Local memory corruption via incorrect unmap index
Published Oct 7, 2025 · Updated Oct 7, 2025
Memory corruption in Linux kernel 6.2 allows local users to corrupt unmapped pages through iommufd device ioctls. The iommufd page-unpinning path calculates batch_last_index from the batch end instead of start_index, so unmapping runs beyond the requested page range and decrements references for pages that were never mapped. Reachability requires access to /dev/iommu or /dev/vfio/vfio and a map, access or copy, detach, and destroy sequence; the resulting corruption can trigger a kernel oops or panic.
Summary
What happened
Memory corruption in Linux kernel 6.2 allows local users to corrupt unmapped pages through iommufd device ioctls. The iommufd page-unpinning path calculates batch_last_index from the batch end instead of start_index, so unmapping runs beyond the requested page range and decrements references for pages that were never mapped. Reachability requires access to /dev/iommu or /dev/vfio/vfio and a map, access or copy, detach, and destroy sequence; the resulting corruption can trigger a kernel oops or panic.
The record
- CVE
- CVE-2023-53630
- Published
- Oct 7, 2025
- Updated
- Oct 7, 2025
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Oct 7, 2025CVE publishedPublication date reported by the CVE source.
- Oct 7, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.2
- Affected versionversion=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <70726ce4d898db57bfc4ae30ecd7da63b0dd0aa4
- Affected versionversion=8d160cd4d5066f864ec0f2c981470e55ac03ac27 <727c28c1cef2bc013d2c8bb6c50e410a3882a04e
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Technologies
Your stack
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Your stack
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