CVE-2026-46320
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Summary
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().
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < 8d03e65eb6cfbffec471a6b65416f93679bf3286 | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < f979971835dddbca86cf99e3b2e2b94a408a1ab2 | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < 3f52a86a482a69294c50a5a2a097bd6f4104990a | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < d68eab61944a9b0826fa2e954e42db1aa3201b7a | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < e27c17346628cb56843a83f93ac63c314c00f388 | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < 18a84c35842e19cd3c5534d8cee73d31863f696d | affected |
| Linux | Linux | 0efac27791ee068075d80f07c55a229b1335ce12 < 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 | affected |
| Linux | Linux | 4.20 | affected |
| Linux | Linux | 0 < 4.20 | unaffected |
| Linux | Linux | 5.10.259 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.210 <= 5.15.* | unaffected |
| Linux | Linux | 6.1.176 <= 6.1.* | unaffected |
| Linux | Linux | 6.6.143 <= 6.6.* | unaffected |
| Linux | Linux | 6.12.94 <= 6.12.* | unaffected |
| Linux | Linux | 6.18.36 <= 6.18.* | unaffected |
| Linux | Linux | 7.0.12 <= 7.0.* | unaffected |
| Linux | Linux | 7.1 <= * | unaffected |
Weaknesses
References
- https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286
- https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2
- https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a
- https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05
- https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a
- https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388
- https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696d
- https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2
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