CVE-2026-90035
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)
How to fix
- Linux Linux4c5b61b9df6ab33b55f228e1b6579cefad11a9f7, ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a, 4814f28c45f58a71a80d09b80a60da6a063b539a, b08c3d5ee7feadd821208f7c2c1ec02a16ce5878, f63de9054da858d57054474c32464106f8375e0d or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ≤ v < 4c5b61b9df6ab33b55f228e1b6579cefad11a9f7, 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ≤ v < ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a, 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ≤ v < 4814f28c45f58a71a80d09b80a60da6a063b539a, 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ≤ v < b08c3d5ee7feadd821208f7c2c1ec02a16ce5878, 8e5cfe547bf3beeb29d9608be68d22dff2b5012b ≤ v < f63de9054da858d57054474c32464106f8375e0d, 6.3 | 4c5b61b9df6ab33b55f228e1b6579cefad11a9f7, ac2ab58a79bf2401ae8c5d1c030bf0a5a376f43a, 4814f28c45f58a71a80d09b80a60da6a063b539a, b08c3d5ee7feadd821208f7c2c1ec02a16ce5878, f63de9054da858d57054474c32464106f8375e0d |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.