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{"affected": [{"configurations": [{"platform": ["linux", "unix", "macos"], "status": "affected", "versions": null}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "coreutils", "source": "cna", "vendor": "Uutils"}, "product": "coreutils", "vendor": "uutils"}], "analysis": {"en": {"generated_at": "2026-04-28T15:21:10.975246+00:00", "value": {"mitigation_remediation": ["Update uutils coreutils to the latest version that includes the race condition fix.", "If an update is not immediately possible, limit write access to directories where mkfifo is used, ensuring that untrusted users cannot create or rename files there.", "Run mkfifo only under non\u2011privileged accounts or use additional safeguards such as SELinux/AppArmor to enforce strict permission boundaries."], "summary": {"action": "Apply Patch", "impact": "Privilege Escalation via TOCTOU race condition"}, "threat_synthesis": {"affected_systems": "The affected product is uutils coreutils. No specific version numbers are listed, so all current releases prior to the fix are potentially impacted.", "description_and_impact": "The mkfifo utility in uutils coreutils contains a Time\u2011of\u2011Check to Time\u2011of\u2011Use race condition. A local attacker with write access to the parent directory can create a FIFO, then replace it with a symlink before the subsequent chmod operation completes, causing the chmod to affect an arbitrary file. This can allow an attacker to change permissions of critical files when mkfifo is executed with elevated rights, resulting in privilege escalation.", "risk_and_exploitability": "The vulnerability scores a CVSS of 7, indicating moderate to high risk. EPSS score of <1% (approximately 0.0001) indicates a very low probability of exploitation. The vulnerability is not in the CISA KEV catalog. The likely attack vector is local; an attacker must have write permission in the target directory. Exploitation requires the utility to run with elevated privileges, such as a set\u2011uid wrapper or a cron job, making host compromise a real threat under those conditions."}}}}, "created": "2026-04-22T18:15:15.485124+00:00", "updated": "2026-04-28T15:30:34.817864+00:00", "vendors": ["uutils", "uutils$PRODUCT$coreutils"]}