CVE-2023-53109

Service interruption via tunnel headroom data race

Published May 2, 2025 · Updated May 11, 2026

Data race in Linux kernel IP tunnel transmission allows local users to interrupt service by triggering concurrent tunnel traffic. The tunnel transmit paths update dev->needed_headroom while ip_tunnel_xmit and LL_RESERVED_SPACE helpers read it without single-copy access annotations, allowing inconsistent headroom values. Low-privileged local access and concurrent tunnel transmission are required; published assessments limit impact to availability but do not identify whether failure means a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data race in Linux kernel IP tunnel transmission allows local users to interrupt service by triggering concurrent tunnel traffic. The tunnel transmit paths update dev->needed_headroom while ip_tunnel_xmit and LL_RESERVED_SPACE helpers read it without single-copy access annotations, allowing inconsistent headroom values. Low-privileged local access and concurrent tunnel transmission are required; published assessments limit impact to availability but do not identify whether failure means a hang, crash, or reboot.

The record

CVE
CVE-2023-53109
Published
May 2, 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. May 2, 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

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=4.7
  2. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <4b397c06cb987935b1b097336532aa6b4210e091
  3. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <51f3bd3765bc5ca4583af07a00833da00d2ace1d
  4. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <5aaab217c8f5387b9c5fff9e940d80f135e04366
  5. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <8e206f66d824b3b28a7f9ee1366dfc79a937bb46
  6. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <9b86a8702b042ee4e15d2d46375be873a6a8834f
  7. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <a69b72b57b7d269e833e520ba7500d556e8189b6
  8. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <be59b87ee4aed81db7c10e44f603866a0ac3ca5d
  9. Affected versionversion=8eb30be0352d09165e94a41fef1c7b994dca0714 <e0a557fc1daf5c1086e47150a4571aebadbb62be

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.7; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <4b397c06cb987935b1b097336532aa6b4210e091; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <51f3bd3765bc5ca4583af07a00833da00d2ace1d; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <5aaab217c8f5387b9c5fff9e940d80f135e04366; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <8e206f66d824b3b28a7f9ee1366dfc79a937bb46; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <9b86a8702b042ee4e15d2d46375be873a6a8834f; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <a69b72b57b7d269e833e520ba7500d556e8189b6; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <be59b87ee4aed81db7c10e44f603866a0ac3ca5d; version=8eb30be0352d09165e94a41fef1c7b994dca0714 <e0a557fc1daf5c1086e47150a4571aebadbb62be

Published CVSS scores

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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