Vulnerability · CVE-2025-39966
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix race during abort for file descriptors fput() doesn't actually call file_operations release() synch
Published Oct 15, 2025 · catalog updated Aug 5, 2026 · Linux Linux
Check this week
CVE-2025-39966 is not in CISA KEV. FIRST estimates a 11.00% chance of exploitation in the next 30 days. Check whether you run Linux Linux.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.8
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 11.00%
- Remediation
- Version ranges on file
- Affected products
- vendor Linux Linux 07838f7fd529c8a6de44b601d4b7057e6c8d36ed <4e034bf045b12852a24d5d33f2451850818ba0c1
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix race during abort for file descriptors fput() doesn't actually call file_operations release() synchronously, it puts the file on a work queue and it will be released eventually. This is normally fine, except for iommufd the file and the iommufd_object are tied to gether. The file has the object as it's private_data and holds a users refcount, while the object is expected to remain alive as long as the file is. When the allocation of a new object aborts before installing the file it will fput() the file and then go
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- vendor Linux Linux 07838f7fd529c8a6de44b601d4b7057e6c8d36ed <4e034bf045b12852a24d5d33f2451850818ba0c107838f7fd529c8a6de44b601d4b7057e6c8d36ed <4e034bf045b12852a24d5d33f2451850818ba0c1
How to fix CVE-2025-39966
Recommended remediation
Affected version ranges suggest a fixed boundary. Verify against the vendor advisory for your release.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
CVE-2025-39966 is not in CISA KEV. FIRST estimates a 11.00% chance of exploitation in the next 30 days. Check whether you run Linux Linux.
Which versions are affected?
Compare what you have installed with Linux Linux 07838f7fd529c8a6de44b601d4b7057e6c8d36ed <4e034bf045b12852a24d5d33f2451850818ba0c1 07838f7fd529c8a6de44b601d4b7057e6c8d36ed <4e034bf045b12852a24d5d33f2451850818ba0c1. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
No weakness class is stored. EPSS 11.00%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
Timeline
Detection, updates, and resolution for this record.
Oct 15, 2025 · EUVD
Detected
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix race during abort for file descriptors fput() doesn't actually call file_operations release() synchronously, it puts the file on a work queue and it will be released eventually. This is normally fine, except for iommufd the file and the iommufd_object are tied to gether. The file has the object as it's private_data an
Aug 5, 2026 · EUVD
Updated
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix race during abort for file descriptors fput() doesn't actually call file_operations release() synchronously, it puts the file on a work queue and it will be released eventually. This is normally fine, except for iommufd the file and the iommufd_object are tied to gether. The file has the object as it's private_data an
Sources
- EUVDVulnerability recordEUVD-2025-34606
In the Linux kernel, the following vulnerability has been resolved: iommufd: Fix race during abort for file descriptors fput() doesn't actually call file_operations release() synchronously, it puts the file on a work queue and it will be released eventually. This is normally fine
euvd.enisa.europa.eu
References
Freshness
Last verified in this catalog Aug 5, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.