linux linux-kernel CVE-2026-64534 is a vulnerability in Linux Kernel
Published on July 27, 2026

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

NVD


Products Associated with CVE-2026-64534

Want to know whenever a new CVE is published for Linux Kernel? stack.watch will email you.

 

Affected Versions

Linux: Linux: