# CVE-2026-89447

## Summary

- **CVE ID:** CVE-2026-89447
- **Severity:** UNKNOWN
- **CVSS Score:** 1.51
- **CWE:** N/A
- **Published:** Sep 11, 2026
- **Last Modified:** Sep 16, 2026

## Description

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.

## Affected Products

- Linux — Linux (27b77ea5feaa8fcf385ea99ce757982b0ac9d1f0)
- Linux — Linux (6.17)
- Linux — Linux (0)
- Linux — Linux (6.18.50)
- Linux — Linux (7.2.4)
- Linux — Linux (7.3-rc1)

## References

- [CNA](https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e)
- [CNA](https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529)
- [CNA](https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.18%
- **EPSS Percentile:** 7.4

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._