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Vulnerability record · CVE-2026-31678 · published 25 April 2026

CVE-2026-31678: Linux kernel toctou race condition vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.

7.8 CVSS 3.1 High EPSS 0.14% · top 97.5% CWE-367 · TOCTOU race condition
7.8CVSS 3.1 base score
0.14%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: defer tunnel netdev_put to RCU release ovs_netdev_tunnel_destroy() may run after NETDEV_UNREGISTER already detached the device. Dropping the netdev reference in destroy can race with concurrent readers that still observe vport->dev. Do not release vport->dev in ovs_netdev_tunnel_destroy(). Instead, let vport_netdev_free() drop the reference from the RCU callback, matching the non-tunnel destroy path and avoiding additional synchronization under RTNL.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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/42f0d3d81209654c08ffdde5a34b9b92d2645896 Patch
https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c Patch
https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab Patch
https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc Patch
https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8 Patch
https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31678), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.