Critical 9.8Published Jul 27, 2026

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

Updated under an hour ago (Oct 27, 2026, 2:00 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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().

CVSS: 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-667
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	91edfca6f8b364d60cde3ddefaf7d03ddf35774b builds before 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf; from fda871c0ba5d2eed2cd1c881573168129da70058 before ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e; from fda871c0ba5d2eed2cd1c881573168129da70058 before c7874dad84b20433c0fe3919f291a762d40de08b; from fda871c0ba5d2eed2cd1c881573168129da70058 before e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1; from fda871c0ba5d2eed2cd1c881573168129da70058 before d306da8833e75f669d93424fd84940236f3850bc; from fda871c0ba5d2eed2cd1c881573168129da70058 before 2ed3c9d955e8cd6361f130623baa664a75fb345f; from fda871c0ba5d2eed2cd1c881573168129da70058 before 4606467a75cfc16721937272ed29462a750b60c8; 4b17476d809273617d3317fa0d4ae78aa488d760; and 2 more ranges	CNA record

References

References

https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf
https://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e
https://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b
https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1
https://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc
https://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f
https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.