CVE-2024-36913
CriticalCVSS 9.3Exploitation Probability (EPSS)
Elevated risk57th percentile - higher than 57% of all known CVEs
Summary
In the Linux kernel, a vulnerability in the vmbus driver was fixed where in CoCo VMs, a failed set_memory_encrypted() or set_memory_decrypted() call could lead to freeing decrypted (shared) memory pages. The fix leaks the pages in such cases to avoid potential functional or security issues.
Risk Assessment
Risk of data confidentiality or integrity compromise in Hyper-V environments with CoCo VMs if memory pages are returned to the allocator in an incorrect state.
Recommendation
Update the Linux kernel to a patched version and verify virtualization environment configurations.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Drivers: hv: vmbus: Leak pages if set_memory_encrypted() fails 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. VMBus code could free decrypted pages if set_memory_encrypted()/decrypted() fails. Leak the pages if this happens.