2026-90226
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: llcp: avoid userspace overflow on invalid optlen

  nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so
  the kernel always stores 4 bytes regardle…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  nfc: llcp: avoid userspace overflow on invalid optlen

  nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so
  the kernel always stores 4 bytes regardle…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    42859562b7cc4313a84a584f338118edb7087066
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    598dcd53c52f8eeb9dd5382198c03960d5d40fcd
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    7e40f2f5e7bc06c3ddef781180ce4f7994176547
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    35573c6cb081af2f4a7caeea291302aca5484526
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    b4c5abaea06292e1dddb70eac1b51589b32c77a3
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    bd6f1277b62bc1df348ca21739df2bc546fcd493
  - >-
    Linux >= 26fd76cab2e61cedc5c25f7151fb31b57ddc53c7 <
    99985bfa8336fadcc69190ba2dcbd5386af3d661
  - Linux 3.10
published: '2026-09-17'
updated: '2026-09-17'
sourceUpdated: '2026-09-17T17:17:18.270'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-90226'
references:
  - url: 'https://git.kernel.org/stable/c/35573c6cb081af2f4a7caeea291302aca5484526'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/42859562b7cc4313a84a584f338118edb7087066'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/598dcd53c52f8eeb9dd5382198c03960d5d40fcd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/7e40f2f5e7bc06c3ddef781180ce4f7994176547'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8bf228fa02b1ed8ce622fb81fa8edc42be9aeb67'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/99985bfa8336fadcc69190ba2dcbd5386af3d661'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b4c5abaea06292e1dddb70eac1b51589b32c77a3'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bd6f1277b62bc1df348ca21739df2bc546fcd493'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
ingestedAt: '2026-09-17T16:21:47.853Z'
epss: 0.0021
epssPercentile: 0.10068
---

## Overview

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

nfc: llcp: avoid userspace overflow on invalid optlen

nfc_llcp_getsockopt() casts optval to (u32 __user *) for put_user(), so
the kernel always stores 4 bytes regardless of the caller-supplied
optlen. The existing min_t(u32, len, sizeof(u32)) only clamps the length
reported back to userspace; it does not constrain the store. A call with
optlen < 4 therefore writes past the user buffer, violating the
getsockopt(2) contract for all five supported optnames.

Reject any call with optlen < sizeof(u32) up front. 'len' is int, so a
plain size comparison would promote a negative optlen to size_t and slip
past the check; an explicit 'len < 0' test is added first to catch
negative values before the size compare.

## Remediation

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