CVE-2026-52959
Description
A flaw was found in the Linux kernel's Secure Encrypted Virtualization (SEV) guest module. This vulnerability allows a malicious host to provide an invalid buffer size during an extended guest request. This incorrect handling of host-controlled page order during the cleanup process can lead to a mismatch between the allocated and freed buffer sizes, potentially resulting in corruption within the page allocator. This corruption could lead to system instability or a denial of service.
Understanding the Weakness (CWE)
Integrity,Availability,Confidentiality
Technical Impact: DoS: Crash, Exit, or Restart; Execute Unauthorized Code or Commands; Read Memory; Modify Memory
If the incorrect calculation is used in the context of memory allocation, then the software may create a buffer that is smaller or larger than expected. If the allocated buffer is smaller than expected, this could lead to an out-of-bounds read or write (CWE-119), possibly causing a crash, allowing arbitrary code execution, or exposing sensitive data.
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