CVE-2026-31678

Summary

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.

Impact & exploitability

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

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896Patch
• https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486cPatch
• https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eabPatch
• https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffcPatch
• https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8Patch
• https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643Patch
• https://git.kernel.org/stable/c/f0ec49d3a39c1f5a4f3270ea27ca0854fad2a2a2