CVE-2026-21385

Q: What is the severity of CVE-2026-21385?

CVE-2026-21385 has a CVSS score of 7.8 (HIGH). This CVE describes a memory corruption vulnerability in alignment-based memory allocation functions. Attackers can exploit this to execute arbitrary code or cause denial of service. The vulnerability affects Android devices with Qualcomm components and potentially other systems using similar memory alignment implementations.

7.8 HIGH

📋 TL;DR

This CVE describes a memory corruption vulnerability in alignment-based memory allocation functions. Attackers can exploit this to execute arbitrary code or cause denial of service. The vulnerability affects Android devices with Qualcomm components and potentially other systems using similar memory alignment implementations.

💻 Affected Systems

Products:

Android devices with Qualcomm chipsets
Qualcomm system-on-chip components

Versions: Android versions prior to March 2026 security patch level

Operating Systems: Android

Default Config Vulnerable: ⚠️ Yes

Notes: Specific Qualcomm chipset models may vary; check vendor advisories for exact affected hardware

📦 What is this software?

⚠️ Risk & Real-World Impact

🔴

Worst Case

Remote code execution leading to complete system compromise, data theft, or persistent backdoor installation

🟠

Likely Case

Application crashes, denial of service, or limited information disclosure

🟢

If Mitigated

Contained process crashes without privilege escalation due to sandboxing or memory protection features

🌐 Internet-Facing: MEDIUM

🏢 Internal Only: MEDIUM

🎯 Exploit Status

Public PoC: ✅ No

Weaponized: UNKNOWN

Unauthenticated Exploit: ✅ No

Complexity: MEDIUM

Exploitation requires specific memory manipulation conditions; no public exploits known as of advisory publication

🛠️ Fix & Mitigation

✅ Official Fix

Patch Version: Android March 2026 security patch level or later

Vendor Advisory: https://source.android.com/docs/security/bulletin/2026/2026-03-01

Restart Required: Yes

Instructions:

1. Check for system updates in Android Settings > System > System update. 2. Apply March 2026 or later security patch. 3. Reboot device after installation completes.

🔧 Temporary Workarounds

Memory allocation hardening

all

Implement additional bounds checking and validation for memory alignment operations

🧯 If You Can't Patch

Isolate affected devices from untrusted networks
Implement application sandboxing and memory protection controls

🔍 How to Verify

Check if Vulnerable:

Check Android security patch level in Settings > About phone > Android version > Security patch level

Check Version:

adb shell getprop ro.build.version.security_patch

Verify Fix Applied:

Verify security patch level shows March 2026 or later date

📡 Detection & Monitoring

Log Indicators:

Memory allocation failures
Process crashes with alignment-related errors
Kernel panic logs

Network Indicators:

Unusual outbound connections following process crashes

SIEM Query:

Process:Terminated AND (Error:Memory OR Error:Alignment) AND Device:Android

📊 Metadata

CVE ID: CVE-2026-21385

CVSS v3 Score: 7.8 (HIGH)

CVSS Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE: CWE-190

Published: March 2, 2026

Last Updated: March 4, 2026

🔗 References

https://docs.qualcomm.com/product/publicresources/securitybulletin/march-2026-bulletin.html Patch,Vendor Advisory
https://source.android.com/docs/security/bulletin/2026/2026-03-01 Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-21385 US Government Resource

📋 TL;DR

💻 Affected Systems

📦 What is this software?

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Fastconnect 6800 Firmware by Qualcomm

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