{"id":"CVE-2026-46321","title":"In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_x…","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_x…","severity":"high","cvss":7.1,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.4.281, < 5.5","linux_kernel >= 5.10.223, < 5.10.259","linux_kernel >= 5.15.164, < 5.15.210","linux_kernel >= 6.1.102, < 6.1.176","linux_kernel >= 6.6.43, < 6.6.143","linux_kernel >= 6.9.12, < 6.10","linux_kernel >= 6.10.2, < 6.12.93","linux_kernel >= 6.13, < 6.18.35","linux_kernel >= 6.19, < 7.0.12","linux_kernel = 7.1"],"patched":["linux_kernel 7.0.12"],"published":"2026-06-09","updated":"2026-10-15","sourceUpdated":"2026-10-15T02:19:53.553","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46321","references":[{"url":"https://git.kernel.org/stable/c/0a6f46a9332ad6958992d64d3b3a81a80b2ca940","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/0e8211fcf9426f5adddf32516ba0f400ceb9544d","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/37a1c268c2c8090bf4dc552d732bd23ba36f8eb0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/5b34f9e4fe2f203724a6e893d6df0316b9670057","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/69863ff2720a0e9871f1a5710f2a33a94217fee0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/98c67be9eb9de72465a071949e84a3cdb8fab5a3","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e915445942af6dcea628bf66d6241641201a0c41","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/f4feb1e20058e407cb00f45aff47f5b7e19a6bbf","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-784472.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"epss":0.00129,"epssPercentile":0.02232,"ingestedAt":"2026-10-15T03:30:12.899Z","slug":"CVE-2026-46321","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ntun: free page on short-frame rejection in tun_xdp_one()\n\ntun_xdp_one() returns -EINVAL on a frame shorter than ETH_HLEN without\nfreeing the page that vhost_net_build_xdp() allocated for it.\ntun_sendmsg() discards that -EINVAL and still returns total_len, so\nvhost_tx_batch() takes the success path and never frees the page; each\nshort frame in a batch leaks one page-frag chunk.\n\nA local process that can open /dev/net/tun and /dev/vhost-net can hit\nthis path: it attaches a tun/tap device as the vhost-net backend and\nfeeds TX descriptors whose length minus the virtio-net header is below\nETH_HLEN. Each kick leaks the page-frag chunks for that batch, and a\ntight submission loop exhausts host memory and triggers an OOM panic.\nFree the page before returning -EINVAL, matching the XDP-program error\npath in the same function.\n\n## Affected\n\n- `linux_kernel >= 5.4.281, < 5.5`\n- `linux_kernel >= 5.10.223, < 5.10.259`\n- `linux_kernel >= 5.15.164, < 5.15.210`\n- `linux_kernel >= 6.1.102, < 6.1.176`\n- `linux_kernel >= 6.6.43, < 6.6.143`\n- `linux_kernel >= 6.9.12, < 6.10`\n- `linux_kernel >= 6.10.2, < 6.12.93`\n- `linux_kernel >= 6.13, < 6.18.35`\n- `linux_kernel >= 6.19, < 7.0.12`\n- `linux_kernel = 7.1`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 7.0.12`","depth":"twilight","depthScore":39,"depthScoreParts":{"impact":39.1,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}