CVE-2024-36912

Summary

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

Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl

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.

In order to make sure callers of vmbus_establish_gpadl() and vmbus_teardown_gpadl() don't return decrypted/shared pages to allocators, add a field in struct vmbus_gpadl to keep track of the decryption status of the buffers. This will allow the callers to know if they should free or leak the pages.

Affected Software

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

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

CVE Program Container

Additional References

• https://git.kernel.org/stable/c/1999644d95194d4a58d3e80ad04ce19220a01a81
• https://git.kernel.org/stable/c/8e62341f5c45b27519b7d193bcc32ada416ad9d8
• https://git.kernel.org/stable/c/bfae56be077ba14311509e70706a13458f87ea99
• https://git.kernel.org/stable/c/211f514ebf1ef5de37b1cf6df9d28a56cfd242ca

References

• https://git.kernel.org/stable/c/1999644d95194d4a58d3e80ad04ce19220a01a81
• https://git.kernel.org/stable/c/8e62341f5c45b27519b7d193bcc32ada416ad9d8
• https://git.kernel.org/stable/c/bfae56be077ba14311509e70706a13458f87ea99
• https://git.kernel.org/stable/c/211f514ebf1ef5de37b1cf6df9d28a56cfd242ca

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