CVE-2026-89443 in Linux
Riassunto
di MITRE • 12/09/2026
In the Linux kernel, the following vulnerability has been resolved:
platform/x86: ISST: Validate level in perf mask ioctls
isst_if_get_perf_level_mask() and isst_if_get_base_freq_mask() use the user-provided level as an index into perf_levels[] via
_read_pp_level_info() and _read_bf_level_info(), but neither helper validates it first.
The adjacent level-info helpers reject levels above max_level before reading the same per-level register block. Add the same bounds checks to the mask helpers, and reject disabled SST-PP levels in isst_if_get_perf_level_mask() to match isst_if_get_perf_level_info().
This prevents out-of-bounds reads from the per-level offset table on invalid ioctl input.
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