CVE-2026-89447

Summary

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 Software

Weaknesses

References

• https://git.kernel.org/stable/c/436189ee4bb2c7c993b945d68570dd38c3e4349e
• https://git.kernel.org/stable/c/50a66a63d1c841ae6b28a4551f642c1bba4c9529
• https://git.kernel.org/stable/c/0dbcdf4473a614adbd732d567c9b39ac0e040e0c

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