Kernel memory overwrite via unchecked remap_pfn_range bounds
Published Jul 13, 2022 · Updated Aug 3, 2024
Out-of-bounds memory mapping in Google Cloud Android SoC kernels allows attackers to expose writable kernel memory through a userspace request. The remap_pfn_range path fails to constrain the requested mapping to valid memory, while userspace also controls vma->vm_page_prot. Reachability requires access to that kernel interface; a successful request can map kernel memory writable and permit direct modification of it.
Summary
What happened
Out-of-bounds memory mapping in Google Cloud Android SoC kernels allows attackers to expose writable kernel memory through a userspace request. The remap_pfn_range path fails to constrain the requested mapping to valid memory, while userspace also controls vma->vm_page_prot. Reachability requires access to that kernel interface; a successful request can map kernel memory writable and permit direct modification of it.
The record
- CVE
- CVE-2022-20238
- Published
- Jul 13, 2022
- Updated
- Aug 3, 2024
- Vendor
- Google Cloud
- Product
- Android
- Classifications
- CWE-119, T1068
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Jul 13, 2022CVE publishedPublication date reported by the CVE source.
- Aug 3, 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=Android SoC
What conditions does exploitation require?
What is affected?
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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