VulnSocial

CVE-2026-64534Disclosure

LOWCVSS 9.8 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

  • Patch affected systems immediately

Recommended action window: Monitor and triage in normal cycle

NVD 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().

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0.5/ 10 priority

Sources & remediation

Other references
Weakness type (CWE)
CWE-667

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

AVAILABLE

Momentum

STABLE

Threat summary

  • Patch or workaround signal is available
  • 2 mentions across 2 observed days
  • Momentum state: stable

What's happening

  • Patch or workaround mentioned in 1 signal
  • Technical details provided in 2 signals
  • Disclosure: 1 classified signal
  • Peaked 1d ago at 1 mentions (2026-07-27); latest day: 1
  • 2 total mentions across 2 days

Deep dive

Activity timeline2 mentions / 2d
00111Mentions · 2026-07-27: 1Mentions · 2026-08-03: 1Patch / Workaround · 2026-08-03: 1Technical Details · 2026-07-27: 1Technical Details · 2026-08-03: 107-2708-03
Signal classification2 categories
Disclosure
150.0%
Patch
150.0%
Referenced assets2 URLs
Classification over time
DateTotalLabels
2026-07-271
Disclosure1
2026-08-031
Patch1
Full discourse2 posts
  • SecAlerts@SecAlertsCo
    Patch

    💾 Linux kernel CVE-2026-64534: use-after-free in nvmet-tcp via data digest mismatch in the recv digest error path. CVSS 9.8, network-accessible, no auth needed. Patch your NVMe-oF hosts. #cybersecurity #ciso #cto #vulnerabilities #linux https://secalerts.co/vulnerability/CVE-2026-64534?utm_campaign=x https://t.co/N8UXQvZeI7

    Post summary

    The tweet announces CVE‑2026‑64534, a high‑severity Linux kernel use‑after‑free affecting NVMe‑oF hosts, and urges users to apply the available patch.

    01010207
    871 followersView on X
  • Vulmon Vulnerability Feed@VulmonFeeds
    Disclosure

    CVE-2026-64534 Linux Kernel NVMe-TCP Digest Error Path Reference Count Underflow https://vulmon.com/vulnerabilitydetails?qid=CVE-2026-64534

    Post summary

    The entry presents a brief disclosure of CVE-2026-64534, noting it as a Linux Kernel reference count underflow in NVMe‑TCP, and links to a vulnerability details page without detailing PoC, exploits, or patches.

    00000107
    4.1K followersView on X

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