Bug 2383421 (CVE-2025-38403)

Summary: CVE-2025-38403 kernel: vsock/vmci: Clear the vmci transport packet properly when initializing it
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: ldu, mcascell, rkeshri
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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Doc Text:
A flaw was found in the Linux kernel's vsock/vmci component. A local attacker with low privileges could exploit a vulnerability where the vmci_transport_packet structure is not properly cleared during initialization. This can lead to the use of uninitialized data, potentially allowing for information disclosure, privilege escalation, or a denial of service (DoS).
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-07-25 14:03:52 UTC 
In the Linux kernel, the following vulnerability has been resolved:

vsock/vmci: Clear the vmci transport packet properly when initializing it

In vmci_transport_packet_init memset the vmci_transport_packet before
populating the fields to avoid any uninitialised data being left in the
structure.
Comment 1 Jon Moroney 2025-07-25 18:50:20 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025072504-CVE-2025-38403-0da0@gregkh/T