CVE-2026-64534 - nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path

CVE-2026-64534 - nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path

https://cvefeed.io/rssfeed/latest.atom / Mon, 07/27/2026 - 13:07
CVE ID :CVE-2026-64534
Published : July 27, 2026, 8:16 a.m. | 2 hours, 35 minutes ago
Description :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().
Severity: 0.0 | NA
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