Description
In the Linux kernel, the following vulnerability has been resolved:
tun: free page on build_skb failure in tun_xdp_one()
When build_skb() fails in tun_xdp_one(), the function sets ret to -ENOMEM and jumps to the out label, which returns without freeing the page that vhost_net_build_xdp() allocated for the frame. As with the short-frame rejection path, tun_sendmsg() discards the per-buffer error and still returns total_len, so vhost_tx_batch() takes the success path and never frees the page. Each build_skb() failure in a batch leaks one page-frag chunk.
Free the page before taking the error path, matching the put_page() the other error exits of tun_xdp_one() already perform.
Metrics
CVSS 3.1 7.1/10
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < 793385c154771603b8671dd8338927221e9d8d78; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < 60d9c0d6cdde5420d6483c921b16fe5465eb5238; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < d16e38fac09a47bfcf98c1ad65a1bb53f94540f5; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < aa308e9dbb9acb17cacdbbce9e4504f69bac8385; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < 4fefc6156a162a9f50035c12091a5e5130c82c6e; >= 043d222f93ab8c76b56a3b315cd8692e35affb6c, < aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 |
| Linux | Linux | 4.20 |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
References
- https://git.kernel.org/stable/c/2638a9c1521905bb5c5d1e95c8fbc09f79148ed7Patch
- https://git.kernel.org/stable/c/26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9Patch
- https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6ePatch
- https://git.kernel.org/stable/c/60d9c0d6cdde5420d6483c921b16fe5465eb5238Patch
- https://git.kernel.org/stable/c/793385c154771603b8671dd8338927221e9d8d78Patch
- https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385Patch
- https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8Patch
- https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5Patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- Jun 9, 2026
- Last modified
- Oct 19, 2026
- NVD status
- Modified