CVE-2026-89442 in Linux
要約
〜によって MITRE • 2026年09月12日
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().
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