CVE-2026-64071

Kernel crash via uncleared HMB scatterlist pointer

Published Jul 19, 2026 · Updated Jul 19, 2026

Use-after-free in the Linux kernel nvme-pci driver allows attackers to crash the kernel after an HMB setup I/O error. nvme_free_host_mem() frees dev->hmb_sgt without clearing it, so the nvme_probe() error path calls the function again and dereferences the stale scatterlist. Reaching the crash requires successful HMB allocation, failure of nvme_set_host_mem(), and a second cleanup call; the demonstrated trigger is an unstable PCIe link to a Thunderbolt-attached NVMe device.

CVSS severityUnavailable
Unscored
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the Linux kernel nvme-pci driver allows attackers to crash the kernel after an HMB setup I/O error. nvme_free_host_mem() frees dev->hmb_sgt without clearing it, so the nvme_probe() error path calls the function again and dereferences the stale scatterlist. Reaching the crash requires successful HMB allocation, failure of nvme_set_host_mem(), and a second cleanup call; the demonstrated trigger is an unstable PCIe link to a Thunderbolt-attached NVMe device.

The record

CVE
CVE-2026-64071
Published
Jul 19, 2026
Updated
Jul 19, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
Unavailable
Privileges
Unavailable

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

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Is a vulnerable build present?

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

  1. Affected versionversion=6.13
  2. Affected versionversion=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <7c89f474005d8377525d2991930b7432ee193a52
  3. Affected versionversion=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <9525e3a6fbb1d126a22ab2ee86ddea25af581a7c
  4. Affected versionversion=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <b35a13036755c5803168a7cb93bc66035c3e65b8

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.13; version=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <7c89f474005d8377525d2991930b7432ee193a52; version=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <9525e3a6fbb1d126a22ab2ee86ddea25af581a7c; version=63a5c7a4b4c49ad86c362e9f555e6f343804ee1d <b35a13036755c5803168a7cb93bc66035c3e65b8

Published CVSS scores

No CVSS assessment is available in this record.

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.

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No observations available

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

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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