CVE-2026-64534

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-64534

Key Details

CVE	CVE-2026-64534
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

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(). (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-64534
CVE	https://www.cve.org/CVERecord?id=CVE-2026-64534

Source

Reference

NVD

CVE