UNKNOWN NVD
CVE-2026-98176
In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc The low 6 bits of cp_hq
In the Linux kernel, the following vulnerability has been resolved:
drm/amdkfd: Avoid integer underflow with ffs in EOP ring size calc
The low 6 bits of cp_hqd_eop_control store the base-2 logarithm
of the EOP ring size. This was calculated as
ffs(q->eop_ring_buffer_size / sizeof(unsigned int)) - 1 - 1
But ffs can in theory return 1 or 0, so this could underflow
(although in practice the ring buffer size cannot be less than 4096).
Change this to
ffs(q->eop_ring_buffer_size / sizeof(unsigned int) / 4)
using properties of logarithms.
(cherry picked from commit 4f18c56630383c14bfc6b2d65f88f2f895d2121a)
References
- https://git.kernel.org/stable/c/82e1b8299c6da02ce02185c208d2fdf7572b5ea1
- https://git.kernel.org/stable/c/c883d0a132d430ef7ebb23fd94323be94d0fbdb8
This unknown severity vulnerability was published on 2026-10-06 via NVD.
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