Kernel code execution via NPU mapping use-after-free
Published Aug 2, 2021 · Updated Aug 3, 2024
Use-after-free in the NPU kernel driver in Huawei EMUI 11.0.0 allows attackers controlling hiaiserver to execute kernel code via partial unmaps. The npu_vm_close handler frees shared vm_private_data after a partial unmap splits a /dev/davinci0 mapping, leaving other regions with dangling pointers that can be freed again. SELinux restricts the device node to hiaiserver, so exploitation requires control of that process and can elevate execution into the kernel.
Summary
What happened
Use-after-free in the NPU kernel driver in Huawei EMUI 11.0.0 allows attackers controlling hiaiserver to execute kernel code via partial unmaps. The npu_vm_close handler frees shared vm_private_data after a partial unmap splits a /dev/davinci0 mapping, leaving other regions with dangling pointers that can be freed again. SELinux restricts the device node to hiaiserver, so exploitation requires control of that process and can elevate execution into the kernel.
The record
- CVE
- CVE-2021-22390
- Published
- Aug 2, 2021
- Updated
- Aug 3, 2024
- Vendor
- MindSpore
- Product
- EMUI
- Classifications
- CWE-119, T1068
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Aug 2, 2021CVE 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=11.0.0
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
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Huawei NPU kernel driver use-after-free technical demonstrationproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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