CVE-2026-89819
HighCVSS 7.8Summary
In the Linux kernel DRM/AMD Display subsystem, the per-plane degamma LUT size is not validated, potentially leading to divide-by-zero or out-of-bounds read. The issue affects the AMD_PLANE_DEGAMMA_LUT property, only available when built with AMD_PRIVATE_COLOR.
Risk Assessment
The risk includes driver crash, potential memory corruption, or system hang due to maliciously crafted input.
Recommendation
It is recommended to update the Linux kernel to a version with the fix that rejects invalid LUT sizes, as expected.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: validate plane degamma LUT size for private color prop Unlike the CRTC degamma path, which is guarded by amdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never validated before use. __set_dm_plane_degamma() passed the user-supplied size straight into __is_lut_linear() and, for a non-linear LUT, into __set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating MAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size. A malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus trigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in __drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not match MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already asserts a few lines below (and which the CRTC path enforces). The AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with AMD_PRIVATE_COLOR defined.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS