CVE-2026-24083: IOCTL Driver Buffer Overflow Vulnerability

CVE-2026-24083 Overview

CVE-2026-24083 is a memory corruption vulnerability in Qualcomm device drivers. The flaw occurs while processing Input/Output Control (IOCTL) requests that contain invalid arguments. A local, authenticated attacker can trigger untrusted pointer dereference conditions [CWE-822] by submitting crafted IOCTL calls to affected drivers. Successful exploitation can result in kernel-level memory corruption, leading to code execution in kernel context, privilege escalation, or system compromise. Qualcomm disclosed the issue in its August 2026 Security Bulletin.

Critical Impact
Local attackers with low privileges can corrupt kernel memory through malformed IOCTL requests, potentially executing arbitrary code with kernel privileges and gaining full control of the affected device.

Affected Products

Qualcomm device drivers referenced in the August 2026 Security Bulletin
Systems and mobile devices integrating vulnerable Qualcomm driver components
Downstream OEM firmware that ships the affected driver code

Discovery Timeline

2026-08-04 - CVE-2026-24083 published to the National Vulnerability Database
2026-08-06 - Last updated in NVD database

Technical Details for CVE-2026-24083

Vulnerability Analysis

The vulnerability is classified under [CWE-822: Untrusted Pointer Dereference]. It resides in the IOCTL handling path of an affected Qualcomm device driver. When the driver processes IOCTL requests, it fails to properly validate arguments supplied from user space before using them in pointer operations. This missing validation allows an attacker-controlled value to be treated as a trusted pointer inside the kernel.

An attacker who can open a handle to the driver and issue ioctl() calls can supply crafted arguments that cause the kernel to dereference an invalid or attacker-influenced address. The result is memory corruption inside the kernel address space. Because the vulnerable code executes at kernel privilege, corruption can be leveraged to modify kernel structures, hijack control flow, or overwrite security-relevant data.

Root Cause

The root cause is insufficient argument validation in the driver's IOCTL dispatcher. User-supplied fields are consumed as pointers or used to compute pointer offsets without verifying that the values reference valid, driver-owned memory. This allows a local caller to influence kernel-mode memory accesses.

Attack Vector

Exploitation requires local access with low privileges and no user interaction. The attacker opens the vulnerable driver device node and issues ioctl() requests carrying malformed argument structures. The driver then performs an untrusted pointer dereference, corrupting kernel memory. The vulnerability manifests within the IOCTL handling routines of the affected Qualcomm driver. Refer to the Qualcomm Security Bulletin August 2026 for component-specific technical details.

Detection Methods for CVE-2026-24083

Indicators of Compromise

Unexpected kernel panics, oops messages, or reboots referencing the affected Qualcomm driver in kernel logs
Unprivileged processes issuing an unusual volume of ioctl() calls against Qualcomm driver device nodes
New or unsigned processes opening handles to driver device files typically used only by system services

Detection Strategies

Collect and centralize kernel logs (dmesg, logcat, vendor ramoops) to identify crashes or memory faults inside Qualcomm driver code paths
Monitor for privilege escalation chains where a local low-privileged process gains elevated capabilities shortly after interacting with a driver device node
Alert on installation or execution of unsigned binaries that invoke IOCTL interfaces on Qualcomm-specific device files

Monitoring Recommendations

Baseline expected IOCTL callers per driver and flag deviations from that baseline
Correlate kernel crash telemetry with process execution telemetry to attribute faults to specific binaries
Track patch level attributes on managed endpoints and mobile devices to identify hosts still exposed to the August 2026 Qualcomm bulletin issues

How to Mitigate CVE-2026-24083

Immediate Actions Required

Apply the Qualcomm patches referenced in the August 2026 Security Bulletin as soon as OEM firmware updates are available
Inventory devices running affected Qualcomm chipsets and prioritize updates for systems that permit untrusted local code execution
Restrict local access to the affected systems and enforce least-privilege on accounts and applications interacting with driver interfaces

Patch Information

Qualcomm has released fixes documented in the Qualcomm Security Bulletin August 2026. Downstream OEMs must integrate these fixes into their firmware and push updates to end-user devices. Verify that device build fingerprints reflect a security patch level at or after the August 2026 Qualcomm bulletin.

Workarounds

Limit installation of untrusted third-party applications that could invoke vulnerable IOCTL interfaces
Where feasible, restrict permissions on affected driver device nodes to trusted system components only
Enforce application allow-listing and mobile device management policies to reduce the local attack surface until patched firmware is deployed

bash

# Verify Android security patch level on a managed device
adb shell getprop ro.build.version.security_patch

# Expected output should be 2026-08-01 or later once the Qualcomm
# August 2026 bulletin fixes have been integrated by the OEM