{"id":"CVE-2026-89687","summary":"nfsd: ensure nfsd_file_do_acquire() does not use a non-opened file","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnfsd: ensure nfsd_file_do_acquire() does not use a non-opened file\n\n-\u003eatomic_open is permitted to return success without actually opening\nthe file.  It indicates this by calling finish_no_open().\nThis means dentry_create() can return a file which hasn't been opened.\nThis is extremely unlikely as -\u003eatomic_open handlers typically\nuse finish_no_open() only for already existing files, and dentry_create()\nisn't called in that case, and the parent being locked should prevent\nraces.\n\nHowever out of an abundance of caution it seems wise to teach nfsd to\nonly use the file returned by dentry_create() if FMODE_OPENED is set,\nindicating that it has in fact been opened.","modified":"2026-09-15T03:30:43.656177803Z","published":"2026-09-11T19:46:08.630Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89687.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/5859cc01fee06a2cd7458905a9593082fbab06e1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/a95a1cffacd0203100297001719160160f443dd6"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89687.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89687"},{"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":"64a989dbd144e0622371396461b11335459692d2"},{"fixed":"a95a1cffacd0203100297001719160160f443dd6"},{"fixed":"5859cc01fee06a2cd7458905a9593082fbab06e1"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89687.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"7.0.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89687.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}