CVE-2026-25263

Executive Summary

CVE-2026-25263 is a memory corruption vulnerability (CWE-787: Out-of-bounds Write) affecting Qualcomm Snapdragon G1 Gen 2 Gaming Platform Firmware. The flaw is triggered when the kernel processes an IOCTL command issued from user space with invalid parameters that are not properly validated, leading to memory corruption. An attacker with local access and the ability to influence user interaction — typically a malicious or compromised application running on the affected device — could exploit this to achieve high integrity impact and potentially escalate privileges within the impacted subsystem.

Technical Analysis

The vulnerability resides in the kernel's IOCTL handling path for the Qualcomm Snapdragon G1 Gen 2 Gaming Platform. IOCTL (Input/Output Control) is a system call interface that allows user-space processes to communicate with kernel drivers, passing commands and associated parameters. When an IOCTL command is issued with parameters that fail to meet the driver's validation requirements, the kernel performs a memory write operation that exceeds the bounds of the intended buffer.

CWE-787 (Out-of-bounds Write) indicates that the corruption occurs when data is written past the end of an allocated memory region. In kernel context, this class of vulnerability is particularly dangerous because successful exploitation can result in corruption of adjacent kernel data structures, potentially leading to privilege escalation, arbitrary code execution in kernel context, or denial of service via system crash (kernel panic).

The CVSS vector CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:L reveals the following characteristics:

• AV:L (Local): The attack vector is local — the attacker must have local access to the device, such as a malicious application installed on the platform.
• AC:H (High): Exploitation requires conditions beyond the attacker's control; the memory layout or specific parameter combination may need to align for successful corruption.
• PR:L (Low): The attacker requires only basic user-level privileges to trigger the IOCTL call.
• UI:R (Required): Some form of user interaction is necessary for exploitation, likely to install or launch the triggering application.
• S:C (Changed): The scope changes — the vulnerable component (a user-space application or driver interface) impacts resources beyond its security authority (the kernel).
• C:L (Low Confidentiality): Limited unauthorized information disclosure is possible.
• I:H (High Integrity): The integrity impact is severe — kernel memory corruption can alter system behavior fundamentally.
• A:L (Low Availability): Some availability impact is possible, likely through system instability or crash.

The Snapdragon G1 Gen 2 is a gaming-focused platform used in handheld gaming devices and mobile gaming hardware. Affected systems include any device running the vulnerable firmware version. No specific affected version ranges have been published, and no patch evidence exists from any tracked source.

Exploitation Scenarios

Because no proof-of-concept, exploit code, or Nuclei template is publicly available, the attack chain below is inferred strictly from the vulnerability class (CWE-787) and the NVD description. No specific function names, API paths, or parameter names are provided in the source data and none are fabricated here.

1. Reconnaissance / Target Identification: An attacker identifies a target device running the Qualcomm Snapdragon G1 Gen 2 Gaming Platform Firmware. The attacker determines which IOCTL commands are exposed by kernel drivers to user space and identifies those that accept parameters which may lack adequate bounds validation. This could involve reverse engineering firmware images or driver binaries available on the device.

2. Triggering the Flaw Class: The attacker develops or obtains a user-space application that issues a crafted IOCTL call to the vulnerable kernel driver. The parameters supplied to the IOCTL are malformed — specifically, they are designed to cause the kernel to write data beyond the allocated buffer boundary (out-of-bounds write). The high attack complexity (AC:H) suggests that specific parameter values or memory layout conditions must be satisfied for the corruption to manifest.

3. Payload / Execution Method: At the vulnerability-class level, the attacker leverages the out-of-bounds write to corrupt kernel memory. Depending on what data structure is adjacent to the overflow, this could result in overwriting function pointers, kernel object metadata, or reference counters. The changed scope (S:C) implies that the corruption crosses a privilege boundary — a user-space process influencing kernel memory.

4. Post-Exploitation Impact: Successful exploitation could allow the attacker to escalate privileges to kernel level, achieve persistent code execution on the device, bypass security controls, or cause a denial of service through kernel panic. The high integrity impact (I:H) indicates that system state can be arbitrarily modified. Confidentiality impact is low (C:L), suggesting limited data exfiltration capability directly from this primitive alone.

The requirement for user interaction (UI:R) implies the attacker must convince a user to install or run the malicious application, increasing the social engineering component of the attack chain.

Impact Assessment

The primary impact is to the integrity of the affected device's kernel (I:H), with limited confidentiality (C:L) and availability (A:L) impact. The scope is changed (S:C), meaning a user-space application can impact kernel-level resources, effectively crossing a security boundary. The overall CVSS score of 6.6 (Medium severity) reflects the combination of a local attack vector, high complexity, user interaction requirement, but severe integrity impact within a changed scope.

Affected Systems: Devices using the Qualcomm Snapdragon G1 Gen 2 Gaming Platform Firmware. This includes handheld gaming consoles, gaming smartphones, and other mobile gaming hardware built on this SoC platform. The blast radius encompasses all users of such devices who install applications from untrusted sources or are targeted by social engineering.

Business Impact: For enterprises that issue or manage such devices, exploitation could lead to compromised endpoints with kernel-level access, potentially bypassing mobile device management (MDM) controls. For consumers, the risk is primarily from malicious applications that could gain elevated privileges on their gaming devices.

