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VulnerabilityPublished Updated

CVE-2025-21894: Linux kernel · net: enetc: VFs do not support HWTSTAMP_TX_ONESTEP_SYNC

Affects Linux kernelSource GCVE Database

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Not known to be exploited.

Data as of 30 Oct 2026, 14:17 UTC

Severity
High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 1 Apr 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

AI-suggested

Until a fix is available, avoid using HWTSTAMP_TX_ONESTEP_SYNC with ENETC VFs to prevent kernel crashes.

Description

A vulnerability in the Linux kernel's ENETC virtual functions (VFs) causes a crash when attempting to use one-step hardware timestamping (HWTSTAMP_TX_ONESTEP_SYNC). This occurs because only the physical function (PF) can access the required PMa_SINGLE_STEP registers, and VFs lack this capability, leading to a kernel paging fault and crash.

References

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