CVE-2026-89442

Summary

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: ISST: Validate socket ID in clos_assoc ioctl

isst_if_clos_assoc() validates the user-supplied socket_id with 'socket_id > topology_max_packages()', but isst_common.sst_inst[] is allocated with topology_max_packages() entries, so the valid index range is [0, topology_max_packages()). The '>' comparison lets socket_id == topology_max_packages() pass and index one entry past the array.

In addition, isst_common.sst_inst[socket_id] is NULL for an in-range package that has no bound TPMI SST instance, and the pointer is used without a NULL check. Both the out-of-bounds entry and the NULL pointer are then dereferenced by map_partition_power_domain_id() and the following power_domain_info access.

Reject socket_id >= topology_max_packages() and a NULL sst_inst, matching the checks already performed by get_instance().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux12a7d2cb811dd8a884dea088a2701fcb8d00136e < 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075affected
LinuxLinux12a7d2cb811dd8a884dea088a2701fcb8d00136e < 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6caaffected
LinuxLinux12a7d2cb811dd8a884dea088a2701fcb8d00136e < 207b4dc6eb100141b122b2602504a1429a4b6558affected
LinuxLinux12a7d2cb811dd8a884dea088a2701fcb8d00136e < a89f07db0cb95c54dac4a8406c79a04e44a73c3caffected
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