Detection Guidance

Sigma Rule

title: Potential Exploitation of CVE-2026-25263 via Malicious IOCTL Call
id: 7c9e4f2a-1b3d-4e5f-8a6b-9c0d1e2f3a4b
status: experimental
description: Detects a user-space process issuing a suspicious IOCTL call to a kernel driver, potentially triggering the out-of-bounds write described in CVE-2026-25263.
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-25263
author: Threat Intelligence Team
date: 2026-01-01
tags:
  - attack.privilege_escalation
  - attack.t1068
  - cve.2026-25263
logsource:
  product: linux
  service: kernel
detection:
  selection_ioctl:
    EventType: 'IOCTL'
    Command:
      - '*invalid*'
      - '*overflow*'
      - '*oob*'
  selection_process:
    Image|endswith:
      - '/sh'
      - '/bash'
      - '/python'
      - '/app_process'
    Image|contains:
      - 'malicious'
      - 'exploit'
      - 'poc'
  condition: selection_ioctl and selection_process
falsepositives:
  - Legitimate driver testing tools
  - Debugging sessions
level: high

YARA Rule

rule CVE_2026_25263_IOCTL_Exploit_Indicator
{
    meta:
        description = "Detects binaries potentially exploiting CVE-2026-25263 through crafted IOCTL calls"
        author = "Threat Intelligence Team"
        date = "2026-01-01"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-25263"
        cve = "CVE-2026-25263"
        severity = "high"

    strings:
        $ioctl_call = { 0F 05 } // syscall instruction placeholder for ioctl (arch-specific)
        $ioctl_str = "ioctl" ascii wide nocase
        $oob_write = "out-of-bounds" ascii wide nocase
        $kernel_driver = "Snapdragon" ascii wide nocase
        $qualcomm = "Qualcomm" ascii wide nocase
        $cve_id = "CVE-2026-25263" ascii wide

    condition:
        uint32(0) == 0x464c457f and // ELF binary
        (2 of ($ioctl_str, $kernel_driver, $qualcomm) or $cve_id) and
        any of ($ioctl_call)
}

Suricata IDS Rule

alert ip any any -> any any (msg:"CVE-2026-25263 - Potential Qualcomm Snapdragon IOCTL Exploit Attempt"; flow:to_server; content:"|0F 05|"; depth:2; content:"ioctl"; nocase; distance:0; within:50; reference:cve,2026-25263; classtype:attempted-admin; sid:10000001; rev:1;)

Elastic Detection

process where event.type == "start" and process.name in ("sh", "bash", "python", "app_process", "exploit") and process.args : ("*ioctl*", "*CVE-2026-25263*", "*oob*") and process.parent.name in ("adb", "shell", "su")

Splunk SPL Query

index=linux sourcetype=syslog
| search ("ioctl" OR "IOCTL") AND ("invalid" OR "overflow" OR "out-of-bounds" OR "CVE-2026-25263")
| stats count min(_time) as firstTime max(_time) as lastTime by host, process_name, user
| where count > 3
| lookup threat_intel cve as "CVE-2026-25263" OUTPUT severity
| table firstTime, lastTime, host, process_name, user, count, severity

Wazuh OSSEC Rule

<group name="cve_2026_25263,qualcomm,snapdragon,">
  <rule id="100100" level="12">
    <decoded_as>json</decoded_as>
    <field name="event_type">ioctl</field>
    <field name="ioctl_command">\.*invalid\.*|\.*overflow\.*|\.*oob\.*</field>
    <description>CVE-2026-25263: Potential Qualcomm Snapdragon IOCTL exploitation - out-of-bounds write attempt detected</description>
    <mitre>
      <id>T1068</id>
    </mitre>
    <group>cve_2026_25263,exploit_attempt,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 — UNPATCHED — no patch evidence from any tracked source.

No vendor fix, workaround, or affected version data is currently available. The following guidance is based on best practices for memory corruption vulnerabilities in kernel IOCTL handlers.

1. Immediate Mitigations:

• Restrict installation of applications to trusted sources only (official app stores with review processes).
• Implement application allowlisting on managed devices to prevent execution of unsigned or unknown applications.
• Monitor device logs for kernel panics, unexpected reboots, or IOCTL-related error messages.
• Reduce user privileges where possible and enforce the principle of least privilege.
• For enterprise-managed devices, consider disabling developer mode and USB debugging if not operationally required.

2. Patch / Upgrade Steps:

• Monitor Qualcomm's security bulletin page and the vendor's advisory channels for an official patch.
• Subscribe to NVD and CISA alerts for CVE-2026-25263 to receive notification when a patch becomes available.
• Once a firmware update is released, test it in a controlled environment before fleet-wide deployment.
• Coordinate with device OEMs (original equipment manufacturers) as firmware updates for Snapdragon platforms are typically distributed through device manufacturers rather than directly by Qualcomm.

3. Long-Term Hardening:

• Implement kernel address space layout randomization (KASLR) and other exploit mitigations if supported by the platform.
• Enable SELinux or equivalent mandatory access control to limit the impact of kernel memory corruption.
• Conduct regular firmware security assessments and vulnerability scanning for embedded/gaming platforms.
• Apply the principle of least privilege to all user-space applications, especially those interacting with kernel drivers.
• Consider hardware-backed security features (e.g., ARM TrustZone, Qualcomm Secure Boot) to detect and prevent tampering with kernel memory.

References

1. NVD — CVE-2026-25263: https://nvd.nist.gov/vuln/detail/CVE-2026-25263
2. CWE-787: Out-of-bounds Write — https://cwe.mitre.org/data/definitions/787.html
3. Qualcomm Security Bulletins — https://www.qualcomm.com/company/product-security/bulletins
4. MITRE ATT&CK T1068 — Exploitation for Privilege Escalation: https://attack.mitre.org/techniques/T1068/
5. CISA Known Exploited Vulnerabilities Catalog (not listed as of report date): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No threat actor campaigns or exploit-in-the-wild evidence have been identified for CVE-2026-25263. EPSS score is 0.00087 (0.3% percentile), indicating a very low probability of exploitation in the wild within the next 30 days. No public proof-of-concept, exploit code, or Nuclei template is available.