CVE-2026-46193

IPsec traffic interruption via misaligned ESN callbacks

Published May 28, 2026 · Updated May 28, 2026

Denial of service in affected Linux Kernel releases allows local users to interrupt IPsec AH traffic when ESN and async hashing are active. The IPv4 and IPv6 AH completion callbacks locate saved authentication data and ICV bytes without skipping the four-byte ESN sequence-high slot, so they copy or compare incorrect offsets. Exploitation requires a configured AH security association with ESN plus an asynchronous hash implementation; the demonstrated result is complete packet loss, not a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux Kernel releases allows local users to interrupt IPsec AH traffic when ESN and async hashing are active. The IPv4 and IPv6 AH completion callbacks locate saved authentication data and ICV bytes without skipping the four-byte ESN sequence-high slot, so they copy or compare incorrect offsets. Exploitation requires a configured AH security association with ESN plus an asynchronous hash implementation; the demonstrated result is complete packet loss, not a kernel crash.

The record

CVE
CVE-2026-46193
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 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.

  1. Affected versionversion=3.15
  2. Affected versionversion=d4d573d0334d07341beffdcf97e2b85d3955d8ae <0555d4f526232b3c9e3afbcd490c0c0793aefec6
  3. Affected versionversion=d4d573d0334d07341beffdcf97e2b85d3955d8ae <2ffaa7a94f9a4d22724364a1821735a0231d9f8d
  4. Affected versionversion=d4d573d0334d07341beffdcf97e2b85d3955d8ae <729899a2aa8bda7844be0cdcd3b470f11b912eda
  5. Affected versionversion=d4d573d0334d07341beffdcf97e2b85d3955d8ae <7db99a09b3bc87268287bc7ab5f2e7f382b5ad87
  6. Affected versionversion=d4d573d0334d07341beffdcf97e2b85d3955d8ae <ec54093e6a8f87e800bb6aa15eb7fc1e33faa524

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.15; version=d4d573d0334d07341beffdcf97e2b85d3955d8ae <0555d4f526232b3c9e3afbcd490c0c0793aefec6; version=d4d573d0334d07341beffdcf97e2b85d3955d8ae <2ffaa7a94f9a4d22724364a1821735a0231d9f8d; version=d4d573d0334d07341beffdcf97e2b85d3955d8ae <729899a2aa8bda7844be0cdcd3b470f11b912eda; version=d4d573d0334d07341beffdcf97e2b85d3955d8ae <7db99a09b3bc87268287bc7ab5f2e7f382b5ad87; version=d4d573d0334d07341beffdcf97e2b85d3955d8ae <ec54093e6a8f87e800bb6aa15eb7fc1e33faa524

Published CVSS scores

5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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