CVE-2026-89442

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89442

Key Details

CVE	CVE-2026-89442
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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(). (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89442
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89442

Source

Reference

NVD

CVE