CVE-2025-38037

Local service interruption via VXLAN FDB data race

Published Jun 18, 2025 · Updated May 11, 2026

Linux VXLAN FDB handling allows local users to interrupt service by sending packets concurrently through a configured VXLAN interface. The vxlan_xmit path reads and writes each FDB entry's used and updated timestamps from multiple threads without READ_ONCE() or WRITE_ONCE(), producing a data race. Reachability requires local packet-transmission access to a configured VXLAN path; no confidentiality or integrity effect is reported.

CVSS severity7.0
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Linux VXLAN FDB handling allows local users to interrupt service by sending packets concurrently through a configured VXLAN interface. The vxlan_xmit path reads and writes each FDB entry's used and updated timestamps from multiple threads without READ_ONCE() or WRITE_ONCE(), producing a data race. Reachability requires local packet-transmission access to a configured VXLAN path; no confidentiality or integrity effect is reported.

The record

CVE
CVE-2025-38037
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=3.7
  2. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <02a33b1035a307453a1da6ce0a1bf3676be287d7
  3. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <13cba3f837903f7184d6e9b6137d5165ffe82a8f
  4. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <4eceb7eae6ea7c950384c34e6dbbe872c981935f
  5. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <784b78295a3a58bf052339dd669e6e03710220d3
  6. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <87d076987a9ba106c83412fcd113656f71af05a1
  7. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <a6644aeb8ddf196dec5f8e782293c36f065df4d7
  8. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <e033da39fc6abbddab6c29624acef80757f273fa
  9. Affected versionversion=d342894c5d2f8c7df194c793ec4059656e09ca31 <f6205f8215f12a96518ac9469ff76294ae7bd612

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <02a33b1035a307453a1da6ce0a1bf3676be287d7; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <13cba3f837903f7184d6e9b6137d5165ffe82a8f; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <4eceb7eae6ea7c950384c34e6dbbe872c981935f; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <784b78295a3a58bf052339dd669e6e03710220d3; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <87d076987a9ba106c83412fcd113656f71af05a1; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <a6644aeb8ddf196dec5f8e782293c36f065df4d7; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <e033da39fc6abbddab6c29624acef80757f273fa; version=d342894c5d2f8c7df194c793ec4059656e09ca31 <f6205f8215f12a96518ac9469ff76294ae7bd612

Published CVSS scores

7.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5CanonicalCVSS: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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

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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