CVE-2026-31588 - Vulnerability Analysis

Overview

Linux kernel KVM x86 contains a use-after-free vulnerability caused by referencing on-stack variables during split MMIO writes across page boundaries, letting attackers cause memory corruption, exploit requires MMIO page split with on-stack source variable.

Severity & Score

Impact

Attackers can cause use-after-free memory corruption, potentially leading to system instability or arbitrary code execution.

Mitigation

Update to the latest Linux kernel version containing the KVM fix for MMIO fragment scratch field usage.

References

• https://git.kernel.org/stable/c/b5a02d37eb0739f462fa12df449ab9b3480c783b
• https://git.kernel.org/stable/c/0b16e69d17d8c35c5c9d5918bf596c75a44655d3
• https://git.kernel.org/stable/c/dc6a6c3db3a4eca7e747cfc46e22c08d016c68f7
• https://git.kernel.org/stable/c/22d2ff69d487a32a8b88f9c970120fc2daa08a77
• https://git.kernel.org/stable/c/2b83d91e9ae92fe1258d7040a32430bbb3bb7d6e
• https://git.kernel.org/stable/c/3a7b6d75c8f85b09dea893f64a85a356bcf6c3fe

Related Resources

• Vulnerability Intelligence Dashboard
• Credential Scanner