{"id":"CVE-2026-89447","summary":"iommufd: Avoid locking internal accesses during unmap","details":"In the Linux kernel, the following vulnerability has been resolved:\n\niommufd: Avoid locking internal accesses during unmap\n\niommufd_access_notify_unmap() skips internal accesses because they do\nnot have an external unmap callback to invoke.\n\nHowever, the current test calls iommufd_lock_obj() before checking\nwhether the access is internal. If iommufd_lock_obj() succeeds, the loop\nthen sees the internal access and continues, bypassing the matching\niommufd_put_object() used by the normal unmap path. This leaks the\nobject reference taken by iommufd_lock_obj().\n\nCheck for internal accesses first so skipped entries are never locked.","modified":"2026-09-13T03:47:18.000411103Z","published":"2026-09-11T19:43:14.094Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89447.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89447.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89447"},{"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":"27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0"},{"fixed":"436189ee4bb2c7c993b945d68570dd38c3e4349e"},{"fixed":"50a66a63d1c841ae6b28a4551f642c1bba4c9529"},{"fixed":"0dbcdf4473a614adbd732d567c9b39ac0e040e0c"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89447.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.17.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89447.json"}}],"schema_version":"1.9.0"}