VulnerabilityPublished 16 Dec 2025Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in e61dfd906ad027a4ade1f89e5fe706a3fcd52527 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 17:30 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in e61dfd906ad027a4ade1f89e5fe706a3fcd52527, bc2b881a0896c111c1041d8bb1f92a3b3873ace5, b62a59c18b692f892dcb8109c1c2e653b2abc95c +1

Exploitation evidence

Disclosed: evidence found.
CVE published 16 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to e61dfd906ad027a4ade1f89e5fe706a3fcd52527, bc2b881a0896c111c1041d8bb1f92a3b3873ace5, b62a59c18b692f892dcb8109c1c2e653b2abc95c or 06da08d9355bf8e2070459bbedbe372ccc02cc0e.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ cf1ef3f0719b4dcb74810ed507e2a2540f9811b4, < e61dfd906ad027a4ade1f89e5fe706a3fcd52527	Fixed in e61dfd906ad027a4ade1f89e5fe706a3fcd52527
LinuxLinux	Affected ≥ cf1ef3f0719b4dcb74810ed507e2a2540f9811b4, < bc2b881a0896c111c1041d8bb1f92a3b3873ace5	Fixed in bc2b881a0896c111c1041d8bb1f92a3b3873ace5
LinuxLinux	Affected ≥ cf1ef3f0719b4dcb74810ed507e2a2540f9811b4, < b62a59c18b692f892dcb8109c1c2e653b2abc95c	Fixed in b62a59c18b692f892dcb8109c1c2e653b2abc95c
LinuxLinux	Affected ≥ cf1ef3f0719b4dcb74810ed507e2a2540f9811b4, < 06da08d9355bf8e2070459bbedbe372ccc02cc0e	Fixed in 06da08d9355bf8e2070459bbedbe372ccc02cc0e
LinuxLinux	Affected =4.12	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: tcp: use dst_dev_rcu() in tcp_fastopen_active_disable_ofo_check() Use RCU to avoid a pair of atomic operations and a potential UAF on dst_dev()->flags.

References

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