CVE-2026-31678

openvswitch: defer tunnel netdev_put to RCU release

State: Published
Severity: 7.8 High
Published: Apr 25, 2026
Updated: Oct 30, 2026
Reserved: Mar 9, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-362 Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Affected Products

Product	Versions
LinuxLinux	a9020fde67a6eb77f8130feff633189f99264db1 to before f0ec49d3a39c1f5a4f3270ea27ca0854fad2a2a2Affected a9020fde67a6eb77f8130feff633189f99264db1 to before 9d56aced21fb9c104e8a3f3be9b21fbafe448ffcAffected a9020fde67a6eb77f8130feff633189f99264db1 to before 42f0d3d81209654c08ffdde5a34b9b92d2645896Affected a9020fde67a6eb77f8130feff633189f99264db1 to before bbe7bd722bfaea36aab3da6cc60fb4a05c644643Affected a9020fde67a6eb77f8130feff633189f99264db1 to before 98b726ab5e2a4811e27c28e4d041f75bba147eabAffected a9020fde67a6eb77f8130feff633189f99264db1 to before b8c56a3fc5d879c0928f207a756b0f067f06c6a8Affected a9020fde67a6eb77f8130feff633189f99264db1 to before 6931d21f87bc6d657f145798fad0bf077b82486cAffected
LinuxLinux	4.3Affected before 4.3Not affected 5.15.224 through 5.15.Not affected 6.1.168 through 6.1.Not affected 6.6.131 through 6.6.Not affected 6.12.80 through 6.12.Not affected 6.18.21 through 6.18.Not affected 6.19.11 through 6.19.Not affected 7.0 and laterNot affected

Product

Versions

LinuxLinux

a9020fde67a6eb77f8130feff633189f99264db1 to before f0ec49d3a39c1f5a4f3270ea27ca0854fad2a2a2Affected
a9020fde67a6eb77f8130feff633189f99264db1 to before 9d56aced21fb9c104e8a3f3be9b21fbafe448ffcAffected
a9020fde67a6eb77f8130feff633189f99264db1 to before 42f0d3d81209654c08ffdde5a34b9b92d2645896Affected
a9020fde67a6eb77f8130feff633189f99264db1 to before bbe7bd722bfaea36aab3da6cc60fb4a05c644643Affected
a9020fde67a6eb77f8130feff633189f99264db1 to before 98b726ab5e2a4811e27c28e4d041f75bba147eabAffected
a9020fde67a6eb77f8130feff633189f99264db1 to before b8c56a3fc5d879c0928f207a756b0f067f06c6a8Affected
a9020fde67a6eb77f8130feff633189f99264db1 to before 6931d21f87bc6d657f145798fad0bf077b82486cAffected

LinuxLinux

4.3Affected
before 4.3Not affected
5.15.224 through 5.15.*Not affected
6.1.168 through 6.1.*Not affected
6.6.131 through 6.6.*Not affected
6.12.80 through 6.12.*Not affected
6.18.21 through 6.18.*Not affected
6.19.11 through 6.19.*Not affected
7.0 and laterNot affected

References

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