{"id":"CVE-2026-89819","published":"2026-09-16T11:16:47.253","lastModified":"2026-09-16T15:18:11.173","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: validate plane degamma LUT size for private color prop\n\nUnlike the CRTC degamma path, which is guarded by\namdgpu_dm_verify_lut_sizes(), the per-plane degamma LUT size was never\nvalidated before use. __set_dm_plane_degamma() passed the user-supplied\nsize straight into __is_lut_linear() and, for a non-linear LUT, into\n__set_input_tf() -> __drm_lut_to_dc_gamma(), the latter always iterating\nMAX_COLOR_LUT_ENTRIES entries regardless of the actual LUT size.\n\nA malformed AMD_PLANE_DEGAMMA_LUT blob (e.g. a single entry) could thus\ntrigger a divide-by-zero in __is_lut_linear() or an out-of-bounds read in\n__drm_lut_to_dc_gamma(). Reject any plane degamma LUT whose size does not\nmatch MAX_COLOR_LUT_ENTRIES, mirroring the invariant the code already\nasserts a few lines below (and which the CRTC path enforces).\n\nThe AMD_PLANE_DEGAMMA_LUT property is only exposed on builds with\nAMD_PRIVATE_COLOR defined.","cvssScore":7.8,"cvssSeverity":"HIGH","cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5","tags":[]},{"url":"https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f","tags":[]},{"url":"https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4","tags":[]},{"url":"https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}