CVE-2026-64534

Summary

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().

Affected Software

VendorProductVersion RangeStatus
LinuxLinux91edfca6f8b364d60cde3ddefaf7d03ddf35774b < 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decfaffected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < ba35b1c674ca3841c0dfadd698f2c1b3ec542d4eaffected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < c7874dad84b20433c0fe3919f291a762d40de08baffected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1affected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < d306da8833e75f669d93424fd84940236f3850bcaffected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < 2ed3c9d955e8cd6361f130623baa664a75fb345faffected
LinuxLinuxfda871c0ba5d2eed2cd1c881573168129da70058 < 4606467a75cfc16721937272ed29462a750b60c8affected
LinuxLinux4b17476d809273617d3317fa0d4ae78aa488d760affected
LinuxLinux5.10.20 < 5.10.261affected
LinuxLinux5.11.3 < 5.12affected
LinuxLinux5.12affected
LinuxLinux0 < 5.12unaffected
LinuxLinux5.10.261 <= 5.10.*unaffected
LinuxLinux5.15.212 <= 5.15.*unaffected
LinuxLinux6.1.178 <= 6.1.*unaffected
LinuxLinux6.6.145 <= 6.6.*unaffected
LinuxLinux6.12.97 <= 6.12.*unaffected
LinuxLinux6.18.40 <= 6.18.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References