CVE-2026-80740
Received Received - Intake

DRM Log Infinite Loop in Linux Kernel

Publication date: 2026-09-03

Last updated on: 2026-09-03

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: drm/log: Fix infinite loop when scale is too large for display When scale is large enough that scaled_font exceeds the display dimensions, rows or columns become 0. A columns value of 0 causes an infinite loop in drm_log_draw_kmsg_record() because the loop never decrements len. Check for zero rows/columns in drm_log_setup_modeset() and return an error, cleaning up the already allocated buffer to avoid a leak.

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Meta Information

Published
2026-09-03
Last Modified
2026-09-03
Generated
2026-09-03
AI Q&A
2026-09-03
EPSS Evaluated
N/A
NVD
CVE-2026-80740
EUVD
EUVD-2026-70344

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability in the Linux kernel occurs when a display scale is set too large, causing the scaled font to exceed display dimensions. This results in rows or columns being set to zero, which triggers an infinite loop in the drm_log_draw_kmsg_record() function because the loop never decrements the length. The issue is addressed by checking for zero rows or columns in drm_log_setup_modeset() and returning an error to clean up allocated memory and prevent leaks.

Detection Guidance

This vulnerability is specific to the Linux kernel's DRM (Direct Rendering Manager) logging functionality. Detection requires checking kernel logs for infinite loop conditions related to display scaling. Monitor system logs for repeated entries indicating drm_log_draw_kmsg_record() or drm_log_setup_modeset() errors.

Impact Analysis

This vulnerability could cause system instability or crashes due to the infinite loop, leading to denial-of-service conditions. It may also consume excessive system resources, degrade performance, or cause applications relying on display rendering to become unresponsive.

Mitigation Strategies

Update the Linux kernel to the latest patched version. If immediate patching is not possible, disable DRM logging temporarily or restrict display scaling operations to prevent the infinite loop condition.

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