{"cve":"CVE-2026-90231","nvd":{"published":"2026-09-17T17:17:18.930","modified":"2026-10-21T13:20:43.853","status":"Received","description":"In the Linux kernel, the following vulnerability has been resolved:\n\napparmor: fix unconfined user namespace restriction forced stack\n\nIf a task is already confined by a stack the unprivileged transition\nrestriction on unconfined is not correctly, applied. This results in\nan escape if two transitions through an unconfined profile can be\nexecuted.\n\nFix this by pushing the check into the per profile label build. The\ncheck will always be done against unconfined and result in a stack of\njust the unconfined component when necessary.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","score":8.4},"cwes":[],"references":["https://git.kernel.org/stable/c/08c2f7c8d4b1434cfae006f3daf4d1bce330b57b","https://git.kernel.org/stable/c/7d1099b86356df81c379159bfb8a598aaf83ce81","https://git.kernel.org/stable/c/7da0bdf0610f6d35bbb061536a47fc41646306f0","https://git.kernel.org/stable/c/fdd341654471cae4fbd9635d32b848cd0c8bc437"],"products":[],"source":"nvd","synced_at":"2026-10-22T16:41:11.231219466+00:00"},"epss":{"cve":"CVE-2026-90231","score":0.00171,"percentile":0.06493,"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."]}