CVE-2024-57843

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 6.6.74

Description The issue is related to an overflow inside virtnet rq alloc in the virtio-net component. This occurs when a frag just got a page and the sysctl net.core.high order alloc disable value is 1, leading to reliable crashes or scp failure when transferring large files to a VM. The problem arises because virtnet rq dma takes up 16 bytes at the beginning of a new frag, causing an overflow when the frag size is only one page and the total size of the buffer and virtnet rq dma exceeds one page.

Recommendations For Linux kernel versions prior to 6.6.74, update to version 6.6.74 or later to resolve the issue. As a temporary workaround, consider adjusting the sysctl net.core.high order alloc disable value to 0 to minimize the risk of exploitation. Restrict access to the virtio-net component to minimize the risk of crashes or scp failures until the issue is resolved.