{"cve":"CVE-2009-1238","nvd":{"published":"2009-04-02T17:30:00.390","modified":"2026-06-16T23:06:50.013","status":"Modified","description":"Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10.5.6 and earlier allows local users to cause a denial of service (kernel memory corruption) by simultaneously executing the same HFS_SET_PKG_EXTENSIONS code path in multiple threads, which is problematic because of lack of mutex locking for an unspecified global variable.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-362"],"references":["http://secunia.com/advisories/34424","http://www.digit-labs.org/files/exploits/xnu-vfssysctl-dos.c","http://www.informationweek.com/news/hardware/mac/showArticle.jhtml?articleID=216401181","http://www.securityfocus.com/bid/34202","https://www.exploit-db.com/exploits/8265"],"products":["apple:mac_os_x","apple:mac_os_x_server"],"source":"nvd","synced_at":"2026-10-19T19:54:07.895733559+00:00"},"epss":{"cve":"CVE-2009-1238","score":0.0062,"percentile":0.49748,"date":"2026-10-31"},"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."]}