{"id":"CVE-2026-90035","revision":"aae81ffb380e453e931e8595a052b063","records":[{"revision":"aae81ffb380e453e931e8595a052b063","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-90035","aliases":[],"title":"drm/amd/display: fix division by zero in get_estimated_bw()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/amd/display: fix division by zero in get_estimated_bw()\n\nget_estimated_bw() divides by link->dpia_bw_alloc_config.bw_granularity,\nwhich is zeroed by reset_bw_alloc_struct() and only populated once\nDP_TUNNELING_BW_ALLOC_CAP_CHANGED has been handled.\n\nlink_dp_dpia_handle_bw_alloc_status(), the DPCD interrupt handler,\ncalls get_estimated_bw() whenever DP_TUNNELING_ESTIMATED_BW_CHANGED\nis set, independently of whether DP_TUNNELING_BW_ALLOC_CAP_CHANGED\nhas ever fired for that link. A connected USB4/DPIA tunneling device\nthat reports an estimated-bandwidth change before ever reporting a\ncapability change drives a division by zero in this IRQ path.\n\nlink_dpia_send_bw_alloc_request() already guards the same\nbw_granularity division; add the identical guard here rather than\nintroducing a new pattern.\n\n(cherry picked from commit f2a961457c33dc34223aad5c9e8971de34a4eed3)","state":0,"publishedAt":"2026-09-16T10:33:35.281+00:00","modifiedAt":"2026-10-19T08:56:52.337+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"8e5cfe547bf3beeb29d9608be68d22dff2b5012b\",\n                            \"lessThan\": \"4c5b61b9df6ab33b55f228e1b6579cefad11a9f7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8e5cfe547bf3beeb29d9608be68d22dff2b5012b\",\n                            \"lessThan\": \"ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8e5cfe547bf3beeb29d9608be68d22dff2b5012b\",\n                            \"lessThan\": \"4814f28c45f58a71a80d09b80a60da6a063b539a\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8e5cfe547bf3beeb29d9608be68d22dff2b5012b\",\n                            \"lessThan\": \"b08c3d5ee7feadd821208f7c2c1ec02a16ce5878\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"8e5cfe547bf3beeb29d9608be68d22dff2b5012b\",\n                            \"lessThan\": \"f63de9054da858d57054474c32464106f8375e0d\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"drivers/gpu/drm/amd/display/dc/link/protocols/link_dp_dpia_bw.c\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"6.3\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"6.3\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.157\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.110\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.51\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2.5\",\n                            \"lessThanOrEqual\": \"7.2.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.3\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/4c5b61b9df6ab33b55f228e1b6579cefad11a9f7","https://git.kernel.org/stable/c/ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a","https://git.kernel.org/stable/c/4814f28c45f58a71a80d09b80a60da6a063b539a","https://git.kernel.org/stable/c/b08c3d5ee7feadd821208f7c2c1ec02a16ce5878","https://git.kernel.org/stable/c/f63de9054da858d57054474c32464106f8375e0d"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-90035","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-90035","identifiers":["CVE-2026-90035"]},"retained":false,"historicalAffected":[]}],"coverage":[]}