Vulnerability in Linux

CVE-2025-21903

In the Linux kernel, the following vulnerability has been resolved: mctp i3c: handle NULL header address daddr can be NULL if there is no neighbour table entry present, in that case the tx packet should be dropped. saddr will usually be set by MCTP core, but check for NULL in case a packet is transmitted by a different protocol.

EPSS: 0.002 (9.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Affected products

References

Frequently asked questions

What is CVE-2025-21903?
CVE-2025-21903 is a medium-severity vulnerability in Linux. CVSS score: 5.5/10. Published 2025-04-01.
How severe is CVE-2025-21903?
Medium severity. CVSS v3 base score is 5.5 out of 10.