IT

Tracker / CVE-2026-46321

CVE-2026-46321

High 7.1

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.

Affected products and versions

linux linux_kernel
linux linux_kernel · 5.10.223 → 5.10.259
linux linux_kernel · 5.15.164 → 5.15.210
linux linux_kernel · 5.4.281 → 5.5
linux linux_kernel · 6.1.102 → 6.1.176
linux linux_kernel · 6.10.2 → 6.12.93
linux linux_kernel · 6.13 → 6.18.35
linux linux_kernel · 6.19 → 7.0.12
linux linux_kernel · 6.6.43 → 6.6.143
linux linux_kernel · 6.9.12 → 6.10

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References