Kernel TUN/XDP PageLeak in tun_xdp_one() via Short Frame Error
CVE-2026-46321 Published on June 9, 2026
tun: free page on short-frame rejection in tun_xdp_one()
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.
Products Associated with CVE-2026-46321
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Affected Versions
Linux:- Version 049584807f1d797fc3078b68035450a9769eb5c3 and below 69863ff2720a0e9871f1a5710f2a33a94217fee0 is affected.
- Version 049584807f1d797fc3078b68035450a9769eb5c3 and below 37a1c268c2c8090bf4dc552d732bd23ba36f8eb0 is affected.
- Version 049584807f1d797fc3078b68035450a9769eb5c3 and below 98c67be9eb9de72465a071949e84a3cdb8fab5a3 is affected.
- Version 049584807f1d797fc3078b68035450a9769eb5c3 and below f4feb1e20058e407cb00f45aff47f5b7e19a6bbf is affected.
- Version 32b0aaba5dbc85816898167d9b5d45a22eae82e9 is affected.
- Version 6100e0237204890269e3f934acfc50d35fd6f319 is affected.
- Version 589382f50b4a5d90d16d8bc9dcbc0e927a3e39b2 is affected.
- Version ad6b3f622ccfb4bfedfa53b6ebd91c3d1d04f146 is affected.
- Version d5ad89b7d01ed4e66fd04734fc63d6e78536692a is affected.
- Version a9d1c27e2ee3b0ea5d40c105d6e728fc114470bb is affected.
- Version 8418f55302fa1d2eeb73e16e345167e545c598a5 is affected.
- Version 5.4.281 and below 5.5 is affected.
- Version 5.10.223 and below 5.11 is affected.
- Version 5.15.164 and below 5.16 is affected.
- Version 6.1.102 and below 6.2 is affected.
- Version 6.6.43 and below 6.7 is affected.
- Version 6.9.12 and below 6.10 is affected.
- Version 6.10.2 and below 6.11 is affected.
- Version 6.11 is affected.
- Before 6.11 is unaffected.
- Version 6.12.93, <= 6.12.* is unaffected.
- Version 6.18.35, <= 6.18.* is unaffected.
- Version 7.0.12, <= 7.0.* is unaffected.
- Version 7.1-rc6, <= * is unaffected.