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Vulnerability record · CVE-2026-46322 · published 9 June 2026

CVE-2026-46322: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.1 CVSS 3.1 High EPSS 0.19% · top 92.7%
7.1CVSS 3.1 base score
0.19%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
23 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/2638a9c1521905bb5c5d1e95c8fbc09f79148ed7 Patch
https://git.kernel.org/stable/c/26fe549b5192536b6c1c68a2dfdc8c0dcf9fa4a9 Patch
https://git.kernel.org/stable/c/4fefc6156a162a9f50035c12091a5e5130c82c6e Patch
https://git.kernel.org/stable/c/60d9c0d6cdde5420d6483c921b16fe5465eb5238 Patch
https://git.kernel.org/stable/c/793385c154771603b8671dd8338927221e9d8d78 Patch
https://git.kernel.org/stable/c/aa308e9dbb9acb17cacdbbce9e4504f69bac8385 Patch
https://git.kernel.org/stable/c/aa8963fdce667a42fb7f0bdd2909fadcab02f9a8 Patch
https://git.kernel.org/stable/c/d16e38fac09a47bfcf98c1ad65a1bb53f94540f5 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46322), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.