CVE-2026-46321
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk3th percentile - higher than 3% of all known CVEs
Summary
In the Linux kernel, in the tun driver, a memory leak was found in tun_xdp_one() when rejecting frames shorter than ETH_HLEN. The page allocated by vhost_net_build_xdp() was not freed, leading to memory exhaustion. A local attacker can exploit this to trigger an OOM panic.
Risk Assessment
A local attacker can open /dev/net/tun and /dev/vhost-net devices and send short TX descriptors, causing memory leaks and leading to an OOM panic, resulting in denial of service.
Recommendation
It is recommended to immediately update the Linux kernel to a version containing the fix for CVE-2026-46321.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: tun: free page on short-frame rejection in tun_xdp_one() tun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without freeing the page that vhost_net_build_xdp() allocated for it. tun_sendmsg() discards that -EINVAL and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page; each short frame in a batch leaks one page-frag chunk. A local process that can open /dev/net/tun and /dev/vhost-net can hit this path: it attaches a tun/tap device as the vhost-net backend and feeds TX descriptors whose length minus the virtio-net header is below ETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a tight submission loop exhausts host memory and triggers an OOM panic. Free the page before returning -EINVAL, matching the XDP-program error path in the same function.