CVE-2026-64534
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().
How to fix
- Linux Linux22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf, ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e, c7874dad84b20433c0fe3919f291a762d40de08b, e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1, d306da8833e75f669d93424fd84940236f3850bc, 2ed3c9d955e8cd6361f130623baa664a75fb345f, 4606467a75cfc16721937272ed29462a750b60c8, 5.10.261, 5.12 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 91edfca6f8b364d60cde3ddefaf7d03ddf35774b ≤ v < 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < c7874dad84b20433c0fe3919f291a762d40de08b, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < d306da8833e75f669d93424fd84940236f3850bc, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < 2ed3c9d955e8cd6361f130623baa664a75fb345f, fda871c0ba5d2eed2cd1c881573168129da70058 ≤ v < 4606467a75cfc16721937272ed29462a750b60c8, 4b17476d809273617d3317fa0d4ae78aa488d760, 5.10.20 ≤ v < 5.10.261, 5.11.3 ≤ v < 5.12, 5.12 | 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf, ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e, c7874dad84b20433c0fe3919f291a762d40de08b, e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1, d306da8833e75f669d93424fd84940236f3850bc, 2ed3c9d955e8cd6361f130623baa664a75fb345f, 4606467a75cfc16721937272ed29462a750b60c8, 5.10.261, 5.12 |
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