Description
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().
Metrics
CVSS 3.1 7.4/10
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 0efac27791ee068075d80f07c55a229b1335ce12, < 8d03e65eb6cfbffec471a6b65416f93679bf3286; >= 0efac27791ee068075d80f07c55a229b1335ce12, < f979971835dddbca86cf99e3b2e2b94a408a1ab2; >= 0efac27791ee068075d80f07c55a229b1335ce12, < 3f52a86a482a69294c50a5a2a097bd6f4104990a; >= 0efac27791ee068075d80f07c55a229b1335ce12, < d30aac0fa00ca0afc3e08174cf7f974a66bdcf05; >= 0efac27791ee068075d80f07c55a229b1335ce12, < d68eab61944a9b0826fa2e954e42db1aa3201b7a; >= 0efac27791ee068075d80f07c55a229b1335ce12, < e27c17346628cb56843a83f93ac63c314c00f388; >= 0efac27791ee068075d80f07c55a229b1335ce12, < 18a84c35842e19cd3c5534d8cee73d31863f696d; >= 0efac27791ee068075d80f07c55a229b1335ce12, < 3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 |
| Linux | Linux | 4.20 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
References
- https://git.kernel.org/stable/c/18a84c35842e19cd3c5534d8cee73d31863f696dPatch
- https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2Patch
- https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990aPatch
- https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286Patch
- https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05Patch
- https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7aPatch
- https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388Patch
- https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- Jun 9, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Modified