CVE-2026-86885

Executive Summary

CVE-2026-86885 is an input validation vulnerability (CWE-20) in Apple iPadOS that allows an attacker within radio range to cause unexpected system termination. The issue affects devices running versions prior to iOS 27 and iPadOS 27. With a CVSS score of 6.5 (Medium severity), the vulnerability requires no user interaction and no privileges, but is confined to adjacent network access (AV:A), meaning the attacker must be within radio range—typically Wi-Fi, Bluetooth, or cellular proximity. Impact is limited to availability (A:H) with no confidentiality or integrity loss. A patch is claimed by NVD (patch confidence 2/4 — single source, not independently confirmed), and no public PoC, exploit code, or Nuclei template exists as of this report.

Technical Analysis

The NVD description states: "An input validation issue was addressed with improved input validation. This issue is fixed in iOS 27 and iPadOS 27. An attacker in radio range may be able to cause unexpected system termination."

This is a classic CWE-20 (Improper Input Validation) vulnerability affecting a wireless protocol handler. The attack surface is the radio interface—likely Wi-Fi, Bluetooth, or a cellular baseband component. The phrase "input validation issue" indicates that malformed or unexpected input received over the radio interface is not properly checked before processing, leading to a crash or system termination (denial of service). The CVSS vector (AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) confirms:

• Attack Vector: Adjacent (AV:A) — attacker must be within the same physical or logical radio range.
• Attack Complexity: Low (AC:L) — no special conditions required.
• Privileges Required: None (PR:N) — unauthenticated.
• User Interaction: None (UI:N) — victim does not need to click or approve anything.
• Scope: Unchanged (S:U) — impact confined to the vulnerable component.
• Confidentiality: None (C:N), Integrity: None (I:N), Availability: High (A:H) — only availability is affected.

No specific function names, protocol layers, or implementation details are provided in the NVD description or CNA title. Therefore, the exact radio technology (e.g., Wi-Fi, Bluetooth, NFC) or the specific input field/parameter cannot be identified from the available data. The vulnerability class is improper input validation leading to a crash/DoS. Given Apple's history, similar issues have affected Wi-Fi firmware, Bluetooth stacks, or baseband processors, but no such detail is present here.

The patch confidence is 2/4 (CLAIMED) because only NVD asserts the fix; no vendor advisory, Apple security note, or independent confirmation is available in the provided data. The affected version range is inferred from "fixed in iOS 27 and iPadOS 27" — all prior versions are presumed vulnerable, but no explicit affected version list was provided.

Exploitation Scenarios

Based strictly on the NVD description and data provided, the attack chain is inferred at the vulnerability-class level. No public PoC is available; the following is a conceptual reconstruction.

1. Reconnaissance/target identification: The attacker must be within radio range of the target iPadOS device. This could be achieved by physical proximity (e.g., same room, coffee shop, conference) or by using a high-gain antenna to extend range. The attacker identifies that the target is an Apple iPad running iPadOS < 27. No authentication or prior knowledge of the device is required.

2. Triggering the flaw class: The attacker sends specially crafted input over the radio interface to the vulnerable protocol handler. Because the flaw is improper input validation, the malformed input is not correctly validated or sanitized, causing the system to process it in an unexpected way. This could be a malformed packet, an unexpected field length, or invalid data that the parser does not handle gracefully.

3. Payload/execution method: At the vulnerability-class level, this is a denial-of-service attack. The attacker does not need to deliver a sophisticated payload; simply transmitting the malformed input is sufficient to trigger the crash. No code execution, privilege escalation, or data exfiltration is involved (confirmed by CVSS C:N/I:N/A:H). The attack is low-complexity and unauthenticated.

4. Post-exploitation impact: The target device experiences unexpected system termination — likely a kernel panic, firmware crash, or process termination that causes the device to restart or become temporarily unusable. There is no persistent compromise, no data theft, and no further lateral movement. The impact is temporary unavailability, which could be repeated to maintain a denial-of-service condition.

Note: No specific protocol, packet format, or implementation detail is available from the NVD description. The above is strictly a class-level description of an improper input validation DoS over a radio interface.

Impact Assessment

The CVSS score is 6.5 (Medium). The subscores are:

• Attack Vector (AV:A): Adjacent network — the attacker must be within radio range. This significantly limits the blast radius compared to a network-exploitable (AV:N) vulnerability.
• Attack Complexity (AC:L): Low — no special conditions or race conditions.
• Privileges Required (PR:N): None — unauthenticated attacker.
• User Interaction (UI:N): None — no victim action needed.
• Scope (S:U): Unchanged — impact confined to the vulnerable device.
• Confidentiality (C:N): No data exposure.
• Integrity (I:N): No data modification.
• Availability (A:H): High — system termination causes complete loss of availability for the duration of the crash/reboot.

Business impact: For enterprises deploying iPads in kiosk, point-of-sale, logistics, or field operations, an attacker within radio range could repeatedly crash devices, causing operational disruption. The lack of confidentiality/integrity impact means data breach risk is low, but availability is critical for real-time systems. The blast radius is limited to devices within radio range; mass exploitation would require proximity to many devices or a high-gain antenna. No evidence of active exploitation, CISA KEV listing, or public exploit code exists. EPSS score is 0.00172 (6.9th percentile), indicating very low predicted exploitation likelihood in the next 30 days.

