CVE-2026-89443

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxea009e4769fa3bd05d4c111c3b6865eb3a9be829 < 1a8bab5ceee1a42a78de12d3d69f67516a20588eaffected
LinuxLinuxea009e4769fa3bd05d4c111c3b6865eb3a9be829 < 1889a9156553f0692acd57caf15e877baace1a01affected
LinuxLinuxea009e4769fa3bd05d4c111c3b6865eb3a9be829 < d19385624bdfb577db9c94bb8879992fd5e17bcdaffected
LinuxLinuxea009e4769fa3bd05d4c111c3b6865eb3a9be829 < 80e0d353c86a9a168ad6d213f494796294381538affected
LinuxLinux6.4affected
LinuxLinux0 < 6.4unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References