Bug 2356619 (CVE-2025-21903)

Summary: CVE-2025-21903 kernel: mctp i3c: handle NULL header address
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: low Docs Contact:
Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Description OSIDB Bzimport 2025-04-01 16:02:50 UTC 
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.
Comment 1 Robb Gatica 2025-04-02 03:00:19 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025040128-CVE-2025-21903-4dbf@gregkh/T