Peer traffic denial via lost NAPI scheduling
Published Jun 24, 2026 · Updated Jun 24, 2026
Denial of service in Linux kernel WireGuard 6.12.34 through 6.12.73 allows remote attackers to stall decryption for a peer. Under heavy load, out-of-order decryption lets wg_packet_rx_poll encounter an unencrypted head packet and exit while NAPI scheduling is lost, filling peer->rx_queue. The affected peer's inbound tunnel traffic remains stalled without a crash; other peers and outbound encryption continue.
Summary
What happened
Denial of service in Linux kernel WireGuard 6.12.34 through 6.12.73 allows remote attackers to stall decryption for a peer. Under heavy load, out-of-order decryption lets wg_packet_rx_poll encounter an unencrypted head packet and exit while NAPI scheduling is lost, filling peer->rx_queue. The affected peer's inbound tunnel traffic remains stalled without a crash; other peers and outbound encryption continue.
The record
- CVE
- CVE-2026-52945
- Published
- Jun 24, 2026
- Updated
- Jun 24, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 24, 2026CVE publishedPublication date reported by the CVE source.
- Jun 24, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.12.34 <6.12.74
- Affected versionversion=933466fc50a8e4eb167acbd0d8ec96a078462e9c <e94b369ff82f9bc84f090f271bd78f41c9f6ab2f
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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