Bug 2391065 (CVE-2025-38514)

Summary: CVE-2025-38514 kernel: rxrpc: Fix oops due to non-existence of prealloc backlog struct
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: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's RxRPC network protocol implementation. An attacker can trigger a Denial of Service (DoS) by sending incoming network traffic to an RxRPC service socket that has been bound without configured call preallocation. Because the internal backlog structure is only allocated upon preallocation, processing an incoming call under these conditions causes a kernel crash and halts the system.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2025-08-26 15:09:35 UTC 
In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix oops due to non-existence of prealloc backlog struct

If an AF_RXRPC service socket is opened and bound, but calls are
preallocated, then rxrpc_alloc_incoming_call() will oops because the
rxrpc_backlog struct doesn't get allocated until the first preallocation is
made.

Fix this by returning NULL from rxrpc_alloc_incoming_call() if there is no
backlog struct.  This will cause the incoming call to be aborted.
Comment 1 Jon Moroney 2025-08-26 15:52:27 UTC Comment hidden (spam)