Linux Kernel RDMA/erdma Reference Count Leak Vulnerability

A reference count leak vulnerability has been identified in the Linux kernel's RDMA/erdma component. This issue arises in the 'erdma_mmap' function, where the 'rdma_user_mmap_entry_get()' function is called to take a reference, but the reference is not properly released when no longer needed. The missing 'rdma_user_mmap_entry_put()' call in the error handling path has been added to address this leak. This vulnerability affects the Linux kernel stable tree.

Impact

Exploitation of this vulnerability can lead to a reference count leak, which may cause memory management issues such as use-after-free vulnerabilities or memory corruption.

Remediation

Users can upgrade to the latest version of the Linux kernel stable tree to address this vulnerability.