CVE-2026-64020Network attack vector

NVMe I/O interruption via leaked dma_vec tracking

Published Jul 19, 2026 · Updated Jul 19, 2026

Resource exhaustion in the Linux Kernel NVMe PCI driver 6.17 through 7.0.10 allows remote attackers to interrupt NVMe I/O. The P2P PRP completion path retains an allocated dma_vec tracking object even though peer-to-peer memory is never unmapped, exhausting the single-element dmavec pool. Reachability requires an NVMe-oF server with p2pmem-enabled namespaces backed by local PCIe NVMe; without in-band authentication, a remote read or write causes persistent resource failures until reboot.

CVSS severity7.5
High
EPSS probability0.34%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in the Linux Kernel NVMe PCI driver 6.17 through 7.0.10 allows remote attackers to interrupt NVMe I/O. The P2P PRP completion path retains an allocated dma_vec tracking object even though peer-to-peer memory is never unmapped, exhausting the single-element dmavec pool. Reachability requires an NVMe-oF server with p2pmem-enabled namespaces backed by local PCIe NVMe; without in-band authentication, a remote read or write causes persistent resource failures until reboot.

The record

CVE
CVE-2026-64020
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 19, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 19, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.17
  2. Affected versionversion=b8b7570a7ec872f2a27b775c4f8710ca8a357adf <24ea0de233d9ebb5ebd6f6018eaf2084af25e3dd
  3. Affected versionversion=b8b7570a7ec872f2a27b775c4f8710ca8a357adf <85686c72966c5ee637893f124ddb31a1cace7bee

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.17; version=b8b7570a7ec872f2a27b775c4f8710ca8a357adf <24ea0de233d9ebb5ebd6f6018eaf2084af25e3dd; version=b8b7570a7ec872f2a27b775c4f8710ca8a357adf <85686c72966c5ee637893f124ddb31a1cace7bee

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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