Latent out-of-bounds read via signed offset conversion
Published Jul 19, 2026 · Updated Jul 19, 2026
Integer conversion in Linux Kernel 6.17 through 6.18.33 and 6.19 through 7.0.10 allows local users to create a latent out-of-bounds read. iommu_mmio_write() and iommu_capability_write() parse unsigned input into signed int offsets, causing sufficiently large values to become negative. AMD IOMMU debugfs is root-only by default, while input-length, type-promotion, and show-handler checks prevent the invalid offset from reaching a read.
Summary
What happened
Integer conversion in Linux Kernel 6.17 through 6.18.33 and 6.19 through 7.0.10 allows local users to create a latent out-of-bounds read. iommu_mmio_write() and iommu_capability_write() parse unsigned input into signed int offsets, causing sufficiently large values to become negative. AMD IOMMU debugfs is root-only by default, while input-length, type-promotion, and show-handler checks prevent the invalid offset from reaching a read.
The record
- CVE
- CVE-2026-64186
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-125
- Attack vector
- local
- Privileges
- admin
Timeline
How it unfolded
- Jul 19, 2026CVE publishedPublication date reported by the CVE source.
- Jul 19, 2026Record 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=6.17
- Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <488d2c76bd9f78433a70690d1054bfae3d39a407
- Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <62f9dfbf1aceae88b03c5ca08f7d36e943939dec
- Affected versionversion=7a4ee419e8c144b747a8915856e91a034d7c8f34 <8dfd3d8d74435344ee8dc9237596959c8b2a6cbe
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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