{"id":"CVE-2026-89819","title":"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 d…","summary":"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 d…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"Linux","product":"Linux","affected":["Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c < f6f04d8ae5725bcc893bdc62e3467efd97255c5b","Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c < 0b2615b8b54f58bbdf986dffb38cbc35214a5cc5","Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c < b10cc09b329245c6d95f8fa3e7f068575e3e0e9f","Linux >= 980f8710075acaeb226a94cde6dda8ffad30123c < e4c3ab59021e7c146a84b6671f0d530972bd58b4","Linux 6.8"],"published":"2026-09-16","updated":"2026-09-16","sourceUpdated":"2026-09-16T15:18:11.173","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89819","references":[{"url":"https://git.kernel.org/stable/c/0b2615b8b54f58bbdf986dffb38cbc35214a5cc5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b10cc09b329245c6d95f8fa3e7f068575e3e0e9f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e4c3ab59021e7c146a84b6671f0d530972bd58b4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f6f04d8ae5725bcc893bdc62e3467efd97255c5b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-09-16T10:53:54.003Z","epss":0.00175,"epssPercentile":0.06157,"slug":"CVE-2026-89819","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":205226,"id":"CVE-2026-89819","ts":1789570705818,"field":"cvss","old":null,"new":"7.8"},{"seq":205225,"id":"CVE-2026-89819","ts":1789570705818,"field":"severity","old":"none","new":"high"}]}