CVE-2026-89443
Description
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.
How to fix
- Linux Linuxbeb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68, 1a8bab5ceee1a42a78de12d3d69f67516a20588e, 1889a9156553f0692acd57caf15e877baace1a01, d19385624bdfb577db9c94bb8879992fd5e17bcd, 80e0d353c86a9a168ad6d213f494796294381538 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | ea009e4769fa3bd05d4c111c3b6865eb3a9be829 ≤ v < beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68, ea009e4769fa3bd05d4c111c3b6865eb3a9be829 ≤ v < 1a8bab5ceee1a42a78de12d3d69f67516a20588e, ea009e4769fa3bd05d4c111c3b6865eb3a9be829 ≤ v < 1889a9156553f0692acd57caf15e877baace1a01, ea009e4769fa3bd05d4c111c3b6865eb3a9be829 ≤ v < d19385624bdfb577db9c94bb8879992fd5e17bcd, ea009e4769fa3bd05d4c111c3b6865eb3a9be829 ≤ v < 80e0d353c86a9a168ad6d213f494796294381538, 6.4 | beb22ebf76c0415f22d2d0c3f1ff0627e7ae4a68, 1a8bab5ceee1a42a78de12d3d69f67516a20588e, 1889a9156553f0692acd57caf15e877baace1a01, d19385624bdfb577db9c94bb8879992fd5e17bcd, 80e0d353c86a9a168ad6d213f494796294381538 |
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