Kernel-memory disclosure via uninitialized structure padding
Published Sep 18, 2023 · Updated Sep 25, 2024
Information disclosure in the Linux kernel before 5.8.6 allows local users to read one byte of kernel memory through a CEC ioctl. In cec_adap_g_log_addrs(), direct structure assignment leaves a padding byte uninitialized before copy_to_user() returns the structure. Exploitation requires local access to a CEC device on specific hardware; the disclosed byte cannot alter kernel state or interrupt service.
Summary
What happened
Information disclosure in the Linux kernel before 5.8.6 allows local users to read one byte of kernel memory through a CEC ioctl. In cec_adap_g_log_addrs(), direct structure assignment leaves a padding byte uninitialized before copy_to_user() returns the structure. Exploitation requires local access to a CEC device on specific hardware; the disclosed byte cannot alter kernel state or interrupt service.
The record
- CVE
- CVE-2020-36766
- Published
- Sep 18, 2023
- Updated
- Sep 25, 2024
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Sep 18, 2023CVE publishedPublication date reported by the CVE source.
- Sep 25, 2024Record updatedLatest update available in the CVE record.
Exploitability
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What is affected?
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Published CVSS scores
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Attacks
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Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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