CVE-2021-4460: Linux Kernel

High severity, CVSS 7.1. EPSS: 0.2% chance of exploitation in the next 30 days.

In the Linux kernel, the following vulnerability has been resolved: drm/amdkfd: Fix UBSAN shift-out-of-bounds warning If get_num_sdma_queues or get_num_xgmi_sdma_queues is 0, we end up doing a shift operation where the number of bits shifted equals number of bits in the operand. This behaviour is undefined. Set num_sdma_queues or num_xgmi_sdma_queues to ULLONG_MAX, if the count is >= number of bits in the operand. Bug: https://gitlab.freedesktop.org/drm/amd/-/issues/1472

Affected products

• Linux Linux Kernel: before 5.4.118 (fixed in 5.4.118); from 5.5, before 5.10.36 (fixed in 5.10.36); from 5.11, before 5.11.20 (fixed in 5.11.20); from 5.12, before 5.12.3 (fixed in 5.12.3)

Published 2025-10-01. Last modified 2026-08-11.