CVE-2026-68169

Use-after-free read via unlocked MPTCP entry

Published Aug 10, 2026 · Updated Aug 10, 2026

Use-after-free in the MPTCP userspace path manager in Linux allows local users to read a freed address entry during a race. mptcp_pm_userspace_get_local_id() drops its spinlock before copying the entry ID, allowing concurrent deletion to free the entry first. Reachability requires a narrow overlap between an MP_JOIN SYN and a local MPTCP subflow-destroy request; the confirmed consequence is a stale one-byte kernel read.

CVSS severity2.0
Low
EPSS probability0.21%
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 the MPTCP userspace path manager in Linux allows local users to read a freed address entry during a race. mptcp_pm_userspace_get_local_id() drops its spinlock before copying the entry ID, allowing concurrent deletion to free the entry first. Reachability requires a narrow overlap between an MP_JOIN SYN and a local MPTCP subflow-destroy request; the confirmed consequence is a stale one-byte kernel read.

The record

CVE
CVE-2026-68169
Published
Aug 10, 2026
Updated
Aug 10, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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=005a3ad289eb604216dcaa03646de36cb08624a0
  2. Affected versionversion=6.1.79 <6.2
  3. Affected versionversion=6.6.18 <6.6.151
  4. Affected versionversion=6.7.6 <6.8
  5. Affected versionversion=6.8
  6. Affected versionversion=e373bfc8ec3d6496ec7e11dd7f4d087a44b1009a
  7. Affected versionversion=ed34dfa19ddbd1e4c85a73636f8cba0211025ea4 <d2c3760b45f2f481a4dd4c5adef4a29dfabd948f
  8. Affected versionversion=f012d796a6de662692159c539689e47e662853a8 <31ce5af66891f79998fb2e8b8df08e3c98fd72e3
  9. Affected versionversion=f012d796a6de662692159c539689e47e662853a8 <40dde4b5d98279471a70e5c8bb713182738c00d9
  10. Affected versionversion=f012d796a6de662692159c539689e47e662853a8 <9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9
  11. Affected versionversion=f012d796a6de662692159c539689e47e662853a8 <d64f6c02495f3fad674038cfa7ec049671b59e7b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=005a3ad289eb604216dcaa03646de36cb08624a0; version=6.1.79 <6.2; version=6.6.18 <6.6.151; version=6.7.6 <6.8; version=6.8; version=e373bfc8ec3d6496ec7e11dd7f4d087a44b1009a; version=ed34dfa19ddbd1e4c85a73636f8cba0211025ea4 <d2c3760b45f2f481a4dd4c5adef4a29dfabd948f; version=f012d796a6de662692159c539689e47e662853a8 <31ce5af66891f79998fb2e8b8df08e3c98fd72e3; version=f012d796a6de662692159c539689e47e662853a8 <40dde4b5d98279471a70e5c8bb713182738c00d9; version=f012d796a6de662692159c539689e47e662853a8 <9bc6d5e4ca9f3cbb41d43400b3a31cb0403796c9; version=f012d796a6de662692159c539689e47e662853a8 <d64f6c02495f3fad674038cfa7ec049671b59e7b

Published CVSS scores

2.5Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:N
3.6SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:L/I:N/A:L
2.0SUSECVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N

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

No sourced classifications are available.

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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