{"id":"CVE-2026-74487","summary":"binfmt_misc: restore write access when removing an entry","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbinfmt_misc: restore write access when removing an entry\n\nRegistering an entry with the MISC_FMT_OPEN_FILE flag opens the\ninterpreter via open_exec() which denies write access to it for as\nlong as the entry exists. Removing the entry closes the interpreter\nfile via filp_close() but never restores write access, leaving the\ninode's i_writecount permanently negative. Opening the interpreter\nfor writing keeps failing with ETXTBSY long after the entry is gone\nuntil the inode is evicted from the inode cache.\n\nCommit 90f601b497d7 (\"binfmt_misc: restore write access before\nclosing files opened by open_exec()\") fixed the same imbalance in the\nerror path of bm_register_write() but the actual removal path has\nbeen leaking the write denial since the introduction of the flag.\n\nRestore write access in put_binfmt_handler() before closing the\ninterpreter file.","modified":"2026-08-17T03:47:34.709212288Z","published":"2026-08-15T12:27:18.236Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74487.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3b522487a3a9162b1b519eefde7998d103e3e07b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/db1856ea9196cf6e015d12199a34c0b9313c7bfa"},{"type":"WEB","url":"https://git.kernel.org/stable/c/fdc1d702bf3001586221fa07e598e876a0a854c5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/74xxx/CVE-2026-74487.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-74487"},{"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":"948b701a607f123df92ed29084413e5dd8cda2ed"},{"fixed":"fdc1d702bf3001586221fa07e598e876a0a854c5"},{"fixed":"3b522487a3a9162b1b519eefde7998d103e3e07b"},{"fixed":"db1856ea9196cf6e015d12199a34c0b9313c7bfa"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74487.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"4.8.0"},{"fixed":"6.18.44"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-74487.json"}}],"schema_version":"1.9.0"}