UNKNOWN NVD
CVE-2026-98177
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
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)
References
- https://git.kernel.org/stable/c/287a34c4d712e0bdb67751e21316d9c8d75a528a
- https://git.kernel.org/stable/c/8ee521b8b189799e361d4233c5180ba56656d4d4
This unknown severity vulnerability was published on 2026-10-06 via NVD.
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