{"id":"CVE-2026-89821","state":"PUBLISHED","title":"drm/amd/display: avoid divide-by-zero in __is_lut_linear()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: avoid divide-by-zero in __is_lut_linear()\n\n__is_lut_linear() computes the expected value of each entry with\n\n\texpected = i * MAX_DRM_LUT_VALUE / (size - 1);\n\nIf it is ever called with a single-entry LUT, size - 1 is zero and the\nkernel takes a divide error (#DE). A LUT with fewer than two entries\ncannot describe a linear mapping anyway, so return false early instead\nof dividing by zero.","publishedAt":"2026-09-16T10:30:53.689Z","updatedAt":"2026-10-19T08:53:15.267Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"2320626425f3af3a25b8afb6876f205b1c6d4e64","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"d1e06d5dc8f12451ce71dc068342660a34476084","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"c127ace7af2b40107947a6504391f94d6fd21734","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"5f18cd1ba873e751bf5547407ad44ea34adfbe2f","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"ee28fafb50f58b847509b5240b431ddec673bdfe","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"15ee43aad0df43dfd1dbb32e7d5b951745c4b87f","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"4f40873f8a4107df2b9c8e68c947c4fd0cd519d2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"]}],"references":["https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64","https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084","https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734","https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44","https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f","https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe","https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f","https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89821.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89821","state":"PUBLISHED","datePublished":"2026-09-16T10:30:53.689Z","dateUpdated":"2026-10-19T08:53:15.267Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.768Z"},"containers":{"cna":{"title":"drm/amd/display: avoid divide-by-zero in __is_lut_linear()","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: avoid divide-by-zero in __is_lut_linear()\n\n__is_lut_linear() computes the expected value of each entry with\n\n\texpected = i * MAX_DRM_LUT_VALUE / (size - 1);\n\nIf it is ever called with a single-entry LUT, size - 1 is zero and the\nkernel takes a divide error (#DE). A LUT with fewer than two entries\ncannot describe a linear mapping anyway, so return false early instead\nof dividing by zero."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"2320626425f3af3a25b8afb6876f205b1c6d4e64","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"d1e06d5dc8f12451ce71dc068342660a34476084","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"c127ace7af2b40107947a6504391f94d6fd21734","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"5f18cd1ba873e751bf5547407ad44ea34adfbe2f","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"ee28fafb50f58b847509b5240b431ddec673bdfe","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"15ee43aad0df43dfd1dbb32e7d5b951745c4b87f","versionType":"git"},{"version":"086247a4b2fba49800b27807f22bb894cd8363fb","status":"affected","lessThan":"4f40873f8a4107df2b9c8e68c947c4fd0cd519d2","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"4.17","status":"affected"},{"version":"0","status":"unaffected","lessThan":"4.17","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.110","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.51","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.5","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_color.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/2320626425f3af3a25b8afb6876f205b1c6d4e64"},{"url":"https://git.kernel.org/stable/c/d1e06d5dc8f12451ce71dc068342660a34476084"},{"url":"https://git.kernel.org/stable/c/c127ace7af2b40107947a6504391f94d6fd21734"},{"url":"https://git.kernel.org/stable/c/4d5ee095a58461b2446d7a6eb0c14c2fe3eaab44"},{"url":"https://git.kernel.org/stable/c/5f18cd1ba873e751bf5547407ad44ea34adfbe2f"},{"url":"https://git.kernel.org/stable/c/ee28fafb50f58b847509b5240b431ddec673bdfe"},{"url":"https://git.kernel.org/stable/c/15ee43aad0df43dfd1dbb32e7d5b951745c4b87f"},{"url":"https://git.kernel.org/stable/c/4f40873f8a4107df2b9c8e68c947c4fd0cd519d2"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:53:15.267Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.12.110"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"6.18.51"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"7.2.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"4.17","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}