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Review reviewHigh

CVE-2026-52945

Linux Linux, linux kernel

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...

CVSS
7.5
EPSS
0.31%
23.3% percentile
CISA KEV
Not listed
Published
2026.06.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.31%
Technical severityCVSS 7.5

Vulnerability overview

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...

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 18e65229a328304a7ef59899a30fd34ad73ed56b < cfdb22762f903d95c36ab91e9fe6167f22fa9f6d, >= fb978675ccfd4a93549e49624127d8332cc61cbf < 42bc3f45425b607a5ca7b7aaaab661b54407c8f8, >= 8c9e9cd398777fd60ba202211da1110614cb5bc5 < 168ee1549fa24fff2ab924a2ca7b1d85f30e062d, >= 933466fc50a8e4eb167acbd0d8ec96a078462e9c < e94b369ff82f9bc84f090f271bd78f41c9f6ab2f, >= aba544ff9ec522e120b1b3d8b32efa4e6d16d4d7, >= 6.15.3 < 6.16, >= 5.15.186 < 5.15.201, >= 6.1.142 < 6.1.164, >= 6.6.94 < 6.6.127, >= 6.12.34 < 6.12.74
Fixed versions
5.15.201, 6.1.164, 6.6.127, 6.12.74, 6.16

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available