PatchaPalooza

CVE-2026-64533: fs/ntfs3: validate lcns_follow in log_replay conversion

CVE-2026-64533 is a vulnerability in fs/ntfs3: validate lcns_follow in log_replay conversion, rated Moderate by Microsoft, with a CVSS 3.1 base score of 5.5 (Medium). An attacker can exploit it by an attacker with local access, with low privileges and without user interaction. Microsoft has not reported exploitation in the wild. The EPSS model estimates a 0.14% probability of exploitation activity in the next 30 days, higher than 3% of all scored vulnerabilities. Microsoft released the fix on 6 August 2026, outside Patch Tuesday. It affects 1 product in 1 product family (Open Source Software).

Key facts

CVE ID
CVE-2026-64533
Severity
Medium CVSS 5.5
Microsoft severity
Moderate
Exploited in the wild
No
Publicly disclosed
No
Weakness
CWE-787
EPSS
0.14% (percentile 3%)
CISA KEV
Not listed
Released
Last updated
Patch Tuesday
July 2026 Patch Tuesday
Product families
Open Source Software

CVSS score and vector

Microsoft scores CVE-2026-64533 at 5.5 (temporal 5.1) using CVSS 3.1. Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U

MetricValue
Attack vectorLocal
Attack complexityLow
Privileges requiredLow
User interactionNone
ScopeUnchanged
Confidentiality impactNone
Integrity impactNone
Availability impactHigh
Exploit code maturityUnproven

NVD scores it 7.8 (HIGH) with CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

Affected products (1)

Open Source Software

ProductSecurity updateTypeFixed buildRestart
azl3 kernel 6.6.144.1-1 on Azure Linux 3.0CBL-Mariner ReleasesSecurity Update6.6.145.2-1No

NIST NVD data

NVD status
Awaiting Analysis
NVD CVSS
7.8 (HIGH)
NVD weakness
CWE-787
Published to NVD
NVD last modified

References

Revision history

VersionDateDescription
1.0Information published.

Sources