Kernel memory corruption via malformed QAIC control messages
Published Oct 1, 2025 · Updated Aug 5, 2026
Memory corruption in Linux 6.4 through 6.4.6 allows attackers to corrupt kernel heap memory via malformed QAIC control messages. The decode_message() parser trusts device-supplied transaction lengths; a length below the header size underflows a memcpy size, while unchecked aggregate lengths permit out-of-bounds reads and writes. Reachability requires an attached AIC100-class accelerator with malicious or compromised firmware, or an unprivileged local user able to access its control device; consequences include kernel-memory disclosure, corruption, and panic.
Summary
What happened
Memory corruption in Linux 6.4 through 6.4.6 allows attackers to corrupt kernel heap memory via malformed QAIC control messages. The decode_message() parser trusts device-supplied transaction lengths; a length below the header size underflows a memcpy size, while unchecked aggregate lengths permit out-of-bounds reads and writes. Reachability requires an attached AIC100-class accelerator with malicious or compromised firmware, or an unprivileged local user able to access its control device; consequences include kernel-memory disclosure, corruption, and panic.
The record
- CVE
- CVE-2023-53493
- Published
- Oct 1, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- T1068
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Oct 1, 2025CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record 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=129776ac2e38231fa9c02ce20e116c99de291666 <51b56382ed2a2b03347372272362b3baa623ed1e
- Affected versionversion=129776ac2e38231fa9c02ce20e116c99de291666 <57d14cb3bae4619ce2fb5235cb318c3d5d8f53fd
- Affected versionversion=6.4
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
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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