CVE-2025-38089
sunrpc: handle SVC_GARBAGE during svc auth processing as auth error
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sunrpc: handle SVC_GARBAGE during svc auth processing as auth error
In the Linux kernel, the following vulnerability has been resolved: sunrpc: handle SVC_GARBAGE during svc auth processing as auth error tianshuo han reported a remotely-triggerable crash if the client sends a kernel RPC server a specially crafted packet. If decoding the RPC reply fails in such a way that SVC_GARBAGE is returned without setting the rq_accept_statp pointer, then that pointer can be dereferenced and a value stored there. If it's the first time the thread has processed an RPC, then that pointer will be set to NULL and the kernel will crash. In other cases, it could create a memory scribble. The server sunrpc code treats a SVC_GARBAGE return from svc_authenticate or pg_authenticate as if it should send a GARBAGE_ARGS reply. RFC 5531 says that if authentication fails that the RPC should be rejected instead with a status of AUTH_ERR. Handle a SVC_GARBAGE return as an AUTH_ERROR, with a reason of AUTH_BADCRED instead of returning GARBAGE_ARGS in that case. This sidesteps the whole problem of touching the rpc_accept_statp pointer in this situation and avoids the crash.
Reserved 2025-04-16 | Published 2025-06-30 | Updated 2025-06-30 | Assigner Linuxgit.kernel.org/...c/599c489eea793821232a2f69a00fa57d82b0ac98
git.kernel.org/...c/353e75b55e583635bf71cde6abcec274dba05edd
git.kernel.org/...c/c90459cd58bb421d275337093d8e901e0ba748dd
git.kernel.org/...c/94d10a4dba0bc482f2b01e39f06d5513d0f75742
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