platform/x86: ISST: Validate socket ID in clos_assoc ioctl
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().
CVE-2026-89442
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-89442
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
"lessThan": "c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8",
"versionType": "git"
},
{
"status": "affected",
"version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
"lessThan": "0d90ab5f80e19cddfeb0c9fab47a1f34aa932075",
"versionType": "git"
},
{
"status": "affected",
"version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
"lessThan": "82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca",
"versionType": "git"
},
{
"status": "affected",
"version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
"lessThan": "207b4dc6eb100141b122b2602504a1429a4b6558",
"versionType": "git"
},
{
"status": "affected",
"version": "12a7d2cb811dd8a884dea088a2701fcb8d00136e",
"lessThan": "a89f07db0cb95c54dac4a8406c79a04e44a73c3c",
"versionType": "git"
}
],
"programFiles": [
"drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "6.4"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "6.4",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "6.6.157",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.109",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.50",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "7.2.4",
"versionType": "semver",
"lessThanOrEqual": "7.2.*"
},
{
"status": "unaffected",
"version": "7.3",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-89442
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #34976 · Revision 1
- Added to Heist Feed
- Publisher date