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Linux CVE-2026-64391

| EUVDEUVD-2026-48935 CRITICAL
2026-07-25 Linux GHSA-83mf-wfc5-x4x3
Information Disclosure Linux
9.8
CVSS 3.1 · Vendor: Linux
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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

Unauthorized read/write of Alternate Data Streams in Linux ksmbd allows remote attackers to access or modify file extended attributes. The vulnerability, present in Linux kernel versions with ksmbd up to before patches 6.18.39, 6.12.96, 7.1.4

Affected VersionsENISA

Linux 0 <6.18.39
Linux patch: 7.2-rc1
Linux patch: 7.1.4
Linux 0 <7.1.4
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8f5d39971bbad9340d49cd41b0e2da9452a649d
Linux patch: 6.18.39
Linux 0 <6.12.96
Linux patch: 6.12.96
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2b4592cea214683de0f2ce6f8c22c097fb0ea1ab
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <baa5e094886fffa7e6272edcb5e08be5ce28262c
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <52a56cf53ec834c44ac1b4d16d585f26613ee5ce

Affected Packages

euvd linux fix: 6.12.96, 6.18.39, 7.1.4

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

Vendor (Linux) PRIMARY 9.8 CRITICAL
AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SUSE 5.5 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

4
CVSS changed
Jul 27, 2026 - 05:22 NVD
9.8 (CRITICAL)
Patch available
Jul 25, 2026 - 11:18 EUVD
CVE Published
Jul 25, 2026 - 08:50 cve.org
UNKNOWN (no severity yet)
CVE Published
Jul 25, 2026 - 08:50 cve.org
CRITICAL 9.8

DescriptionCVE.org

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

ksmbd: use opener credentials for ADS I/O

Alternate data streams are stored as xattrs. Unlike regular file I/O, their read and write paths therefore call VFS xattr helpers which recheck inode permissions and LSM policy using the current task credentials.

Run ADS I/O with the credentials captured when the SMB handle was opened.

Threat Intelligence Overview

EPSS Score
0.2%
Top 89% 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

49
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +49
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Information Disclosure MEDIUM

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

Same technique Information Disclosure

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CVE-2025-68613 HIGH POC
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7.8
CVE-2017-0147 HIGH POC
7.5

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-2026-64391 ADVISORY https://ubuntu.com/security/notices/USN-8726-1 ADVISORY https://ubuntu.com/security/notices/USN-8727-1 ADVISORY https://vuldb.com/vuln/383207 REF https://git.kernel.org/stable/c/222c4c52c3af2d0f68de31182710df3508a31095 REF https://git.kernel.org/stable/c/2ad5509dd576ae16d252d4698daf03002f9e0234 REF https://git.kernel.org/stable/c/2b4592cea214683de0f2ce6f8c22c097fb0ea1ab REF https://git.kernel.org/stable/c/52a56cf53ec834c44ac1b4d16d585f26613ee5ce REF https://git.kernel.org/stable/c/a8f5d39971bbad9340d49cd41b0e2da9452a649d REF https://git.kernel.org/stable/c/baa5e094886fffa7e6272edcb5e08be5ce28262c

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