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CVE-2025-68188: tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check()

highCVSS 7.8CVE-2025-68188

CSIRTS triage

vendor: Linuxproduct: Linux kernel TCPOther
What
The tcp_fastopen_active_disable_ofo_check() function does not properly use dst_dev_rcu() for device access.
Who is affected
Systems running the Linux kernel with TCP FastOpen in use.
Urgency
High severity with CVSS 7.8; not currently exploited but incorrect RCU protection is critical.
Action
Apply Linux kernel patch CVE-2025-68188 when available or update to a patched kernel version.

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Details

Source
Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity
high — CVSS 7.8
Published
2026-08-06
Exploitation
Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-68188

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-68188coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for tcp

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

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