Linux vulnerability

What happened

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.

Affected versions

Linux: ea009e4769fa3bd05d4c111c3b6865eb3a9be829 through before 1a8bab5ceee1a42a78de12d3d69f67516a20588e (git); ea009e4769fa3bd05d4c111c3b6865eb3a9be829 through before 1889a9156553f0692acd57caf15e877baace1a01 (git); ea009e4769fa3bd05d4c111c3b6865eb3a9be829 through before d19385624bdfb577db9c94bb8879992fd5e17bcd (git); ea009e4769fa3bd05d4c111c3b6865eb3a9be829 through before 80e0d353c86a9a168ad6d213f494796294381538 (git); 6.4 Fixed: See vendor advisory.

Why it matters

Review the vendor advisory and exposure of the affected product to determine operational impact.

Detection & mitigation

• Apply vendor-provided updates or mitigations.
• Review affected product exposure and access logs.