Low [CVE-2026-52959] Do not use host-controlled page order in cleanup path

In the Linux kernel, the following vulnerability has been resolved: virt: sev-guest: Do not use host-controlled page order in cleanup path When issuing an extended guest request (SVM_VMGEXIT_EXT_GUEST_REQUEST), get_ext_report() allocates a buffer to retrieve a certificate blob from the host, keeping track of its size in report_req->certs_len.

However, the host may return SNP_GUEST_VMM_ERR_INVALID_LEN, indicating an invalid buffer size, as well as the expected length of such buffer. get_ext_report() subsequently updates report_req->certs_len with the host-controlled value, and cleans up the buffer by computing a page order from such value.

This is incorrect, as the host-provided length may not match the page order of the original allocation, potentially resulting in corruption in the page allocator. Fix this by using alloc_pages_exact() instead, and reusing @npages to compute the size passed to free_pages_exact().

For consistency, also use @npages to compute the size when allocating the pages, even though this last change has no functional effect. A flaw was found in the Linux kernel's Secure Encrypted Virtualization (SEV) guest module.

This incorrect handling of host-controlled page order during the cleanup process can lead to a mismatch between the allocated and freed buffer sizes, potentially resulting in corruption within the page allocator.