High · published June 9, 2026
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().
| Product | Versions | Fixed in |
|---|---|---|
| linux/linux_kernel | ≥ 4.20, < 5.10.259 | 5.10.259 |
| linux/linux_kernel | ≥ 5.11, < 5.15.210 | 5.15.210 |
| linux/linux_kernel | ≥ 5.16, < 6.1.176 | 6.1.176 |
| linux/linux_kernel | ≥ 6.2, < 6.6.143 | 6.6.143 |
| linux/linux_kernel | ≥ 6.7, < 6.12.94 | 6.12.94 |
| linux/linux_kernel | ≥ 6.13, < 6.18.36 | 6.18.36 |
| linux/linux_kernel | ≥ 6.19, < 7.0.12 | 7.0.12 |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |
| linux/linux_kernel | all versions | — |