CVE-2026-89447iommufd: Avoid locking internal accesses during unmap
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: iommufd: Avoid locking internal accesses during unmap iommufd_access_notify_unmap() skips internal accesses because they do not have an external unmap callback to invoke. However, the current test calls iommufd_lock_obj() before checking whether the access is internal. If iommufd_lock_obj() succeeds, the loop then sees the internal access and continues, bypassing the matching iommufd_put_object() used by the normal unmap path. This leaks the object reference taken by iommufd_lock_obj(). Check for internal accesses first so skipped entries are never locked.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 11, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 before 436189ee4bb2c7c993b945d68570dd38c3e4349e; from 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 before 50a66a63d1c841ae6b28a4551f642c1bba4c9529; 27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0 builds before 0dbcdf4473a614adbd732d567c9b39ac0e040e0c | CNA record |
References
- https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e
- https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529
- https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.