{"id":"CVE-2026-89447","title":"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 invo…","summary":"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 invo…","severity":"medium","vendor":"Linux","product":"Linux","affected":["Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 < 436189ee4bb2c7c993b945d68570dd38c3e4349e","Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 < 50a66a63d1c841ae6b28a4551f642c1bba4c9529","Linux >= 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 < 0dbcdf4473a614adbd732d567c9b39ac0e040e0c","Linux 6.17"],"published":"2026-09-11","updated":"2026-09-11","sourceUpdated":"2026-09-11T20:19:25.227","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-89447","references":[{"url":"https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89447.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-89447"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532181"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-89447"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89447"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89447.mbox"}],"tags":["nvd","cve.org","csaf","vex","red-hat"],"ingestedAt":"2026-09-14T12:19:18.969Z","epss":0.00176,"epssPercentile":0.07372,"cvss":4.4,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H","cvssSource":"vendor","cwe":["CWE-911"],"slug":"CVE-2026-89447","body":"## Overview\n\nIn 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89447.json)","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":24.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":204085,"id":"CVE-2026-89447","ts":1789490231373,"field":"cvss","old":null,"new":"4.4"},{"seq":204084,"id":"CVE-2026-89447","ts":1789490231373,"field":"severity","old":"none","new":"medium"},{"seq":147618,"id":"CVE-2026-89447","ts":1789270211617,"field":"cvss","old":null,"new":"4.4"},{"seq":147617,"id":"CVE-2026-89447","ts":1789270211617,"field":"severity","old":"none","new":"medium"},{"seq":109368,"id":"CVE-2026-89447","ts":1789183731638,"field":"cvss","old":null,"new":"4.4"},{"seq":109367,"id":"CVE-2026-89447","ts":1789183731638,"field":"severity","old":"none","new":"medium"}]}