drm/amdkfd: Avoid integer underflow in EOP ring size calculation.
CVE-2026-98177 is fixed in linux on 1 platform by DEBIAN-CVE-2026-98177 (version 7.2.8-1), released October 6, 2026. It is not reported as exploited. Patch Radar priority: Urgent.
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid integer underflow in EOP ring size calculation. The low 6 bits of cp_hqd_eop_control store the base-2 logarithm of the EOP ring size. This was calculated as order_base_2(q->eop_ring_buffer_size / 4) - 1 But order_base_2 can in theory return 0, so this could underflow (although in practice the ring buffer size cannot be less than 4096). Change this to order_base_2(q->eop_ring_buffer_size / 8) using properties of logarithms. Also add to the above comment to make the mathematics more clear. (cherry picked from commit f0f43fcf8b2b3a924cad9444340921c96ed5f634)
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| linux · Debian 14 | 7.2.8-1 | DEBIAN-CVE-2026-98177 | Oct 6, 2026 |
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