Riskcovery

CVE-2024-47727

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

State
Published
Severity
7.8 High
Published
Oct 21, 2024
Updated
Aug 5, 2026
Reserved
Sep 30, 2024

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
3.17.8 HighCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HLinux

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 31d58c4e557d46fa7f8557714250fb6f89c941ae to before 25703a3c980e21548774eea8c8a87a75c5c8f58cAffected
  • 31d58c4e557d46fa7f8557714250fb6f89c941ae to before 4c0c5dcb5471de5fc8f0a1c4980e5815339e1ceeAffected
  • 31d58c4e557d46fa7f8557714250fb6f89c941ae to before 18ecd5b74682839e7cdafb7cd1ec106df7baa18cAffected
  • 31d58c4e557d46fa7f8557714250fb6f89c941ae to before bca2e29f7e26ce7c3522f8b324c0bd85612f68e3Affected
  • 31d58c4e557d46fa7f8557714250fb6f89c941ae to before d4fc4d01471528da8a9797a065982e05090e1d81Affected
LinuxLinux
  • 5.19Affected
  • before 5.19Not affected
  • 6.1.113 through 6.1.*Not affected
  • 6.6.54 through 6.6.*Not affected
  • 6.10.13 through 6.10.*Not affected
  • 6.11.2 through 6.11.*Not affected
  • 6.12 and laterNot affected

References

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