{"cve":"CVE-2026-78408","nvd":{"published":"2026-09-02T16:17:23.687","modified":"2026-10-21T18:17:28.793","status":"Awaiting Analysis","description":"The nsenter --join-cgroup option opens the target cgroup.procs file as root and leaves that file descriptor open across later namespace and credential changes and across execve(). Because the kernel checks later cgroup migrations using the credentials from the original open, a program run in an attacker-controlled target can inherit root's ability to move host processes between cgroups. After a privileged operator uses --join-cgroup against that target, an unprivileged user can migrate and terminate unrelated root processes.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:R/S:C/C:N/I:H/A:H","score":7.9},"cwes":["CWE-775"],"references":["https://access.redhat.com/errata/RHSA-2026:63162","https://access.redhat.com/security/cve/CVE-2026-78408","https://bugzilla.redhat.com/show_bug.cgi?id=2522497","https://github.com/util-linux/util-linux/security/advisories/GHSA-55fx-f4gg-cfhj","http://www.openwall.com/lists/oss-security/2026/09/05/2"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-78408","score":0.00193,"percentile":0.08922,"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."]}