CVE-2024-26752

Packet corruption via miscalculated L2TP message length

Published Apr 3, 2024 · Updated May 23, 2026

Incorrect length calculation in the Linux kernel's L2TP IPv6 send path allows local users to corrupt outgoing packets. An operator-precedence error in l2tp_ip6_sendmsg reduces every nonempty payload length passed to ip6_append_data to the transport-header length. Triggering requires a local low-privileged user to exercise L2TP IPv6 while an outgoing socket buffer is already partially occupied; packets are malformed on the wire.

CVSS severity5.5
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect length calculation in the Linux kernel's L2TP IPv6 send path allows local users to corrupt outgoing packets. An operator-precedence error in l2tp_ip6_sendmsg reduces every nonempty payload length passed to ip6_append_data to the transport-header length. Triggering requires a local low-privileged user to exercise L2TP IPv6 while an outgoing socket buffer is already partially occupied; packets are malformed on the wire.

The record

CVE
CVE-2024-26752
Published
Apr 3, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-131, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=1fc793d68d50dee4782ef2e808913d5dd880bcc6 <c1d3a84a67db910ce28a871273c992c3d7f9efb5
  2. Affected versionversion=4.14.327 <4.15
  3. Affected versionversion=4.19.296 <4.19.308
  4. Affected versionversion=5.10.198 <5.10.211
  5. Affected versionversion=5.15.135 <5.15.150
  6. Affected versionversion=5.4.258 <5.4.270
  7. Affected versionversion=559d697c5d072593d22b3e0bd8b8081108aeaf59 <4c3ce64bc9d36ca9164dd6c77ff144c121011aae
  8. Affected versionversion=6.1.57 <6.1.80
  9. Affected versionversion=6.5.7 <6.6
  10. Affected versionversion=6.6
  11. Affected versionversion=7626b9fed53092aa2147978070e610ecb61af844
  12. Affected versionversion=96b2e1090397217839fcd6c9b6d8f5d439e705ed <dcb4d14268595065c85dc5528056713928e17243
  13. Affected versionversion=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79
  14. Affected versionversion=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <804bd8650a3a2bf3432375f8c97d5049d845ce56
  15. Affected versionversion=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <83340c66b498e49353530e41542500fc8a4782d6
  16. Affected versionversion=cd1189956393bf850b2e275e37411855d3bd86bb <0da15a70395182ee8cb75716baf00dddc0bea38d
  17. Affected versionversion=f6a7182179c0ed788e3755ee2ed18c888ddcc33f <13cd1daeea848614e585b2c6ecc11ca9c8ab2500
  18. Affected versionversion=fe80658c08e3001c80c5533cd41abfbb0e0e28fd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1fc793d68d50dee4782ef2e808913d5dd880bcc6 <c1d3a84a67db910ce28a871273c992c3d7f9efb5; version=4.14.327 <4.15; version=4.19.296 <4.19.308; version=5.10.198 <5.10.211; version=5.15.135 <5.15.150; version=5.4.258 <5.4.270; version=559d697c5d072593d22b3e0bd8b8081108aeaf59 <4c3ce64bc9d36ca9164dd6c77ff144c121011aae; version=6.1.57 <6.1.80; version=6.5.7 <6.6; version=6.6; version=7626b9fed53092aa2147978070e610ecb61af844; version=96b2e1090397217839fcd6c9b6d8f5d439e705ed <dcb4d14268595065c85dc5528056713928e17243; version=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <359e54a93ab43d32ee1bff3c2f9f10cb9f6b6e79; version=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <804bd8650a3a2bf3432375f8c97d5049d845ce56; version=9d4c75800f61e5d75c1659ba201b6c0c7ead3070 <83340c66b498e49353530e41542500fc8a4782d6; version=cd1189956393bf850b2e275e37411855d3bd86bb <0da15a70395182ee8cb75716baf00dddc0bea38d; version=f6a7182179c0ed788e3755ee2ed18c888ddcc33f <13cd1daeea848614e585b2c6ecc11ca9c8ab2500; version=fe80658c08e3001c80c5533cd41abfbb0e0e28fd

Published CVSS scores

5.5NISTCVSS: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.

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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

CWE-131Incorrect Calculation of Buffer Size
T1499.004Endpoint Denial of Service: Application 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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