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Vulnerability record · CVE-2026-46320 · published 9 June 2026

CVE-2026-46320: Linux kernel vulnerability

Linux · Linux Kernel

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().

7.4 CVSS 3.1 High EPSS 0.39% · top 69.9%
7.4CVSS 3.1 base score
0.39%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: 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().

CVSS:3.1/AV:A/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/18a84c35842e19cd3c5534d8cee73d31863f696d Patch
https://git.kernel.org/stable/c/3bcf7aec6a9d16438f2cec29f5d7c8d5b8edf9b2 Patch
https://git.kernel.org/stable/c/3f52a86a482a69294c50a5a2a097bd6f4104990a Patch
https://git.kernel.org/stable/c/8d03e65eb6cfbffec471a6b65416f93679bf3286 Patch
https://git.kernel.org/stable/c/d30aac0fa00ca0afc3e08174cf7f974a66bdcf05 Patch
https://git.kernel.org/stable/c/d68eab61944a9b0826fa2e954e42db1aa3201b7a Patch
https://git.kernel.org/stable/c/e27c17346628cb56843a83f93ac63c314c00f388 Patch
https://git.kernel.org/stable/c/f979971835dddbca86cf99e3b2e2b94a408a1ab2 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-46320), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.