Bug 2327203 (CVE-2024-50294)

Summary: CVE-2024-50294 kernel: rxrpc: Fix missing locking causing hanging calls
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2327216    
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Description OSIDB Bzimport 2024-11-19 02:03:42 UTC 
In the Linux kernel, the following vulnerability has been resolved:

rxrpc: Fix missing locking causing hanging calls

If a call gets aborted (e.g. because kafs saw a signal) between it being
queued for connection and the I/O thread picking up the call, the abort
will be prioritised over the connection and it will be removed from
local->new_client_calls by rxrpc_disconnect_client_call() without a lock
being held.  This may cause other calls on the list to disappear if a race
occurs.

Fix this by taking the client_call_lock when removing a call from whatever
list its ->wait_link happens to be on.
Comment 1 Avinash Hanwate 2024-11-19 04:17:05 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024111958-CVE-2024-50294-0ac7@gregkh/T