Local data disclosure via incoherent GPU reads
Published Jun 8, 2026 · Updated Jun 8, 2026
Information disclosure in Linux Kernel 6.18 allows local users to read stale data from freed pages through Intel Xe iGPU memory advice. xe_vm_madvise_ioctl() accepts XE_COH_NONE PAT indices for CPU-cached buffers, letting the GPU bypass dirty CPU cache lines and read uncleared DRAM. Exploitation requires local low-privileged access and the affected integrated-GPU path; the demonstrated consequence is disclosure of data previously held by other processes.
Summary
What happened
Information disclosure in Linux Kernel 6.18 allows local users to read stale data from freed pages through Intel Xe iGPU memory advice. xe_vm_madvise_ioctl() accepts XE_COH_NONE PAT indices for CPU-cached buffers, letting the GPU bypass dirty CPU cache lines and read uncleared DRAM. Exploitation requires local low-privileged access and the affected integrated-GPU path; the demonstrated consequence is disclosure of data previously held by other processes.
The record
- CVE
- CVE-2026-46309
- Published
- Jun 8, 2026
- Updated
- Jun 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- CWE-401, CWE-524, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 8, 2026CVE publishedPublication date reported by the CVE source.
- Jun 8, 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=6.18
- Affected versionversion=ada7486c5668db542a7d361268df931aca5b726a <4e5591c2fc1b30f4ea5e2eab4c3a695acc404e39
- Affected versionversion=ada7486c5668db542a7d361268df931aca5b726a <87f9b1528e1ffc1da3615d552c9a06aba5e20b00
- Affected versionversion=ada7486c5668db542a7d361268df931aca5b726a <fea04cf6f2345bc50f15b6638906c35962b89424
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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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