CVE-2026-46320
HighCVSS 7.4Exploitation Probability (EPSS)
Low risk14th percentile - higher than 14% of all known CVEs
Summary
A memory leak was discovered in the tap_get_user_xdp() function of the Linux kernel's TAP driver. When a frame is shorter than ETH_HLEN or when build_skb() fails, the page allocated by vhost_net_build_xdp() is not freed, causing page-frag leaks.
Risk Assessment
This memory leak can exhaust system resources, leading to performance degradation or denial of service (DoS) in environments using TAP interfaces, such as virtualization.
Recommendation
Immediately update the Linux kernel to a version containing the fix (commit addressing the leak). Monitor for the availability of the patch for your distribution.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tap: free page on error paths in tap_get_user_xdp() tap_get_user_xdp() rejects a frame shorter than ETH_HLEN with -EINVAL, and returns -ENOMEM when build_skb() fails. Both paths jump to the err label without freeing the page that vhost_net_build_xdp() allocated for the frame. tap_sendmsg() discards the per-buffer return value and always returns 0, so vhost_tx_batch() takes the success path and never frees the page; each rejected frame in a batch leaks one page-frag chunk. Free the page on both error paths, before the skb is built. This is the tap counterpart of the same leak in tun_xdp_one().