CVE-2025-21903

mctp i3c: handle NULL header address

Description

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.

N/A

CVSS

Severity:

EPSS 0.02%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/d8be54c35aee29d96d1350b1b6f153be4da37c07
https://git.kernel.org/stable/c/740bf9c9b715cc327d34b1e2d4ee79fcd4c47a56
https://git.kernel.org/stable/c/cf7ee25e70c6edfac4553d6b671e8b19db1d9573

Frequently Asked Questions

What is the severity of CVE-2025-21903?: CVE-2025-21903 has not yet been assigned a CVSS score.
How to fix CVE-2025-21903?: To fix CVE-2025-21903, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-21903 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2025-21903 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-21903?: CVE-2025-21903 affects Linux Linux, Linux Linux.

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