What’s Vulnerable › Vulnerabilities

CVE-2026-89821: drm/amd/display: avoid divide-by-zero in __is_lut_linear()

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-16 · updated 2026-10-19

Description

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.

Affected products

• Linux kernel: 4.17 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f
• https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64
• https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44
• https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2
• https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f
• https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734
• https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084
• https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe

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