CVE-2026-64534

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path<br /> <br /> In nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected,<br /> nvmet_req_uninit() is called unconditionally. However, if the command<br /> arrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init()<br /> had returned false and percpu_ref_tryget_live() was never executed. The<br /> unconditional percpu_ref_put() inside nvmet_req_uninit() then causes a<br /> refcount underflow, leading to a WARNING in<br /> percpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and<br /> eventually a permanent workqueue deadlock.<br /> <br /> Check cmd-&gt;flags &amp; NVMET_TCP_F_INIT_FAILED before calling<br /> nvmet_req_uninit(), matching the existing pattern in<br /> nvmet_tcp_execute_request().