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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
31d58c4e557d46fa7f8557714250fb6f89c941ae to < 25703a3c980e21548774eea8c8a87a75c5c8f58caffected31d58c4e557d46fa7f8557714250fb6f89c941ae to < 4c0c5dcb5471de5fc8f0a1c4980e5815339e1ceeaffected31d58c4e557d46fa7f8557714250fb6f89c941ae to < 18ecd5b74682839e7cdafb7cd1ec106df7baa18caffected31d58c4e557d46fa7f8557714250fb6f89c941ae to < bca2e29f7e26ce7c3522f8b324c0bd85612f68e3affected31d58c4e557d46fa7f8557714250fb6f89c941ae to < d4fc4d01471528da8a9797a065982e05090e1d81affected
Linux Linux
Default version status: affected
5.19affected0 to < 5.19unaffected6.1.113 to ≤ 6.1.*unaffected6.6.54 to ≤ 6.6.*unaffected6.10.13 to ≤ 6.10.*unaffected6.11.2 to ≤ 6.11.*unaffected6.12 to ≤ *unaffected
References
- 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 ↗
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html ↗