CVE-2026-89821

Summary

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

VendorProductVersion RangeStatus
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < 2320626425f3af3a25b8afb6876f205b1c6d4e64affected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < d1e06d5dc8f12451ce71dc068342660a34476084affected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < c127ace7af2b40107947a6504391f94d6fd21734affected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < 4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44affected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < 5f18cd1ba873e751bf5547407ad44ea34adfbe2faffected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < ee28fafb50f58b847509b5240b431ddec673bdfeaffected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < 15ee43aad0df43dfd1dbb32e7d5b951745c4b87faffected
LinuxLinux086247a4b2fba49800b27807f22bb894cd8363fb < 4f40873f8a4107df2b9c8e68c947c4fd0cd519d2affected
LinuxLinux4.17affected
LinuxLinux0 < 4.17unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References