CVE-2025-38544

Description

In the Linux kernel, the following vulnerability has been resolved:rxrpc: Fix bug due to prealloc collisionWhen userspace is using AF_RXRPC to provide a server, it has to preallocateincoming calls and assign to them call IDs that will be used to threadrelated recvmsg() and sendmsg() together. The preallocated call IDs willautomatically be attached to calls as they come in until the pool is empty.To the kernel, the call IDs are just arbitrary numbers, but userspace canuse the call ID to hold a pointer to prepared structs. In any case, theuser isnt permitted to create two calls with the same call ID (call IDsbecome available again when the call ends) and EBADSLT should result fromsendmsg() if an attempt is made to preallocate a call with an in-use callID.However, the cleanup in the error handling will trigger both assertions inrxrpc_cleanup_call() because the call isnt marked complete and isntmarked as having been released.Fix this by setting the call state in rxrpc_service_prealloc_one() and thenmarking it as being released before calling the cleanup function.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234