{"cve":"CVE-2023-3866","nvd":{"published":"2025-08-16T14:15:27.383","modified":"2026-08-04T10:18:25.907","status":"Modified","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: validate session id and tree id in the compound request\n\nThis patch validate session id and tree id in compound request.\nIf first operation in the compound is SMB2 ECHO request, ksmbd bypass\nsession and tree validation. So work->sess and work->tcon could be NULL.\nIf secound request in the compound access work->sess or tcon, It cause\nNULL pointer dereferecing error.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","score":5.5},"cwes":["CWE-476"],"references":["https://git.kernel.org/stable/c/5005bcb4219156f1bf7587b185080ec1da08518e","https://git.kernel.org/stable/c/854156d12caa9d36de1cf5f084591c7686cc8a9d","https://git.kernel.org/stable/c/d1066c1b3663401cd23c0d6e60cdae750ce00c0f","https://git.kernel.org/stable/c/eb947403518ea3d93f6d89264bb1f5416bb0c7d0"],"products":["linux:linux_kernel"],"source":"nvd","synced_at":"2026-10-19T22:06:45.861874017+00:00"},"epss":{"cve":"CVE-2023-3866","score":0.12473,"percentile":0.96218,"date":"2026-10-31"},"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."]}