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TI-2026-17389 Aliases CVE-2026-21537GHSA-c8x6-p29h-wm35

Microsoft Defender for Endpoint Linux Extension Remote Code Execution Vulnerability

Priority MEDIUM 41CWE-94Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Code execution
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from Microsoft.

Summary

Improper control of generation of code ('code injection') in Microsoft Defender for Linux allows an unauthorized attacker to execute code over an adjacent network.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00525 44th percentileScored 2026-11-07
Fix Fixed Microsoft Defender for Endpoint for Linux (Microsoft): 1.0.9.0

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MicrosoftMicrosoft Defender for Endpoint for Linux101.0.0 to before 1.0.9.01.0.9.0Patch availableCNA
  • Microsoft Defender for Endpoint for Linux VendorMicrosoft Affected 101.0.0 to before 1.0.9.0 Fixed in 1.0.9.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:microsoft:defender_for_endpoint:-:*:*:*:*:linux:*:*not specified by NVDVulnerableMicrosoft
  • cpe:2.3:a:microsoft:defender_for_endpoint:-:*:*:*:*:linux:*:* Versions not specified by NVD Vulnerable ·Microsoft

Remediation

  • Fix · CNA Microsoft Defender for Endpoint for Linux (Microsoft) Fixed in 1.0.9.0

Vendor assessments

Microsoft

Microsoft's page for this CVE →

Impact
Remote Code Execution
Exploited
No
Publicly disclosed
No
Exploitability
Exploitation Less Likely
ProductStatusPlan or fix
Microsoft Defender for Endpoint for LinuxFixed 1.0.9.0 · Security Update

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-21537
  2. 2026-10-03 Alias added: GHSA-c8x6-p29h-wm35

References

Patch 1

  • TI-2024-32723 Microsoft Defender for Endpoint on Android Spoofing Vulnerability CVSS 3.1HIGH 8.1
  • TI-2025-29747 Microsoft Defender for Endpoint Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.8
  • TI-2024-14076 Microsoft Defender for Endpoint Protection Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.8
  • TI-2022-16269 Microsoft Defender for Endpoint for Mac Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.8
  • TI-2026-40552 Microsoft Defender for Endpoint for Mac Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.0
  • TI-2026-37346 Microsoft Defender for Endpoint for Mac Elevation of Privilege Vulnerability CVSS 3.1HIGH 7.0
See all 15 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences