CVE-2024-57793

In the Linux kernel, the following vulnerability has been resolved:

virt: tdx-guest: Just leak decrypted memory on unrecoverable errors

In CoCo VMs it is possible for the untrusted host to cause set_memory_decrypted() to fail such that an error is returned and the resulting memory is shared. Callers need to take care to handle these errors to avoid returning decrypted (shared) memory to the page allocator, which could lead to functional or security issues.

Leak the decrypted memory when set_memory_decrypted() fails, and don't need to print an error since set_memory_decrypted() will call WARN_ONCE().

This vulnerability is rated as Moderate impact for Red Hat Enterprise Linux because exploitation requires a specialized Confidential Computing deployment running as an Intel TDX guest on an untrusted hypervisor. Standard bare-metal systems, container hosts, and virtual machines not operating under Intel Trust Domain Extensions are unaffected by this flaw. Within TDX guests, hypervisor-induced failures during memory decryption could leave unencrypted memory exposed to the page allocator, potentially compromising guest confidentiality or causing system instability.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.