{"id":"CVE-2026-90035","published":"2026-09-16T11:17:16.690","lastModified":"2026-09-16T11:17:16.690","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)","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/4814f28c45f58a71a80d09b80a60da6a063b539a","tags":[]},{"url":"https://git.kernel.org/stable/c/4c5b61b9df6ab33b55f228e1b6579cefad11a9f7","tags":[]},{"url":"https://git.kernel.org/stable/c/ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a","tags":[]},{"url":"https://git.kernel.org/stable/c/b08c3d5ee7feadd821208f7c2c1ec02a16ce5878","tags":[]},{"url":"https://git.kernel.org/stable/c/f63de9054da858d57054474c32464106f8375e0d","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}