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Linux CVE-2026-64319

| EUVDEUVD-2026-49031 CRITICAL
Out-of-bounds Read (CWE-125)
2026-07-25 Linux GHSA-78p6-7rph-cp36
Buffer Overflow Information Disclosure Linux
Critical
Disputed · 9.1 Vendor: Linux
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Vulnerability Assessment

Weakness
CWE
CWE-125
ASVS 5.0
V15 - Secure Coding and Architecture Bounds checking, read limits
MITRE ATT&CK

1 technique across 1 tactic: Collection

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Act Now Prioritize within 24-48h. Why: CRITICAL severity.
Patch available 0.2% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Out-of-bounds heap read in the Linux kernel's nvmet-auth module allows pre-authentication remote attackers to read up to 526 bytes of heap memory beyond a crafted DHCHAP_REPLY message. By sending an NVMe-oF authentication reply with a small transfer length but inflated hash and DH value length fields, an unauthenticated attacker can extract sensitive data or cause a denial-of-service. Patches are available in upstream stable kernels.

Affected VersionsENISA

Linux 6.0
Linux db1312dd95488b5e6ff362ff66fcf953a46b1821 <999f6205ede984a786f35f727b01f971b98e215d
Linux db1312dd95488b5e6ff362ff66fcf953a46b1821 <6d7649c1231dac14d906985d2936967e23041c26
Linux patch: 6.6.145
Linux patch: 7.1.4
Linux db1312dd95488b5e6ff362ff66fcf953a46b1821 <caa71b3a43ea5c13fe7141cb019ebcb03b8ac857
Linux patch: 6.18.39
Linux patch: 6.12.96
Linux db1312dd95488b5e6ff362ff66fcf953a46b1821 <80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0
Linux patch: 7.2-rc1
Linux db1312dd95488b5e6ff362ff66fcf953a46b1821 <3a413ece2504c70aa34a20be4dafec04e8c741f9
Linux patch: 0

Affected Packages

euvd linux no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

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  • Exploit and PoC references, threat intelligence from 22 sources
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Severity by source

Sources disagree (Medium–Critical)
Vendor (Linux) PRIMARY 9.1 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
SUSE 8.2 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Red Hat 7.0 MEDIUM

vuln.today treats the vendor’s rating as authoritative. A higher third-party CVSS (e.g. CISA-ADP) is shown for transparency but does not drive the headline severity.

CVSS VectorVendor: Linux

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

Lifecycle Timeline

4
CVSS changed
Jul 27, 2026 - 05:22 NVD
9.1 (CRITICAL)
Patch available
Jul 25, 2026 - 11:18 EUVD
CVE Published
Jul 25, 2026 - 08:49 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 25, 2026 - 08:49 cve.org
CRITICAL 9.1

DescriptionCVE.org

In the Linux kernel, the following vulnerability has been resolved:

nvmet-auth: validate reply message payload bounds against transfer length

nvmet_auth_reply() accesses the variable-length rval[] array using attacker-controlled hl (hash length) and dhvlen (DH value length) fields without verifying they fit within the allocated buffer of tl bytes.

A malicious NVMe-oF initiator can craft a DHCHAP_REPLY message with a small transfer length but large hl/dhvlen values, causing out-of-bounds heap reads when the target processes the DH public key (rval + 2*hl) or performs the host response memcmp.

With DH authentication configured, the OOB pointer is passed directly to sg_init_one() and read by crypto_kpp_compute_shared_secret(), reaching up to 526 bytes past the buffer. This is exploitable pre-authentication.

Add bounds validation ensuring sizeof(*data) + 2*hl + dhvlen <= tl before any access to the variable-length fields.

Discovered by Atuin - Automated Vulnerability Discovery Engine.

Threat Intelligence Overview

EPSS Score
0.2%
Top 83% exploitable
Data Quality
6 sources
Confidence: High
EUVD 🇯🇵JVN NVD CVE.org EPSS MSRC Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity CRITICAL
CISA KEV No
Public POC No
EPSS 0.2%
Patch available Yes
Active threat No
Deciding rule
CRITICAL severity
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Scheduled
Exploitation· derived
None
System Exposure· derived
Open
Automatable· derived
Yes
Human Impact· derived
Medium

Priority Score

46
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +46
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.

Information Disclosure MEDIUM

Information disclosure occurs when an application unintentionally exposes sensitive data that aids attackers in reconnaissance or directly compromises security.

Same weakness CWE-125 – Out-of-bounds Read

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Vendor StatusVendor

SUSE

Severity: Important
Product Status
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise Desktop 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 15 SP7 Affected
SUSE Linux Enterprise High Availability Extension 16.0 Affected

References

Advisories & patches
ADVISORY https://nvd.nist.gov/vuln/detail/CVE-2026-64319 ADVISORY https://ubuntu.com/security/notices/USN-8726-1 ADVISORY https://ubuntu.com/security/notices/USN-8727-1 ADVISORY https://vuldb.com/vuln/383114 REF https://git.kernel.org/stable/c/04fb6ff8b87a0ffff3860ff52bdb2fd04b31ece5 REF https://git.kernel.org/stable/c/3a413ece2504c70aa34a20be4dafec04e8c741f9 REF https://git.kernel.org/stable/c/6d7649c1231dac14d906985d2936967e23041c26 REF https://git.kernel.org/stable/c/80cd28b56ab62d3e7ed0a7bf05282e6d3ee5b2a0 REF https://git.kernel.org/stable/c/999f6205ede984a786f35f727b01f971b98e215d REF https://git.kernel.org/stable/c/caa71b3a43ea5c13fe7141cb019ebcb03b8ac857

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