CVE-2025-21927
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk37th percentile - higher than 37% of all known CVEs
Summary
In the Linux kernel's nvme-tcp module, a memory corruption vulnerability was found in nvme_tcp_recv_pdu(). The function does not validate the header length, allowing an attacker to write data outside the allocated memory area.
Risk Assessment
The organization is at risk of remote memory corruption, which could lead to system crashes or arbitrary code execution.
Recommendation
Immediately update the Linux kernel to a version containing the fix that rejects packets with invalid header length.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: fix potential memory corruption in nvme_tcp_recv_pdu() nvme_tcp_recv_pdu() doesn't check the validity of the header length. When header digests are enabled, a target might send a packet with an invalid header length (e.g. 255), causing nvme_tcp_verify_hdgst() to access memory outside the allocated area and cause memory corruptions by overwriting it with the calculated digest. Fix this by rejecting packets with an unexpected header length.