GHSA-66VV-5F3V-P2FX
Vulnerability from github – Published: 2026-09-11 21:31 – Updated: 2026-09-14 15:32In 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": [],
"aliases": [
"CVE-2026-89442"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-11T20:19:24Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nplatform/x86: ISST: Validate socket ID in clos_assoc ioctl\n\nisst_if_clos_assoc() validates the user-supplied socket_id with\n\u0027socket_id \u003e topology_max_packages()\u0027, but isst_common.sst_inst[] is\nallocated with topology_max_packages() entries, so the valid index range\nis [0, topology_max_packages()). The \u0027\u003e\u0027 comparison lets\nsocket_id == topology_max_packages() pass and index one entry past the\narray.\n\nIn addition, isst_common.sst_inst[socket_id] is NULL for an in-range\npackage that has no bound TPMI SST instance, and the pointer is used\nwithout a NULL check. Both the out-of-bounds entry and the NULL pointer\nare then dereferenced by map_partition_power_domain_id() and the\nfollowing power_domain_info access.\n\nReject socket_id \u003e= topology_max_packages() and a NULL sst_inst, matching\nthe checks already performed by get_instance().",
"id": "GHSA-66vv-5f3v-p2fx",
"modified": "2026-09-14T15:32:23Z",
"published": "2026-09-11T21:31:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89442"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
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