CVE-2023-52527

Local denial of service via transport-header miscount

Published Mar 2, 2024 · Updated May 11, 2026

Improper length handling in affected Linux kernel versions allows local users to interrupt service through IPv6 L2TP socket writes. The l2tp_ip6_sendmsg() path adds transhdrlen to the requested length when the write queue already holds a partial packet, causing copy to exceed the remaining message data. A low-privileged local process must append MSG_SPLICE_PAGES data to a partially occupied socket buffer, producing a kernel warning and availability loss.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper length handling in affected Linux kernel versions allows local users to interrupt service through IPv6 L2TP socket writes. The l2tp_ip6_sendmsg() path adds transhdrlen to the requested length when the write queue already holds a partial packet, causing copy to exceed the remaining message data. A low-privileged local process must append MSG_SPLICE_PAGES data to a partially occupied socket buffer, producing a kernel warning and availability loss.

The record

CVE
CVE-2023-52527
Published
Mar 2, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 2, 2024CVE 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=3.5
  2. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <1fc793d68d50dee4782ef2e808913d5dd880bcc6
  3. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <559d697c5d072593d22b3e0bd8b8081108aeaf59
  4. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <7626b9fed53092aa2147978070e610ecb61af844
  5. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <96b2e1090397217839fcd6c9b6d8f5d439e705ed
  6. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <9d4c75800f61e5d75c1659ba201b6c0c7ead3070
  7. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <cd1189956393bf850b2e275e37411855d3bd86bb
  8. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <f6a7182179c0ed788e3755ee2ed18c888ddcc33f
  9. Affected versionversion=a32e0eec7042b21ccb52896cf715e3e2641fed93 <fe80658c08e3001c80c5533cd41abfbb0e0e28fd

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.5; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <1fc793d68d50dee4782ef2e808913d5dd880bcc6; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <559d697c5d072593d22b3e0bd8b8081108aeaf59; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <7626b9fed53092aa2147978070e610ecb61af844; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <96b2e1090397217839fcd6c9b6d8f5d439e705ed; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <9d4c75800f61e5d75c1659ba201b6c0c7ead3070; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <cd1189956393bf850b2e275e37411855d3bd86bb; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <f6a7182179c0ed788e3755ee2ed18c888ddcc33f; version=a32e0eec7042b21ccb52896cf715e3e2641fed93 <fe80658c08e3001c80c5533cd41abfbb0e0e28fd

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

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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.

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Technologies

Your stack

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Your stack

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