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CVE-2026-52945

kernel: Revert "wireguard: device: enable threaded NAPI"

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · June 24, 2026

Updated · October 2, 2026

Description

A flaw was found in the Linux kernel's WireGuard component. Under heavy network load, particularly when used with Cilium, the threaded NAPI (New API) implementation can cause the decryption side for a WireGuard peer to stop processing traffic. This leads to a complete stall of network communication for that peer, resulting in a Denial of Service (DoS) condition where data cannot be received.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-367 · Time-of-check Time-of-use (TOCTOU) Race Condition