Protected-memory modification via writable SVM remapping
Published Mar 8, 2023 · Updated Mar 4, 2025
Exposed SVM functionality in openEuler Kernel allows attackers to modify read-only memory through the driver's REMAP command. The command creates a writable alias for pages from a read-only mapping instead of preserving the source mapping's access protection. Access to the SVM device and its REMAP ioctl is required; successful exploitation permits modification of protected memory or file-backed content.
Summary
What happened
Exposed SVM functionality in openEuler Kernel allows attackers to modify read-only memory through the driver's REMAP command. The command creates a writable alias for pages from a read-only mapping instead of preserving the source mapping's access protection. Access to the SVM device and its REMAP ioctl is required; successful exploitation permits modification of protected memory or file-backed content.
The record
- CVE
- CVE-2021-33639
- Published
- Mar 8, 2023
- Updated
- Mar 4, 2025
- Vendor
- openEuler
- Product
- openEuler Kernel
- Classifications
- CWE-749, T1565.001
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Mar 8, 2023CVE publishedPublication date reported by the CVE source.
- Mar 4, 2025Record 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=<=4.19.90-2211.4.0.0177, <=5.10.0-60.67.0.92
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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