{"cve":"CVE-2026-64138","nvd":{"published":"2026-07-19T16:17:55.680","modified":"2026-10-21T13:19:21.070","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate SID in parent security descriptor during ACL inheritance\n\nIntroduce smb_validate_ntsd_sid() helper to safely validate Owner SID\nand Group SID inside the NT Security Descriptor (smb_ntsd) retrieved\nfrom the parent directory.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":8.8},"cwes":[],"references":["https://git.kernel.org/stable/c/18d8db24b0a5b7be4829238dd4022236df02d421","https://git.kernel.org/stable/c/1c9d0646a9959752f11ca1080dc1ff26bd1756cb","https://git.kernel.org/stable/c/69f030cf95488ae1186c72ac8c66fd279664ea7f","https://git.kernel.org/stable/c/8efbea0253b7fa2d1960cab0fed36544ca0b41ab","https://git.kernel.org/stable/c/f0e5c9c663badc9982e6941322eef1cb17de0f11"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-64138","score":0.00415,"percentile":0.35495,"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."]}