# CVE-2026-31678

> Vulnerability · severity: **HIGH** (CVSS 7.8).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31678
- **Published:** 2026-04-25
- **CVSS severity:** HIGH
- **CVSS base score:** 7.8
- **CWE codes:** CWE-367

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31678

## Citation

> AI Analytics. CVE-2026-31678. Retrieved 2026-08-08 from https://api.ai-analytics.org/cve/CVE-2026-31678. Derived from NIST NVD. Licensed CC0.

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