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CVE-2026-89821

Unknown

Last modified

CVE-2026-89821 is a vulnerability of currently unknown severity. 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..

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 Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 086247a4b2fba49800b27807f22bb894cd8363fb, < 2320626425f3af3a25b8afb6876f205b1c6d4e64; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < d1e06d5dc8f12451ce71dc068342660a34476084; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < c127ace7af2b40107947a6504391f94d6fd21734; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < 4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < 5f18cd1ba873e751bf5547407ad44ea34adfbe2f; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < ee28fafb50f58b847509b5240b431ddec673bdfe; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < 15ee43aad0df43dfd1dbb32e7d5b951745c4b87f; >= 086247a4b2fba49800b27807f22bb894cd8363fb, < 4f40873f8a4107df2b9c8e68c947c4fd0cd519d2
LinuxLinux4.17

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-89821?
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.
How severe is CVE-2026-89821?
Severity scoring for CVE-2026-89821 is pending analysis.
How do I fix CVE-2026-89821?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST