CVE-2025-68188

Local kernel disclosure and crash via stale dst_dev

Published Dec 16, 2025 · Updated Dec 16, 2025

Use-after-free in Linux kernel 4.12 through 6.12.57 and 6.13 through 6.17.7 allows local users to read kernel memory or crash the system. The tcp_fastopen_active_disable_ofo_check() path reads dst->dev->flags without RCU protecting the device pointer, permitting a concurrent lifetime change to leave the dereference stale. Reaching the path requires local low-privileged execution, TCP Fast Open state, and a high-complexity race; published scoring bounds impact to confidentiality and availability.

CVSS severity6.3
Medium
EPSS probability0.20%
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 kernel 4.12 through 6.12.57 and 6.13 through 6.17.7 allows local users to read kernel memory or crash the system. The tcp_fastopen_active_disable_ofo_check() path reads dst->dev->flags without RCU protecting the device pointer, permitting a concurrent lifetime change to leave the dereference stale. Reaching the path requires local low-privileged execution, TCP Fast Open state, and a high-complexity race; published scoring bounds impact to confidentiality and availability.

The record

CVE
CVE-2025-68188
Published
Dec 16, 2025
Updated
Dec 16, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 16, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <06da08d9355bf8e2070459bbedbe372ccc02cc0e
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62a59c18b692f892dcb8109c1c2e653b2abc95c
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bc2b881a0896c111c1041d8bb1f92a3b3873ace5

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <06da08d9355bf8e2070459bbedbe372ccc02cc0e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b62a59c18b692f892dcb8109c1c2e653b2abc95c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <bc2b881a0896c111c1041d8bb1f92a3b3873ace5

Published CVSS scores

6.3SUSECVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:H
5.8SUSECVSS:4.0/AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:N/VA:H/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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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