CVE-2026-68253

Received Received - Intake

Buffer Overflow in Linux Kernel DRM/i915 HDCP

Publication date: 2026-08-10

Last updated on: 2026-08-23

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: drm/i915/hdcp: check streams[] bounds before overflow The data->streams[] overflow check is done after the buffer overflow has already happened. Move the overflow check before the write. Side note, emitting a warning splat with a backtrace might be overkill here, but prefer not changing the behaviour other than not doing the overrun. Discovered using AI-assisted static analysis confirmed by Intel Product Security. (cherry picked from commit 9284ab3b6e776c315883ac2611283d263c9460fd)

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-08-10

Last Modified

2026-08-23

Generated

2026-08-30

AI Q&A

2026-08-10

EPSS Evaluated

2026-08-29

NVD

CVE-2026-68253

EUVD

EUVD-2026-55354

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	to 416baaa9-dc9f-4396-8d5f-8c081fb06d67 (inc)
linux	linux_kernel	to 9284ab3b6e776c315883ac2611283d263c9460fd (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability involves a buffer overflow in the Linux kernel's drm/i915/hdcp component. The issue occurs because the overflow check for the data->streams[] array is performed after the buffer overflow has already happened, allowing data to be written beyond the intended bounds.

Detection Guidance

This vulnerability is specific to the Linux kernel's drm/i915/hdcp component and involves a buffer overflow in streams[]. Detection requires checking for kernel logs or backtraces related to HDCP (High-bandwidth Digital Content Protection) errors or warnings. Monitor kernel logs for HDCP-related errors or unusual behavior in graphics drivers.

Impact Analysis

An attacker could exploit this to cause memory corruption, leading to system crashes, privilege escalation, or unauthorized access. Systems using affected Linux kernel versions with Intel i915 graphics may be vulnerable.

Compliance Impact

This vulnerability involves a buffer overflow in the Linux kernel's drm/i915/hdcp component, where bounds checking occurs after the overflow has already happened. While this could potentially lead to memory corruption or unauthorized access, the provided context does not specify direct impacts on data confidentiality or integrity required for compliance with standards like GDPR or HIPAA.

Mitigation Strategies

Update your Linux kernel to the latest stable version that includes the fix for this vulnerability. If you are using a distribution with long-term support, apply the relevant kernel patches as soon as they become available. Avoid using untrusted graphics drivers or configurations that may trigger HDCP-related code paths until patched.

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