{"id":"CVE-2009-1238","aliases":["EUVD-2009-1237","GHSA-r3mv-rfx2-rf55"],"status":"published","title":"Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10...","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.","severity":{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-09","score":0.0062,"percentile":0.50022,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":true,"fix_available":false},"cwes":["CWE-362"],"published":"2009-04-02T17:00:00Z","modified":"2026-06-16T23:06:50Z","exploits":[{"source":"exploitdb","id":"EDB-8265","title":"Apple Mac OSX xnu 1228.x - 'vfssysctl' Local Kernel Denial of Service (PoC)","type":"dos","platform":"osx","date":"2009-03-23","verified":true,"url":"https://www.exploit-db.com/exploits/8265"}],"products":[{"vendor":"apple","product":"mac_os_x"},{"vendor":"apple","product":"mac_os_x_server"}],"references":[{"url":"https://www.exploit-db.com/exploits/8265","tags":["exploit","x_refsource_EXPLOIT-DB","x_transferred"]},{"url":"http://www.securityfocus.com/bid/34202","tags":["vdb-entry","x_refsource_BID","x_transferred","Exploit"]},{"url":"http://secunia.com/advisories/34424","tags":["third-party-advisory","x_refsource_SECUNIA","x_transferred"]},{"url":"http://www.digit-labs.org/files/exploits/xnu-vfssysctl-dos.c","tags":["x_refsource_MISC","x_transferred","Exploit"]},{"url":"http://www.informationweek.com/news/hardware/mac/showArticle.jhtml?articleID=216401181","tags":["x_refsource_MISC","x_transferred"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2009-1238"},{"url":"https://github.com/advisories/GHSA-r3mv-rfx2-rf55"}],"sources":{"cve":[{"id":"CVE-2009-1238","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.","status":"published","published":"2009-04-02T17:00:00Z","modified":"2024-08-07T05:04:49.425Z","updated_at":"2026-11-02T14:33:25.126493Z"}],"euvd":[{"id":"EUVD-2009-1237","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.","status":"published","published":"2009-04-02T17:00:00Z","modified":"2024-08-07T05:04:49Z","updated_at":"2026-11-03T01:39:22.935477Z"}],"ghsa":[{"id":"GHSA-r3mv-rfx2-rf55","title":"Race condition in the HFS vfs sysctl interface in XNU 1228.8.20 and earlier on Apple Mac OS X 10...","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.","status":"published","published":"2022-05-02T03:23:04Z","modified":"2023-01-31T05:08:14Z","cwes":["CWE-362"],"updated_at":"2026-11-02T14:49:21.399059Z"}],"nvd":[{"id":"CVE-2009-1238","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.","status":"published","published":"2009-04-02T17:30:00.39Z","modified":"2026-06-16T23:06:50.013Z","cvss":[{"version":"2.0","score":7.2,"vector":"AV:L/AC:L/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-362"],"updated_at":"2026-11-02T14:01:34.44527Z"}]}}