High 7.8Published Apr 25, 2026

CVE-2026-31678openvswitch: defer tunnel netdev_put to RCU release

Updated under an hour ago (Oct 28, 2026, 8:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-362
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from a9020fde67a6eb77f8130feff633189f99264db1 before 9d56aced21fb9c104e8a3f3be9b21fbafe448ffc; from a9020fde67a6eb77f8130feff633189f99264db1 before 42f0d3d81209654c08ffdde5a34b9b92d2645896; from a9020fde67a6eb77f8130feff633189f99264db1 before bbe7bd722bfaea36aab3da6cc60fb4a05c644643; from a9020fde67a6eb77f8130feff633189f99264db1 before 98b726ab5e2a4811e27c28e4d041f75bba147eab; from a9020fde67a6eb77f8130feff633189f99264db1 before b8c56a3fc5d879c0928f207a756b0f067f06c6a8; from a9020fde67a6eb77f8130feff633189f99264db1 before 6931d21f87bc6d657f145798fad0bf077b82486c	CNA record
linux linux_kernel linux:linux_kernel	from 4.3 before 6.1.168; from 6.2 before 6.6.131; from 6.7 before 6.12.80; from 6.13 before 6.18.21; from 6.19 before 6.19.11; 7.0; 7.0; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/9d56aced21fb9c104e8a3f3be9b21fbafe448ffc	patch
https://git.kernel.org/stable/c/42f0d3d81209654c08ffdde5a34b9b92d2645896	patch
https://git.kernel.org/stable/c/bbe7bd722bfaea36aab3da6cc60fb4a05c644643	patch
https://git.kernel.org/stable/c/98b726ab5e2a4811e27c28e4d041f75bba147eab	patch
https://git.kernel.org/stable/c/b8c56a3fc5d879c0928f207a756b0f067f06c6a8	patch
https://git.kernel.org/stable/c/6931d21f87bc6d657f145798fad0bf077b82486c	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.