Bugzilla – Bug 1225744
VUL-0: CVE-2024-36909: kernel: Drivers: hv: vmbus: Don't free ring buffers that couldn't be re-encrypted
Last modified: 2024-07-10 19:59:13 UTC
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. References: http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2024-36909 https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2024/CVE-2024-36909.mbox https://git.kernel.org/stable/c/2f622008bf784a9f5dd17baa19223cc2ac30a039 https://git.kernel.org/stable/c/82f9e213b124a7d2bb5b16ea35d570260ef467e0 https://git.kernel.org/stable/c/a9212a4e2963a7fbe3864ba33dc551d4ad8d0abb https://git.kernel.org/stable/c/30d18df6567be09c1433e81993e35e3da573ac48 https://www.cve.org/CVERecord?id=CVE-2024-36909
fixes submitted to for-next.
security-team@suse.de