CVE-2026-64320: nvmet: fix pre-auth out-of-bounds heap read in Discovery Get Log Page

highCVSS 8.4CVE-2026-64320

CSIRTS triage

vendor: Linux product: nvmetOther

What: There is a pre-auth out-of-bounds heap read vulnerability in the nvmet driver.
Who is affected: Deployments of the nvmet driver are affected.
Urgency: Remediation is necessary to prevent potential exploitation, although exploitation status is currently unknown.
Action: Update to the latest version of the nvmet driver.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: high — CVSS 8.4
Published: 2026-07-14
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-64320

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-643200.73% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 51% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-64320	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

criticalCVE-2026-64320: In the Linux kernel, the following vulnerability has been resolved: nvmet: fix pre-auth out-of…nvd

Recent advisories for nvmet

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

criticalCVE-2026-64535: In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential U…nvd · 2026-07-27
criticalCVE-2026-64534: In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: check INIT_FAIL…nvd · 2026-07-27
unknownCVE-2026-64321: In the Linux kernel, the following vulnerability has been resolved: nvme: target: rdma: fix nd…nvd · 2026-07-25
criticalCVE-2026-64320: In the Linux kernel, the following vulnerability has been resolved: nvmet: fix pre-auth out-of…nvd · 2026-07-25
criticalCVE-2026-64319: In the Linux kernel, the following vulnerability has been resolved: nvmet-auth: validate reply…nvd · 2026-07-25
highCVE-2026-63980: In the Linux kernel, the following vulnerability has been resolved: net/handshake: Use spin_lo…nvd · 2026-07-19