Local privilege escalation via stale AMDGPU page mappings
Published Jul 19, 2026 · Updated Jul 19, 2026
Use-after-free in the AMDGPU HMM page walker in Linux Kernel 6.2 through 7.0.11 allows local users to escalate privileges via GPU ioctls. amdgpu_hmm_range_get_pages rereads the MMU-notifier sequence across large chunks, allowing validation to accept page references collected before a concurrent unmap or remap invalidated them. Access to an AMDGPU render node or /dev/kfd, a mapping larger than 2 GB, and an attacker-driven address-space race enable stale-page DMA reads or writes, memory corruption, or a kernel panic.
Summary
What happened
Use-after-free in the AMDGPU HMM page walker in Linux Kernel 6.2 through 7.0.11 allows local users to escalate privileges via GPU ioctls. amdgpu_hmm_range_get_pages rereads the MMU-notifier sequence across large chunks, allowing validation to accept page references collected before a concurrent unmap or remap invalidated them. Access to an AMDGPU render node or /dev/kfd, a mapping larger than 2 GB, and an attacker-driven address-space race enable stale-page DMA reads or writes, memory corruption, or a kernel panic.
The record
- CVE
- CVE-2026-63879
- Published
- Jul 19, 2026
- Updated
- Jul 19, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- Attack vector
- local
- Privileges
- authenticated
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=0 <7.0.12
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2fd24407457a6b181ba827705678da70e528dcd0
- Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <962d684b5dc0741dcd93485d41b450de402d5592
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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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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