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A vulnerability in the Linux kernel's drm/amdkfd component affects the debug address watch v2 functionality. The flaw stems from inconsistent handling of the userspace-supplied watch_id parameter: the clear path accepts watch_id as an unsigned 32-bit value, while helper logic used signed integer handling and bit-shift operations based on that value. When a very large watch_id is supplied from userspace, it can be converted to a negative signed value, causing undefined behavior through invalid shifts and allowing access outside the watch_points array. The vulnerable path is identified in kfd_dbg_trap_clear_dev_address_watch(), where insufficient validation of watch_id before indexing watch_points can result in a buffer overflow. The fix adds explicit validation that watch_id is less than MAX_WATCH_ADDRESSES before use, applies the same early validation in the set path, and replaces unsafe manual bit operations with BIT(watch_id) for safe bit testing and clearing.
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A Linux kernel vulnerability in drm/amdkfd debug address watch handling where an oversized userspace-supplied watch_id can be converted to a negative signed value, leading to invalid bit shifts and out-of-bounds access of the watch_points array, resulting in a buffer overflow/undefined behavior.
A specific vulnerability affecting Red Hat Enterprise Linux 10.2 kernel-related packages; the content does not provide technical details beyond listing it in the advisory.
A specific vulnerability affecting Red Hat Enterprise Linux 9 kernel-related packages, referenced in RHSA-2026:57252.
Linux kernel drm/amdkfd bounds-checking flaw in debug address watch handling.
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