CVE-2024-36912: Drivers: hv: vmbus: Track decrypted status in vmbus_gpadl
In the Linux kernel, the following vulnerability has been resolved:
Drivers: hv: vmbus: Track decrypted status in vmbusgpadl
In CoCo VMs it is possible for the untrusted host to cause setmemoryencrypted() or setmemorydecrypted() 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 vmbusestablishgpadl() and vmbusteardowngpadl() don't return decrypted/shared pages to allocators, add a field in struct vmbusgpadl 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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
debian/linuxto a version that resolves this vulnerability.Fixed in 5.10.223-1Fixed in 5.10.234-1Fixed in 6.1.129-1Fixed in 6.1.135-1Fixed in 6.12.25-1Fixed in 6.12.27-1
Event History
Frequently Asked Questions
What is the severity of CVE-2024-36912?
CVE-2024-36912 has been classified as a medium severity vulnerability affecting the Linux kernel.
How do I fix CVE-2024-36912?
To fix CVE-2024-36912, update to Linux kernel versions 6.1.123-1, 6.1.119-1, 6.12.10-1, or 6.12.11-1.
Which Linux kernel versions are affected by CVE-2024-36912?
CVE-2024-36912 affects Linux kernel versions up to and including 5.10.226-1.
What component of the Linux kernel is impacted by CVE-2024-36912?
CVE-2024-36912 affects the Hyper-V vmbus driver in the Linux kernel.
Can CVE-2024-36912 be exploited remotely?
CVE-2024-36912 can potentially be exploited by an untrusted host in a CoCo VM environment.