CVE-2026-64319Network attack vector

Pre-auth heap disclosure or crash via DHCHAP_REPLY bounds

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in nvmet-auth in affected Linux Kernel releases allows remote attackers to read heap memory or crash a target. nvmet_auth_reply() trusts the DHCHAP_REPLY hl and dhvlen fields and indexes rval beyond the tl-byte transfer buffer during DH-key handling or response comparison. The path is reachable before authentication when an NVMe-oF target has DH authentication configured, and reads can extend 526 bytes beyond the heap buffer.

CVSS severity9.1
Critical
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds read in nvmet-auth in affected Linux Kernel releases allows remote attackers to read heap memory or crash a target. nvmet_auth_reply() trusts the DHCHAP_REPLY hl and dhvlen fields and indexes rval beyond the tl-byte transfer buffer during DH-key handling or response comparison. The path is reachable before authentication when an NVMe-oF target has DH authentication configured, and reads can extend 526 bytes beyond the heap buffer.

The record

CVE
CVE-2026-64319
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1210
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=6.0
  2. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <3a413ece2504c70aa34a20be4dafec04e8c741f9
  3. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <6d7649c1231dac14d906985d2936967e23041c26
  4. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0
  5. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <999f6205ede984a786f35f727b01f971b98e215d
  6. Affected versionversion=db1312dd95488b5e6ff362ff66fcf953a46b1821 <caa71b3a43ea5c13fe7141cb019ebcb03b8ac857

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.0; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <3a413ece2504c70aa34a20be4dafec04e8c741f9; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <6d7649c1231dac14d906985d2936967e23041c26; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <999f6205ede984a786f35f727b01f971b98e215d; version=db1312dd95488b5e6ff362ff66fcf953a46b1821 <caa71b3a43ea5c13fe7141cb019ebcb03b8ac857

Published CVSS scores

9.1kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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.

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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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1210Exploitation of Remote Services

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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