{"cve":"CVE-2026-64391","nvd":{"published":"2026-07-25T10:17:22.453","modified":"2026-10-21T13:19:23.330","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: use opener credentials for ADS I/O\n\nAlternate data streams are stored as xattrs. Unlike regular file I/O,\ntheir read and write paths therefore call VFS xattr helpers which recheck\ninode permissions and LSM policy using the current task credentials.\n\nRun ADS I/O with the credentials captured when the SMB handle was opened.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8},"cwes":[],"references":["https://git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234","https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab","https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce","https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d","https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-64391","score":0.00457,"percentile":0.39407,"date":"2026-10-26"},"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."]}