In the Linux kernel, the following vulnerability has been resolved: iommufd: Avoid locking internal accesses during unmap… (CVE-2026-89447)
A vulnerability in the Linux kernel's iommufd component was resolved that involved improper handling of internal accesses during unmap operations. The flaw caused a reference leak due to locking internal accesses that should have been skipped, potentially leading to resource management issues.
AI Analysis
Technical Summary
The Linux kernel vulnerability (CVE-2026-89447) in the iommufd subsystem involved the function iommufd_access_notify_unmap() improperly locking internal accesses during unmap. The function called iommufd_lock_obj() before checking if the access was internal, causing the loop to bypass the matching iommufd_put_object() call and leak the object reference. The fix ensures internal accesses are checked first and skipped, preventing the locking and reference leak.
Potential Impact
The vulnerability causes a leak of object references within the iommufd subsystem, which may lead to resource exhaustion or instability in the kernel due to unreleased references. There is no indication of direct code execution or privilege escalation from the provided data.
Mitigation Recommendations
A fix has been applied to the Linux kernel to correct the locking logic in iommufd_access_notify_unmap(). Users should update to the fixed kernel version once available. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: iommufd: Avoid locking internal accesses during unmap… (CVE-2026-89447)
Description
A vulnerability in the Linux kernel's iommufd component was resolved that involved improper handling of internal accesses during unmap operations. The flaw caused a reference leak due to locking internal accesses that should have been skipped, potentially leading to resource management issues.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability (CVE-2026-89447) in the iommufd subsystem involved the function iommufd_access_notify_unmap() improperly locking internal accesses during unmap. The function called iommufd_lock_obj() before checking if the access was internal, causing the loop to bypass the matching iommufd_put_object() call and leak the object reference. The fix ensures internal accesses are checked first and skipped, preventing the locking and reference leak.
Potential Impact
The vulnerability causes a leak of object references within the iommufd subsystem, which may lead to resource exhaustion or instability in the kernel due to unreleased references. There is no indication of direct code execution or privilege escalation from the provided data.
Mitigation Recommendations
A fix has been applied to the Linux kernel to correct the locking logic in iommufd_access_notify_unmap(). Users should update to the fixed kernel version once available. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-jq6v-47fj-pp2p
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89447"]
Threat ID: 6aa4a02355bf5e2cf5a869aa
Added to database: 09/12/2026, 00:43:15 UTC
Last enriched: 09/12/2026, 01:16:55 UTC
Last updated: 09/12/2026, 01:16:55 UTC
Views: 2
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