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Linux EUVDEUVD-2026-48944

| CVE-2026-64400 HIGH
2026-07-25 Linux GHSA-cg5c-7728-29v7
Linux Path Traversal
8.6
CVSS 3.1 · Vendor: Linux
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This Week Schedule remediation this week. Why: HIGH severity (CVSS 7.0-8.9).
Patch available 0.3% exploitation probability (EPSS)

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AnalysisAIv1 – Jul 27, 2026

Path traversal bypass in the Linux kernel's ksmbd SMB server allows authenticated users with write access to a share to create zero-length files or directories outside the exported share boundary. The flaw exists only when the share is configured with case-insensitive (caseless) filename handling. Patches are available; the vulnerability is not known to be actively exploited, has a low EPSS score (0.26%), and no public exploit has been identified.

Affected VersionsENISA

Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <54bab9ba5a9f156ffa9324fcbe5a356fd0242f95
Linux patch: 7.2-rc1
Linux 0 <7.1.4
Linux patch: 7.1.4
Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c9a4f1327eb71efbf14842e7b8a6d965077eb67

Affected Packages

euvd linux fix: 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 8.6 HIGH
AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
SUSE HIGH

Primary rating from Vendor (Linux).

CVSS VectorVendor: Linux

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

Lifecycle Timeline

4
CVSS changed
Jul 27, 2026 - 05:22 NVD
8.6 (HIGH)
Patch available
Jul 25, 2026 - 11:18 EUVD
CVE Published
Jul 25, 2026 - 08:50 cve.org
HIGH 8.6
CVE Published
Jul 25, 2026 - 08:50 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

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

ksmbd: prevent path traversal bypass by restricting caseless retry

ksmbd_vfs_path_lookup() enforces LOOKUP_BENEATH to restrict path resolution within the share root. When a crafted path attempts to escape the share boundary using parent-directory components ('..'), vfs_path_parent_lookup() detects this and immediately fails, returning -EXDEV.

However, a bug exists in __ksmbd_vfs_kern_path() under caseless mode. The function fails to intercept the -EXDEV error and erroneously falls through to the caseless retry logic, which is intended only for genuinely missing files. During this retry process, the path is reconstructed, leading to an unintended LOOKUP_BENEATH bypass that allows write-capable users to create zero-length files or directories outside the exported share.

Fix this by ensuring that the execution only proceeds to the caseless lookup retry when the error is specifically -ENOENT. Any other errors, such as -EXDEV from a path traversal attempt, must be returned immediately.

Threat Intelligence Overview

EPSS Score
0.3%
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 HIGH
CISA KEV No
Public POC No
EPSS 0.3%
Patch available Yes
Active threat No
Deciding rule
HIGH severity (CVSS 7.0-8.9)
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

43
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +43
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Path Traversal HIGH

Path traversal exploits occur when applications use user-controlled input to construct file system paths without proper validation.

Same technique Path Traversal

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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-2026-64400 ADVISORY https://ubuntu.com/security/notices/USN-8726-1 ADVISORY https://ubuntu.com/security/notices/USN-8727-1 ADVISORY https://vuldb.com/vuln/383188 REF https://git.kernel.org/stable/c/21f050439db157f2afcc19885dec14549ca6ffc0 REF https://git.kernel.org/stable/c/54bab9ba5a9f156ffa9324fcbe5a356fd0242f95 REF https://git.kernel.org/stable/c/8c9a4f1327eb71efbf14842e7b8a6d965077eb67 REF https://git.kernel.org/stable/c/a1c331d98313380c38f616c8b28b890ec8ef9c28 REF https://git.kernel.org/stable/c/cfb5a56c218888f9d74165dff0c282cd0be97983 REF https://git.kernel.org/stable/c/eec1dd2586c4016b7555a5d047db2b3756459fb2

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