CVE-2026-74475Network attack vector

Network disruption via unsynchronized VXLAN MAC read

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in Linux VXLAN allows remote attackers to disrupt networking through concurrent neighbor-address updates. The route_shortcircuit() path copies n->ha without its seqlock, so an asynchronous update can produce a torn or partially updated MAC address. Reachability requires an active VXLAN route-shortcircuit path during a neighbor update, and the corrupted address can interrupt packet delivery.

CVSS severity10.0
Critical
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in Linux VXLAN allows remote attackers to disrupt networking through concurrent neighbor-address updates. The route_shortcircuit() path copies n->ha without its seqlock, so an asynchronous update can produce a torn or partially updated MAC address. Reachability requires an active VXLAN route-shortcircuit path during a neighbor update, and the corrupted address can interrupt packet delivery.

The record

CVE
CVE-2026-74475
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.8
  2. Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <05f2987f73daa05333fd713d05546142f9f7c5f0
  3. Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d
  4. Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0
  5. Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <ec341bb76d77b4c2948764375ee6bfeef4bb41c3
  6. Affected versionversion=e4f67addf158f98f8197e08974966b18480dc751 <ff89415d34c3ab9f5312316423122e664ed3524f

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=e4f67addf158f98f8197e08974966b18480dc751 <05f2987f73daa05333fd713d05546142f9f7c5f0; version=e4f67addf158f98f8197e08974966b18480dc751 <8eca411347e1d38964f9ed2c8d3b6ab0e7e4473d; version=e4f67addf158f98f8197e08974966b18480dc751 <d08e8ac13f2e228cc7fc3c70b5ebe71557b624a0; version=e4f67addf158f98f8197e08974966b18480dc751 <ec341bb76d77b4c2948764375ee6bfeef4bb41c3; version=e4f67addf158f98f8197e08974966b18480dc751 <ff89415d34c3ab9f5312316423122e664ed3524f

Published CVSS scores

10.0Linux kernel CVE teamCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:L
5.5Red HatCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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