CVE-2026-64534

CVE CVE-2026-64534EUVD EUVD-2026-49112Published 2026-07-27T06:32:34.000ZLast changed 2026-08-05T12:42:44.000ZCVSS 9.8

What the advisory describes

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().

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

Linux — Linux patch: 5.10.261; patch: 5.15.212; 4b17476d809273617d3317fa0d4ae78aa488d760; fda871c0ba5d2eed2cd1c881573168129da70058 <e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1; fda871c0ba5d2eed2cd1c881573168129da70058 <c7874dad84b20433c0fe3919f291a762d40de08b; patch: 6.12.97; fda871c0ba5d2eed2cd1c881573168129da70058 <4606467a75cfc16721937272ed29462a750b60c8; fda871c0ba5d2eed2cd1c881573168129da70058 <2ed3c9d955e8cd6361f130623baa664a75fb345f; patch: 0; 5.10.20 <5.10.261; fda871c0ba5d2eed2cd1c881573168129da70058 <d306da8833e75f669d93424fd84940236f3850bc; 5.11.3 <5.12; fda871c0ba5d2eed2cd1c881573168129da70058 <ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e; patch: 6.6.145; 5.12; patch: 7.1; patch: 6.1.178; patch: 6.18.40; 91edfca6f8b364d60cde3ddefaf7d03ddf35774b <22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

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Linux — Linux

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