{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-90231 in the wild and no public exploit code.","fix":"Apply the vendor's patch.","what":"CVE-2026-90231 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-90231 and fix it if it is affected.\n\nWhat it is: CVE-2026-90231 is a high-severity vulnerability in Linux, published on 17 Sep 2026. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-90231 in the wild and no public exploit code.\n\nAffected product: Linux. No package-level version data is available, so check the vendor advisory linked from the reference page.\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-90231/ (Markdown: https://insights.sbomify.com/CVE-2026-90231/index.md)","id":"CVE-2026-90231","markdown":"https://insights.sbomify.com/CVE-2026-90231/index.md","name":"CVE-2026-90231","record":{"aliases":["BELL-CVE-2026-90231","DEBIAN-CVE-2026-90231","GHSA-24pv-j52f-w4hj","UBUNTU-CVE-2026-90231"],"analysis":{"component_type":"kernel","fix_type":"patch","impacts":["privilege_escalation"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Linux kernel","requires_auth":"low_privilege","summary":"A flaw in AppArmor allows unconfined user namespace restrictions to be bypassed, enabling privilege escalation via stacked transitions.","user_interaction":"not_required","vuln_class":"privilege_escalation"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"Linux","cpe":[],"cvss":{"score":8.4,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N","version":"3.1"},"cwes":[],"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.","ecosystems":[],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"apparmor: fix unconfined user namespace restriction forced stack","id":"CVE-2026-90231","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"privilege_escalation","year":"2026"},"n_packages":0,"n_references":4,"next":{"headline":"amt: Don't support cross-netns setup.","id":"CVE-2026-90232"},"packages":[],"prev":{"headline":"nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()","id":"CVE-2026-90230"},"products":["Linux"],"published":"2026-09-17","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-10-21","vendors":["Linux"]},"summary":"A flaw in AppArmor allows unconfined user namespace restrictions to be bypassed, enabling privilege escalation via stacked transitions.","url":"https://insights.sbomify.com/CVE-2026-90231/"}