---
cve: "CVE-2026-89447"
severity: "LOW"
cvss: 3.1
epss: "0.2%"
vendor: "Linux"
kev: false
exploited: false
published: "2026-09-11 20:19:25"
tags: [cve, security, low]
source: tsecurity.de CVE-Dossier
exported: "2026-09-20T19:54:46+02:00"
---

# CVE-2026-89447

> 3.1 LOW

## Beschreibung

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.

## Patch verfügbar (OSV)

- Kernel ≥ 6.18.50
- Kernel ≥ 7.2.4

## Referenzen

- <https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e>
- <https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529>
- <https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-89447) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_