CVE-2023-52778

Stream corruption via oversized MPTCP GSO packets

Published May 21, 2024 · Updated May 11, 2026

Data corruption in Linux kernel MPTCP 5.19 through 6.6.2 allows local users to corrupt received streams via oversized egress packets. mptcp_sendmsg_frag permits a subflow's sk_gso_max_size to exceed the 64 KiB DSS length limit, so the transmitted length is misrepresented on the wire. Exploitation requires local low-privileged access and an MPTCP flow that generates oversized GSO packets; the bounded consequence is stream corruption and service interruption.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Data corruption in Linux kernel MPTCP 5.19 through 6.6.2 allows local users to corrupt received streams via oversized egress packets. mptcp_sendmsg_frag permits a subflow's sk_gso_max_size to exceed the 64 KiB DSS length limit, so the transmitted length is misrepresented on the wire. Exploitation requires local low-privileged access and an MPTCP flow that generates oversized GSO packets; the bounded consequence is stream corruption and service interruption.

The record

CVE
CVE-2023-52778
Published
May 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 21, 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=5.19
  2. Affected versionversion=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <342b528c0e849bed9def76dadaa470d3af678e94
  3. Affected versionversion=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <57ced2eb77343a91d28f4a73675b05fe7b555def
  4. Affected versionversion=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <70ff9b65a72885b3a2dfde6709da1f19b85fa696
  5. Affected versionversion=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <9fce92f050f448a0d1ddd9083ef967d9930f1e52

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <342b528c0e849bed9def76dadaa470d3af678e94; version=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <57ced2eb77343a91d28f4a73675b05fe7b555def; version=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <70ff9b65a72885b3a2dfde6709da1f19b85fa696; version=7c4e983c4f3cf94fcd879730c6caa877e0768a4d <9fce92f050f448a0d1ddd9083ef967d9930f1e52

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.1SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/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 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

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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