{"cve":"CVE-2026-64558","nvd":{"published":"2026-07-29T17:16:53.410","modified":"2026-10-19T21:17:46.043","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ns390/pkey: Check length in pkey_pckmo handler implementation\n\nExplicitly check the length of the target buffer in the pkey_pckmo\nimplementation of the key_to_protkey() handler function. The handler\nfunction fails, if the generated output data exceeds the length of the\nprovided target buffer.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-122"],"references":["https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc","https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4","https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da","https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989"],"products":[],"source":"nvd","synced_at":"2026-10-21T03:56:58.798400159+00:00"},"epss":{"cve":"CVE-2026-64558","score":0.0012,"percentile":0.01831,"date":"2026-10-25"},"kev":null,"osv":[],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}