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().
References
Configurations
No configuration.
History
No history.
Information
Published : 2026-09-11 20:19
Updated : 2026-09-14 13:19
NVD link : CVE-2026-89442
Mitre link : CVE-2026-89442
CVE.ORG link : CVE-2026-89442
JSON object : View
Products Affected
No product.
CWE
No CWE.