CVE-2024-47727

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux31d58c4e557d46fa7f8557714250fb6f89c941ae < 25703a3c980e21548774eea8c8a87a75c5c8f58caffected
LinuxLinux31d58c4e557d46fa7f8557714250fb6f89c941ae < 4c0c5dcb5471de5fc8f0a1c4980e5815339e1ceeaffected
LinuxLinux31d58c4e557d46fa7f8557714250fb6f89c941ae < 18ecd5b74682839e7cdafb7cd1ec106df7baa18caffected
LinuxLinux31d58c4e557d46fa7f8557714250fb6f89c941ae < bca2e29f7e26ce7c3522f8b324c0bd85612f68e3affected
LinuxLinux31d58c4e557d46fa7f8557714250fb6f89c941ae < d4fc4d01471528da8a9797a065982e05090e1d81affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.1.113 <= 6.1.*unaffected
LinuxLinux6.6.54 <= 6.6.*unaffected
LinuxLinux6.10.13 <= 6.10.*unaffected
LinuxLinux6.11.2 <= 6.11.*unaffected
LinuxLinux6.12 <= *unaffected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References