CVE-2026-90035 - drm/amd/display: fix division by zero in get_estimated_bw()

CVE-2026-90035 - drm/amd/display: fix division by zero in get_estimated_bw()

https://cvefeed.io/rssfeed/latest.atom / Wed, 09/16/2026 - 13:32
CVE ID :CVE-2026-90035
Published : Sept. 16, 2026, 10:33 a.m. | 34 minutes ago
Description :In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: fix division by zero in get_estimated_bw() get_estimated_bw() divides by link->dpia_bw_alloc_config.bw_granularity, which is zeroed by reset_bw_alloc_struct() and only populated once DP_TUNNELING_BW_ALLOC_CAP_CHANGED has been handled. link_dp_dpia_handle_bw_alloc_status(), the DPCD interrupt handler, calls get_estimated_bw() whenever DP_TUNNELING_ESTIMATED_BW_CHANGED is set, independently of whether DP_TUNNELING_BW_ALLOC_CAP_CHANGED has ever fired for that link. A connected USB4/DPIA tunneling device that reports an estimated-bandwidth change before ever reporting a capability change drives a division by zero in this IRQ path. link_dpia_send_bw_alloc_request() already guards the same bw_granularity division; add the identical guard here rather than introducing a new pattern. (cherry picked from commit f2a961457c33dc34223aad5c9e8971de34a4eed3)
Severity: 0.0 | NA
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