CVE-2026-68170Network attack vector

Remote kernel-memory corruption via unlocked backlog cleanup

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in Linux MPTCP 6.19 through 7.1.5 and 7.2 release candidates before 7.2-rc5 allows remote attackers to corrupt kernel memory. mptcp_close_ssk traverses the backlog without the socket lock or mptcp_data_lock, allowing concurrent receive processing to leave an skb pointing to a freed subflow socket. An unauthenticated MPTCP peer can time inbound traffic against subflow teardown, leading to memory disclosure, memory writes, or a kernel crash.

CVSS severity9.8
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux MPTCP 6.19 through 7.1.5 and 7.2 release candidates before 7.2-rc5 allows remote attackers to corrupt kernel memory. mptcp_close_ssk traverses the backlog without the socket lock or mptcp_data_lock, allowing concurrent receive processing to leave an skb pointing to a freed subflow socket. An unauthenticated MPTCP peer can time inbound traffic against subflow teardown, leading to memory disclosure, memory writes, or a kernel crash.

The record

CVE
CVE-2026-68170
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 10, 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=6.19
  2. Affected versionversion=ee458a3f314e9c669ddd227bf5ab08354d9e75cc <625fc6060864889fe3d370cdeffbbab762af3cb4
  3. Affected versionversion=ee458a3f314e9c669ddd227bf5ab08354d9e75cc <bd7aae448f6ee9d82599a4474664de1e6e91a535

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.19; version=ee458a3f314e9c669ddd227bf5ab08354d9e75cc <625fc6060864889fe3d370cdeffbbab762af3cb4; version=ee458a3f314e9c669ddd227bf5ab08354d9e75cc <bd7aae448f6ee9d82599a4474664de1e6e91a535

Published CVSS scores

9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5Amazon LinuxCVSS:3.1/AV:N/AC:H/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

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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