Guest compromise via recycled shared TDX memory
Published Jan 11, 2025 · Updated Aug 5, 2026
Memory isolation failure in Linux kernel 6.7 through 6.12.7 allows attackers to compromise CoCo guests through TDX quote requests. The alloc_quote_buf() error path frees pages that remain decrypted and shared after set_memory_decrypted() fails, allowing later allocator reuse. An attacker must control the host of a TDX confidential VM and provoke the conversion failure; reused pages can expose or corrupt guest data and disrupt the guest.
Summary
What happened
Memory isolation failure in Linux kernel 6.7 through 6.12.7 allows attackers to compromise CoCo guests through TDX quote requests. The alloc_quote_buf() error path frees pages that remain decrypted and shared after set_memory_decrypted() fails, allowing later allocator reuse. An attacker must control the host of a TDX confidential VM and provoke the conversion failure; reused pages can expose or corrupt guest data and disrupt the guest.
The record
- CVE
- CVE-2024-57793
- Published
- Jan 11, 2025
- Updated
- Aug 5, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- Unavailable
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jan 11, 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=6.7
- Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <1429ae7b7d4759a1e362456b8911c701bae655b4
- Affected versionversion=f4738f56d1dc62aaba69b33702a5ab098f1b8c63 <27834971f616c5e154423c578fa95e0444444ce1
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
No sourced classifications are available.
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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