{"id":"CVE-2025-38282","summary":"kernfs: Relax constraint in draining guard","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nkernfs: Relax constraint in draining guard\n\nThe active reference lifecycle provides the break/unbreak mechanism but\nthe active reference is not truly active after unbreak -- callers don't\nuse it afterwards but it's important for proper pairing of kn-\u003eactive\ncounting. Assuming this mechanism is in place, the WARN check in\nkernfs_should_drain_open_files() is too sensitive -- it may transiently\ncatch those (rightful) callers between\nkernfs_unbreak_active_protection() and kernfs_put_active() as found out by Chen\nRidong:\n\n\tkernfs_remove_by_name_ns\tkernfs_get_active // active=1\n\t__kernfs_remove\t\t\t\t\t  // active=0x80000002\n\tkernfs_drain\t\t\t...\n\twait_event\n\t//waiting (active == 0x80000001)\n\t\t\t\t\tkernfs_break_active_protection\n\t\t\t\t\t// active = 0x80000001\n\t// continue\n\t\t\t\t\tkernfs_unbreak_active_protection\n\t\t\t\t\t// active = 0x80000002\n\t...\n\tkernfs_should_drain_open_files\n\t// warning occurs\n\t\t\t\t\tkernfs_put_active\n\nTo avoid the false positives (mind panic_on_warn) remove the check altogether.\n(This is meant as quick fix, I think active reference break/unbreak may be\nsimplified with larger rework.)","modified":"2026-04-16T04:42:23.509460390Z","published":"2025-07-10T07:42:00.395Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38282.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/071d8e4c2a3b0999a9b822e2eb8854784a350f8a"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2d6a67c2b3b87808a347dc1047b520a9dd177a4f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6c81f1c7812c61f187bed1b938f1d2e391d503ab"},{"type":"WEB","url":"https://git.kernel.org/stable/c/72275c888f8962b406ee9c6885c79bf68cca5a63"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/38xxx/CVE-2025-38282.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-38282"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"bdb2fd7fc56e197a63c0b0e7e07d25d5e20e7c72"},{"fixed":"2d6a67c2b3b87808a347dc1047b520a9dd177a4f"},{"fixed":"6c81f1c7812c61f187bed1b938f1d2e391d503ab"},{"fixed":"6bfb154f95d5f0ab7ed056f23aba8c1a94cb3927"},{"fixed":"72275c888f8962b406ee9c6885c79bf68cca5a63"},{"fixed":"071d8e4c2a3b0999a9b822e2eb8854784a350f8a"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-38282.json"}}],"schema_version":"1.7.5"}