platform/x86: ISST: Validate socket ID in clos_assoc ioctl

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89442
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:24 UTC
Updated2026-09-11 20:19:24 UTC
DescriptionIn 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().

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 git Not specified
CNA Linux Linux affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca git Not specified
CNA Linux Linux affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e 207b4dc6eb100141b122b2602504a1429a4b6558 git Not specified
CNA Linux Linux affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e a89f07db0cb95c54dac4a8406c79a04e44a73c3c git Not specified
CNA Linux Linux affected 6.4 Not specified
CNA Linux Linux unaffected 6.4 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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