CVE-2026-89821

Unknown

Published: 16/09/2026(UTC)Translated: 16/09/2026(UTC)NVD NIST

Summary

In the Linux kernel, __is_lut_linear() in the drm/amd/display driver computes the expected value of each entry as i * MAX_DRM_LUT_VALUE / (size - 1). With a single-entry LUT, size - 1 is zero, causing a divide error (#DE) in the kernel.

Risk Assessment

This may lead to a kernel panic (denial of service) when called with a LUT containing fewer than two entries.

Recommendation

Update the Linux kernel to a version with the fix that returns false early for LUTs with fewer than two entries.

Other vulnerabilities in Linux kernel (drm/amd/display)

CVE-2026-43320Medium
A vulnerability related to the eDP issue in the drm/amd/display module has been fixed in the Linux kernel, which required adding a function hook check before use.

Original NVD description (English source)

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: avoid divide-by-zero in __is_lut_linear() __is_lut_linear() computes the expected value of each entry with expected = i * MAX_DRM_LUT_VALUE / (size - 1); If it is ever called with a single-entry LUT, size - 1 is zero and the kernel takes a divide error (#DE). A LUT with fewer than two entries cannot describe a linear mapping anyway, so return false early instead of dividing by zero.

Vulnerability data from NVD (NIST) · CISA KEV · EPSS