High [CVE-2026-64534] check INIT_FAILED before nvmet_req_uninit in digest error path
This high-severity Red Hat Linux advisory covers CVE-2026-64534 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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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(). A flaw was found in the Linux kernel's NVMe over TCP (nvmet-tcp) implementation.
When a data digest mismatch occurs, a reference count underflow can happen due to an unconditional cleanup call. This issue can lead to a use-after-free condition and ultimately result in a permanent workqueue deadlock, causing a Denial of Service (DoS) for the system.
Red Hat severity: Important — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-911.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · high-confidence parse· fetched 25 days ago·verify at source
- kernel-0:6.12.0-211.58.1.el10_2
- kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10
- kernel-0:4.18.0-553.166.1.el8_10
- kernel-0:5.14.0-687.51.1.el9_8
- RHSA-2026:70498
- RHSA-2026:70403
- RHSA-2026:70402
- RHSA-2026:71232
Official advisory · high-confidence parse· fetched 25 days ago·verify at source
Mitigation
Upgrade to a fixed release: kernel-0:6.12.0-211.58.1.el10_2, kernel-rt-0:4.18.0-553.166.1.rt7.507.el8_10, kernel-0:4.18.0-553.166.1.el8_10, kernel-0:5.14.0-687.51.1.el9_8, RHSA-2026:70498, RHSA-2026:70403. That is the remediation for this advisory.
The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.
Official advisory · high-confidence parse· fetched 25 days ago·verify at source
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