Kernel-data disclosure via unbounded CRIU checkpoint copy
Published Aug 12, 2026 · Updated Aug 12, 2026
Out-of-bounds read in Linux before 7.1.6 allows local users to disclose kernel data through an AMD KFD CRIU checkpoint. The v9 MQD checkpoint path trusts cp_hqd_cntl_stack_size from hardware and passes it to memcpy without limiting the copy to the control-stack buffer-object allocation. Access requires a local user able to invoke KFD CRIU checkpointing on affected AMD GPU hardware; the over-read can expose adjacent GTT kernel memory to userspace.
Summary
What happened
Out-of-bounds read in Linux before 7.1.6 allows local users to disclose kernel data through an AMD KFD CRIU checkpoint. The v9 MQD checkpoint path trusts cp_hqd_cntl_stack_size from hardware and passes it to memcpy without limiting the copy to the control-stack buffer-object allocation. Access requires a local user able to invoke KFD CRIU checkpointing on affected AMD GPU hardware; the over-read can expose adjacent GTT kernel memory to userspace.
The record
- CVE
- CVE-2026-68447
- Published
- Aug 12, 2026
- Updated
- Aug 12, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-125, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 12, 2026CVE publishedPublication date reported by the CVE source.
- Aug 12, 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=0 <7.1.6
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <426ffae6ecc7ec77d32bf8be065c21a1b881b084
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a0d87beb2660a5098b2b0ecdc1e96810a9074ea9
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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