CVE-2024-47727 Information

Description

In the Linux kernel the following vulnerability has been resolved:

x86/tdx: Fix \in-kernel MMIO\ check

TDX only supports kernel-initiated MMIO operations. The handle_mmio() function checks if the VE exception occurred in the kernel and rejects the operation if it did not.

However userspace can deceive the kernel into performing MMIO on its behalf. For example if userspace can point a syscall to an MMIO address syscall does get_user() or put_user() on it triggering MMIO VE. The kernel will treat the VE as in-kernel MMIO.

Ensure that the target MMIO address is within the kernel before decoding instruction.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Reference

https://git.kernel.org/stable/c/25703a3c980e21548774eea8c8a87a75c5c8f58c https://git.kernel.org/stable/c/4c0c5dcb5471de5fc8f0a1c4980e5815339e1cee https://git.kernel.org/stable/c/18ecd5b74682839e7cdafb7cd1ec106df7baa18c https://git.kernel.org/stable/c/bca2e29f7e26ce7c3522f8b324c0bd85612f68e3 https://git.kernel.org/stable/c/d4fc4d01471528da8a9797a065982e05090e1d81

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8