{"id":"CVE-2023-3866","url":"https://www.cyber-defence.io/tools/cve/CVE-2023-3866","generatedAt":"2026-11-02T14:55:36.760Z","title":"In the Linux kernel, the following vulnerability has been resolved: ksmbd: validate session id and tree id in the compound request This patch validate session id and tree id in compound request.","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.","published":"2025-08-16T14:15:27.000Z","lastModified":"2026-08-04T10:18:26.000Z","status":"Modified","sourceIdentifier":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","cvss":{"version":"3.1","score":5.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"cwe":["CWE-476"],"affected":["linux/linux kernel"],"epss":{"score":0.12473,"percentile":0.96219,"date":"2026-11-01","history":[{"date":"2026-10-16","score":0.12473,"percentile":0.96176}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"urgent","text":"EPSS puts the probability of exploitation in the next 30 days at 12.5%, higher than 96% of all known CVEs. Patch or mitigate before the next change window."},"changes":[],"references":[{"url":"https://git.kernel.org/stable/c/5005bcb4219156f1bf7587b185080ec1da08518e","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/854156d12caa9d36de1cf5f084591c7686cc8a9d","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d1066c1b3663401cd23c0d6e60cdae750ce00c0f","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/eb947403518ea3d93f6d89264bb1f5416bb0c7d0","tags":["Patch"],"source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2023-3866","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}