Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a… (CVE-2026-64290)
In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.
AI Analysis
Technical Summary
The Linux kernel's iommufd_fault_fops_read() function contained a flaw where a failure in copy_to_user() inside an inner loop only broke that inner loop, but the outer while loop would re-fetch the fault group and retry the failing operation indefinitely. This caused the reader process to spin at 100% CPU while holding a mutex, effectively causing a denial of service. The fix involves checking the return code after the inner loop and breaking the outer loop to stop the infinite retry.
Potential Impact
This vulnerability leads to a denial of service by causing a process to spin indefinitely at 100% CPU usage while holding a mutex, potentially impacting system responsiveness and availability. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links or official advisories are provided, users should monitor vendor channels for updates addressing this issue.
Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a… (CVE-2026-64290)
Description
In the Linux kernel, the following vulnerability has been resolved: iommufd: Break the loop on failure in iommufd_fault_fops_read() On a copy_to_user() failure inside the inner list_for_each_entry, only the inner loop breaks; the outer while re-fetches the just-restored fault group and retries the failing copy_to_user() forever, spinning the reader at 100% CPU with fault->mutex held. Check rc after the inner loop and break the outer while as well.
CVSS v3.1
Score 5.5medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's iommufd_fault_fops_read() function contained a flaw where a failure in copy_to_user() inside an inner loop only broke that inner loop, but the outer while loop would re-fetch the fault group and retry the failing operation indefinitely. This caused the reader process to spin at 100% CPU while holding a mutex, effectively causing a denial of service. The fix involves checking the return code after the inner loop and breaking the outer loop to stop the infinite retry.
Potential Impact
This vulnerability leads to a denial of service by causing a process to spin indefinitely at 100% CPU usage while holding a mutex, potentially impacting system responsiveness and availability. There is no impact on confidentiality or integrity reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since no patch links or official advisories are provided, users should monitor vendor channels for updates addressing this issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-vx5q-9x62-9qqg
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64290"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a65420e9c2644c7f8086053
Added to database: 07/25/2026, 23:09:02 UTC
Last enriched: 08/15/2026, 03:14:25 UTC
Last updated: 09/08/2026, 22:52:14 UTC
Views: 76
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