CVE-2026-46322

tun: free page on build_skb failure in tun_xdp_one()

State: Published
Severity: 7.1 High
Published: Jun 9, 2026
Updated: Oct 19, 2026
Reserved: May 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H	Linux

Weaknesses

CWE-401 Missing Release of Memory after Effective Lifetime

Affected Products

Product	Versions
LinuxLinux	043d222f93ab8c76b56a3b315cd8692e35affb6c to before 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 793385c154771603b8671dd8338927221e9d8d78Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 60d9c0d6cdde5420d6483c921b16fe5465eb5238Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before d16e38fac09a47bfcf98c1ad65a1bb53f94540f5Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before aa308e9dbb9acb17cacdbbce9e4504f69bac8385Affected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before 4fefc6156a162a9f50035c12091a5e5130c82c6eAffected 043d222f93ab8c76b56a3b315cd8692e35affb6c to before aa8963fdce667a42fb7f0bdd2909fadcab02f9a8Affected
LinuxLinux	4.20Affected before 4.20Not affected 5.10.259 through 5.10.Not affected 5.15.210 through 5.15.Not affected 6.1.176 through 6.1.Not affected 6.6.143 through 6.6.Not affected 6.12.93 through 6.12.Not affected 6.18.35 through 6.18.Not affected 7.0.12 through 7.0.*Not affected 7.1 and laterNot affected

Product

Versions

LinuxLinux

043d222f93ab8c76b56a3b315cd8692e35affb6c to before 26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 793385c154771603b8671dd8338927221e9d8d78Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 2638a9c1521905bb5c5d1e95c8fbc09f79148ed7Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 60d9c0d6cdde5420d6483c921b16fe5465eb5238Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before d16e38fac09a47bfcf98c1ad65a1bb53f94540f5Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before aa308e9dbb9acb17cacdbbce9e4504f69bac8385Affected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before 4fefc6156a162a9f50035c12091a5e5130c82c6eAffected
043d222f93ab8c76b56a3b315cd8692e35affb6c to before aa8963fdce667a42fb7f0bdd2909fadcab02f9a8Affected

LinuxLinux

4.20Affected
before 4.20Not affected
5.10.259 through 5.10.*Not affected
5.15.210 through 5.15.*Not affected
6.1.176 through 6.1.*Not affected
6.6.143 through 6.6.*Not affected
6.12.93 through 6.12.*Not affected
6.18.35 through 6.18.*Not affected
7.0.12 through 7.0.*Not affected
7.1 and laterNot affected

References

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