Local privilege escalation via freed folio reuse
Published Jun 8, 2026 · Updated Jun 8, 2026
Use-after-free in Linux Kernel 6.19 through 7.0.3 allows local users to gain kernel privileges by racing device-private GPU memory migration. free_zone_device_folio() calls the driver's folio_free() callback and then rereads folio->pgmap after the driver reallocates the folio with a different order. Exploitation requires an unprivileged local account with GPU render-node access and concurrent migration and allocation activity; successful reuse enables kernel memory disclosure, corruption, crash, or privilege escalation.
Summary
What happened
Use-after-free in Linux Kernel 6.19 through 7.0.3 allows local users to gain kernel privileges by racing device-private GPU memory migration. free_zone_device_folio() calls the driver's folio_free() callback and then rereads folio->pgmap after the driver reallocates the folio with a different order. Exploitation requires an unprivileged local account with GPU render-node access and concurrent migration and allocation activity; successful reuse enables kernel memory disclosure, corruption, crash, or privilege escalation.
The record
- CVE
- CVE-2026-46277
- Published
- Jun 8, 2026
- Updated
- Jun 8, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1068
- 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
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Is a vulnerable build present?
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- Affected versionversion=6.19
- Affected versionversion=d245f9b4ab806733a77e51a218ca7b8bc3135cd9 <39928984956037cabd304321cb8f342e47421db5
- Affected versionversion=d245f9b4ab806733a77e51a218ca7b8bc3135cd9 <85be0a262e39c706edb53c88af8afde2e98222ba
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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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