Vulnerability CVE-2024-36910
Published: 2024-05-30

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

uio_hv_generic: Don't free decrypted memory

In CoCo VMs it is possible for the untrusted host to cause
set_memory_encrypted() or 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.

The VMBus device UIO driver could free decrypted/shared pages if
set_memory_decrypted() fails. Check the decrypted field in the gpadl
to decide whether to free the memory.

 References:
https://git.kernel.org/stable/c/dabf12bf994318d939f70d47cfda30e47abb2c54
https://git.kernel.org/stable/c/6466a0f6d235c8a18c602cb587160d7e49876db9
https://git.kernel.org/stable/c/fe2c58602354fbd60680dc42ac3a0b772cda7d23
https://git.kernel.org/stable/c/3d788b2fbe6a1a1a9e3db09742b90809d51638b7
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