CVE-2025-38413
HighCVSS 7.7Exploitation Probability (EPSS)
Low risk6th percentile - higher than 6% of all known CVEs
Summary
In the virtio-net driver in the Linux kernel, a bug was found in the frame length check within the buf_to_xdp function for XSK (XDP Socket). For the first buffer, the frame length was incorrectly compared with a value including vi->hdr_len, potentially exceeding the allocated chunk size.
Risk Assessment
This vulnerability can cause data corruption or system crashes during XDP packet processing in virtualized environments using virtio-net and XSK.
Recommendation
Apply the kernel patch that adds an extra argument to buf_to_xdp to differentiate the first buffer from others. Update the kernel to a version containing the fix.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: virtio-net: xsk: rx: fix the frame's length check When calling buf_to_xdp, the len argument is the frame data's length without virtio header's length (vi->hdr_len). We check that len with xsk_pool_get_rx_frame_size() + vi->hdr_len to ensure the provided len does not larger than the allocated chunk size. The additional vi->hdr_len is because in virtnet_add_recvbuf_xsk, we use part of XDP_PACKET_HEADROOM for virtio header and ask the vhost to start placing data from hard_start + XDP_PACKET_HEADROOM - vi->hdr_len not hard_start + XDP_PACKET_HEADROOM But the first buffer has virtio_header, so the maximum frame's length in the first buffer can only be xsk_pool_get_rx_frame_size() not xsk_pool_get_rx_frame_size() + vi->hdr_len like in the current check. This commit adds an additional argument to buf_to_xdp differentiate between the first buffer and other ones to correctly calculate the maximum frame's length.