Privilege escalation via unpinned PFNMAP pages
Published Oct 7, 2024 · Updated Oct 7, 2024
Use-after-free in Samsung Exynos 9820, 9825, 980, 990, 850, and W920 m2m scaler drivers allows local users to gain privileges. sysmmu_map_pte omits a page-reference increment for PFNMAP pages, so concurrent munmap releases physical pages while scaler I/O mappings still reference them. Successful exploitation requires precise timing during M2M1SHOT_IOC_PROCESS and permits privileged kernel page-table modification.
Summary
What happened
Use-after-free in Samsung Exynos 9820, 9825, 980, 990, 850, and W920 m2m scaler drivers allows local users to gain privileges. sysmmu_map_pte omits a page-reference increment for PFNMAP pages, so concurrent munmap releases physical pages while scaler I/O mappings still reference them. Successful exploitation requires precise timing during M2M1SHOT_IOC_PROCESS and permits privileged kernel page-table modification.
The record
- CVE
- CVE-2024-44068
- Published
- Oct 7, 2024
- Updated
- Oct 7, 2024
- Vendor
- Samsung Electronics
- Product
- Samsung Exynos 9820 Firmware
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Oct 7, 2024CVE publishedPublication date reported by the CVE source.
- Oct 7, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=0 <*
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
No public exploit references are available in this record.
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Reported exploitation
- Project Zero in-the-wild exploitation reportreported exploitation
- Exynos privilege-escalation exploit chainexploit chain
Technologies
Your stack
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Your stack
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