Answer in brief
CVE-2026-89442 records a High severity (CVSS 7.8) vulnerability in platform/x86: ISST: Validate socket ID in clos_assoc ioctl. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <207b4dc6eb100141b122b2602504a1429a4b6558 || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <a89f07db0cb95c54dac4a8406c79a04e44a73c3c | 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075, 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca, 207b4dc6eb100141b122b2602504a1429a4b6558, a89f07db0cb95c54dac4a8406c79a04e44a73c3c |
| Linux/Linuxgeneric | 6.4 | Not reported |
| Linux/Linuxgeneric | >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8 || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <207b4dc6eb100141b122b2602504a1429a4b6558 || >=12a7d2cb811dd8a884dea088a2701fcb8d00136e <a89f07db0cb95c54dac4a8406c79a04e44a73c3c | c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8, 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075, 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca, 207b4dc6eb100141b122b2602504a1429a4b6558, a89f07db0cb95c54dac4a8406c79a04e44a73c3c |
Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 11, 2026
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().
Quoted source text, attributed separately from HOL analysis.