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.

Published · last modified .

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.

EPSS exploit prediction

EPSS: 0.002 (8.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 8.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2025-21903: held from 0.002 to 0.002.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

  • Linux — versions c8755b29b58ec65be17bcb8c40763d2dcb1f1db5, 6.7, 0
  • Linux Kernel — versions 6.14

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.