CVE-2024-36909 Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted

What is CVE-2024-36909?

CVE-2024-36909 is a critical vulnerability in Linux kernel, published on 30 May 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

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

Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted

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 ring buffer code could free decrypted/shared pages if set_memory_decrypted() fails. Check the decrypted field in the struct vmbus_gpadl for the ring buffers to decide whether to free the memory.

Weakness: CWE-401

Which versions are affected by CVE-2024-36909?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-36909?

Apply the vendor's patch.

Is CVE-2024-36909 being exploited?

There is no known exploitation of CVE-2024-36909 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• How this page is made

Also known as AZL-67991, BELL-CVE-2024-36909, DEBIAN-CVE-2024-36909, ROOT-OS-DEBIAN-11-CVE-2024-36909, ROOT-OS-UBUNTU-2204-CVE-2024-36909, UBUNTU-CVE-2024-36909.