CVE-2025-21927
This vulnerability allows an attacker to corrupt memory in the Linux kernel’s NVMe over TCP implementation by sending a packet with an invalid header length. The flaw can lead to arbitrary code execution or denial of service and has been fixed in recent kernel releases.
An official fix is available, so this entry is kept for 30 days and then removed automatically.
Who is affected
Linux kernel, especially versions 6.14 and earlier that do not contain the patch. Typical users are system administrators and organizations running Linux servers.
Real-world impact
An attacker could send crafted NVMe over TCP packets to a vulnerable system, causing memory corruption that could lead to arbitrary code execution, privilege escalation, or crashing the system.
Why this severity
The CVSS score of 9.8 reflects the vulnerability’s high impact on confidentiality, integrity, and availability, and the fact that it can be exploited remotely without authentication or user interaction.
What to do about it
- 01Check the current kernel version on the system.
- 02Update the kernel to the latest stable release that includes the nvme-tcp patch (e.g., 6.14 or newer).
- 03Reboot the system to load the updated kernel.
NVD-referenced vendor advisory
Timeline
- Apr 1, 2025 · Apr 1, 2025PublishedDisclosed and added to the National Vulnerability Database.
- Jul 30, 2026 · 7d agoAdvisory updatedThe NVD record was last revised.
- Jul 30, 2026 · 6d agoOfficial fix availableA vendor patch or mitigation now exists — see the remediation steps above.