CVE-2026-52945 Vulnerability Analysis & Exploit Details

CVE-2026-52945
Vulnerability Scoring

7.5

/10

Very High Risk

Highly exploitable, CVE-2026-52945 poses a critical security risk that could lead to severe breaches.

Attack Complexity Details

Attack Complexity: Low
Exploits can be performed without significant complexity or special conditions.
Attack Vector: Network
Vulnerability is exploitable over a network without physical access.
Privileges Required: None
No privileges are required for exploitation.
Scope: Unchanged
Exploit remains within the originally vulnerable component.
User Interaction: None
No user interaction is necessary for exploitation.

CVE-2026-52945 Details

Status: Analyzed

Last updated: 🕟 14 Jul 2026, 16:59 UTC
Originally published on: 🕔 24 Jun 2026, 17:17 UTC

Time between publication and last update: 19 days

CVSS Release: version 3

CVSS3 Source

416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS3 Type

Secondary

CVSS3 Vector

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

CVE-2026-52945 Vulnerability Summary

CVE-2026-52945: In the Linux kernel, the following vulnerability has been resolved: Revert "wireguard: device: enable threaded NAPI" This reverts commit 933466fc50a8e4eb167acbd0d8ec96a078462e9c which is commit db9ae3b6b43c79b1ba87eea849fd65efa05b4b2e upstream. We have had three independent production user reports in combination with Cilium utilizing WireGuard as encryption underneath that k8s Pod E/W traffic to certain peer nodes fully stalled. The situation appears as follows: - Occurs very rarely but at random times under heavy networking load. - Once the issue triggers the decryption side stops working completely for that WireGuard peer, other peers keep working fine. The stall happens also for newly initiated connections towards that particular WireGuard peer. - Only the decryption side is affected, never the encryption side. - Once it triggers, it never recovers and remains in this state, the CPU/mem on that node looks normal, no leak, busy loop or crash. - bpftrace on the affected system shows that wg_prev_queue_enqueue fails, thus the MAX_QUEUED_PACKETS (1024 skbs!) for the peer's rx_queue is reached. - Also, bpftrace shows that wg_packet_rx_poll for that peer is never called again after reaching this state for that peer. For other peers wg_packet_rx_poll does get called normally. - Commit db9ae3b ("wireguard: device: enable threaded NAPI") switched WireGuard to threaded NAPI by default. The default has not been changed for triggering the issue, neither did CPU hotplugging occur (i.e. 5bd8de2 ("wireguard: queueing: always return valid online CPU in wg_cpumask_choose_online()")). - The issue has been observed with stable kernels of v5.15 as well as v6.1. It was reported to us that v5.10 stable is working fine, and no report on v6.6 stable either (somewhat related discussion in [0] though). - In the WireGuard driver the only material difference between v5.10 stable and v5.15 stable is the switch to threaded NAPI by default. [0] https://lore.kernel.org/netdev/CA+wXwBTT74RErDGAnj98PqS=wvdh8eM1pi4q6tTdExtjnokKqA@mail.gmail.com/ Breakdown of the problem: 1) skbs arriving for decryption are enqueued to the peer->rx_queue in wg_packet_consume_data via wg_queue_enqueue_per_device_and_peer. 2) The latter only moves the skb into the MPSC peer queue if it does not surpass MAX_QUEUED_PACKETS (1024) which is kept track in an atomic counter via wg_prev_queue_enqueue. 3) In case enqueueing was successful, the skb is also queued up in the device queue, round-robin picks a next online CPU, and schedules the decryption worker. 4) The wg_packet_decrypt_worker, once scheduled, picks these up from the queue, decrypts the packets and once done calls into wg_queue_enqueue_per_peer_rx. 5) The latter updates the state to PACKET_STATE_CRYPTED on success and calls napi_schedule on the per peer->napi instance. 6) NAPI then polls via wg_packet_rx_poll. wg_prev_queue_peek checks on the peer->rx_queue. It will wg_prev_queue_dequeue if the queue->peeked skb was not cached yet, or just return the latter otherwise. (wg_prev_queue_drop_peeked later clears the cache.) 7) From an ordering perspective, the peer->rx_queue has skbs in order while the device queue with the per-CPU worker threads from a global ordering PoV can finish the decryption and signal the skb PACKET_STATE_CRYPTED out of order. 8) A situation can be observed that the first packet coming in will be stuck waiting for the decryption worker to be scheduled for a longer time when the system is under pressure. 9) While this is the case, the other CPUs in the meantime finish decryption and call into napi_schedule. 10) Now in wg_packet_rx_poll it picks up the first in-order skb from the peer->rx_queue and sees that its state is still PACKET_STATE_UNCRYPTED. The NAPI poll routine then exits e ---truncated---

Assessing the Risk of CVE-2026-52945

Access Complexity Graph

The exploitability of CVE-2026-52945 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-52945

With low attack complexity and no required privileges, CVE-2026-52945 is an easy target for cybercriminals. Organizations should prioritize immediate mitigation measures to prevent unauthorized access and data breaches.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-52945, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-52945, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Confidentiality: None
CVE-2026-52945 has no significant impact on data confidentiality.
Integrity: None
CVE-2026-52945 poses no threat to data integrity.
Availability: High
CVE-2026-52945 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-52945 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

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cpe:2.3:o:linux:linux_kernel:6.12.61:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.62:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.62:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.63:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.63:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.64:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.64:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.65:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.65:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.66:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.66:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.67:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.67:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.68:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.68:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.69:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.69:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.70:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.70:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.72:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.12.72:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.3:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.4:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.5:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.6:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.7:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.8:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.9:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.10:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15.11:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.15:rc7:*:*:*:*:*:*

Protect Your Infrastructure against CVE-2026-52945: Combat Critical CVE Threats

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