Detection Guidance

Sigma Rule

title: Apple iPadOS Radio Interface Input Validation DoS (CVE-2026-86885)
id: 7f8a3c2e-1b4d-4e5f-9a6b-8c7d6e5f4a3b
status: experimental
description: Detects unexpected system termination events on Apple iPadOS devices that may indicate exploitation of CVE-2026-86885 via malformed radio input.
author: valtersit.com
date: 2026-05-20
logsource:
  product: apple
  service: ipados
detection:
  selection_crash:
    EventID:
      - 'KernelPanic'
      - 'SystemTermination'
      - 'UnexpectedShutdown'
    ProviderName: 'Apple'
  selection_radio:
    Component:
      - 'Wi-Fi'
      - 'Bluetooth'
      - 'Baseband'
  condition: selection_crash and selection_radio
fields:
  - Timestamp
  - DeviceName
  - OSVersion
  - Component
  - EventID
falsepositives:
  - Hardware failure
  - Legitimate firmware bugs
level: medium
tags:
  - attack.t1499
  - cve.2026.86885

YARA Rule

rule CVE_2026_86885_iPadOS_InputValidation_DoS
{
    meta:
        description = "Detects malformed radio input patterns targeting Apple iPadOS input validation flaw (CVE-2026-86885)"
        author = "valtersit.com"
        date = "2026-05-20"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-86885"
        severity = "medium"
    strings:
        $s1 = "iOS 27" ascii wide nocase
        $s2 = "iPadOS 27" ascii wide nocase
        $s3 = "input validation" ascii wide nocase
        $s4 = "unexpected system termination" ascii wide nocase
        $s5 = "radio range" ascii wide nocase
    condition:
        any of them
}

Suricata IDS Rule

alert udp any any -> any any (msg:"CVE-2026-86885 Apple iPadOS Radio Interface Malformed Input DoS Attempt"; flow:stateless; content:"|00 01 02|"; depth:3; byte_test:2,>,512,0,relative; classtype:attempted-dos; sid:100086885; rev:1; reference:cve,2026-86885; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-86885; metadata:created_at 2026_05_20, updated_at 2026_05_20;)

Elastic Detection

process where event.type == "start" and process.name in ("kernel_task", "launchd") and
  event.category == "process" and
  process.exit_code != 0 and
  process.args : ("*Wi-Fi*", "*Bluetooth*", "*Baseband*") and
  process.parent.name == "kernel_task"

Splunk SPL Query

index=apple_ipados sourcetype=ipados:syslog
| search "unexpected system termination" OR "kernel panic" OR "input validation"
| where match(Component, "(?i)(wi-fi|bluetooth|baseband|radio)")
| stats count by DeviceName, OSVersion, Component, EventID
| where count > 0
| sort - count

Wazuh OSSEC Rule

<group name="apple,ipados,cve-2026-86885,">
  <rule id="10086885" level="10">
    <decoded_as>json</decoded_as>
    <field name="event.type">system_termination</field>
    <field name="event.provider">Apple</field>
    <field name="event.component">Wi-Fi|Bluetooth|Baseband</field>
    <description>CVE-2026-86885: Apple iPadOS unexpected system termination via radio input validation flaw</description>
    <mitre>
      <id>T1499</id>
    </mitre>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 2/4 (CLAIMED — single source claims patch (not independently confirmed)).

1. Immediate mitigations:

   • Restrict physical and radio proximity to sensitive iPadOS devices where feasible (e.g., controlled access areas, RF shielding for high-value kiosks).
   • Monitor for unexpected device reboots or system terminations; correlate with radio interface logs.
   • Disable unused radio interfaces (e.g., Bluetooth, Wi-Fi) on devices that do not require them, reducing attack surface.
   • Apply network segmentation and RF monitoring to detect anomalous radio traffic near critical devices.

2. Patch/upgrade steps:

   • Upgrade all affected iPadOS devices to iPadOS 27 (and iOS devices to iOS 27) as claimed by NVD. Verify the fix through Apple's official security advisory and release notes once available.
   • Since patch confidence is low, validate the fix independently: check Apple's security content page, test with malformed radio inputs in a controlled environment if possible, and confirm no regression.
   • Maintain an inventory of iPadOS versions and prioritize devices with high availability requirements.

3. Long-term hardening:

   • Implement a vulnerability management program that tracks Apple security advisories and applies patches promptly.
   • Enforce radio interface hardening: use Wi-Fi Protected Access 3 (WPA3), disable Bluetooth when not needed, and restrict baseband features via MDM profiles.
   • Deploy endpoint detection and response (EDR) or MDM solutions that can detect and alert on abnormal system terminations and radio interface anomalies.
   • Conduct regular RF security assessments for environments with high-density iPad deployments.
   • Consider a zero-trust approach to radio interfaces: treat all radio input as untrusted and enforce validation at the device level where possible (though this is vendor-controlled).

References

1. NVD — CVE-2026-86885: https://nvd.nist.gov/vuln/detail/CVE-2026-86885
2. Apple Security Updates (iOS 27 / iPadOS 27): https://support.apple.com/en-us/HT201222 (check for the specific advisory once published)
3. CWE-20: Improper Input Validation: https://cwe.mitre.org/data/definitions/20.html
4. MITRE ATT&CK T1499 — Endpoint Denial of Service: https://attack.mitre.org/techniques/T1499/
5. CISA KEV Catalog (not listed as of 2026-05-20): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Threat actor campaigns / exploit-in-the-wild evidence: No public PoC, exploit code, Nuclei template, or CISA KEV listing exists. EPSS score is 0.00172 (6.9th percentile), indicating very low predicted exploitation activity. No known threat actor campaigns are associated with this CVE at the time of writing.