CVE-2026-89442platform/x86: ISST: Validate socket ID in clos_assoc ioctl
- 7.8HighCVSS base score
- 0.17%Exploitation in 30 daysEPSS · top 94% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
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().
Timeline
ID reserved
By Linux
Published
- 38 days later
· 38 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | High7.8 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.17% · top 94% of all CVEs (14 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.8.
Affected products
- affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e – < c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8
- affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e – < 0d90ab5f80e19cddfeb0c9fab47a1f34aa932075
- affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e – < 82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca
- affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e – < 207b4dc6eb100141b122b2602504a1429a4b6558
- affected 12a7d2cb811dd8a884dea088a2701fcb8d00136e – < a89f07db0cb95c54dac4a8406c79a04e44a73c3c
- affected 6.4
- unaffected < 6.4
- unaffected 6.6.157 – ≤ 6.6.*
- unaffected 6.12.109 – ≤ 6.12.*
- unaffected 6.18.50 – ≤ 6.18.*
- unaffected 7.2.4 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References5
- https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8 (opens in a new tab)
- https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075 (opens in a new tab)
- https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca (opens in a new tab)
- https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558 (opens in a new tab)
- https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-76348 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-89442)Record last updated .