CVE-2026-21383 Reusing a Nonce, Key Pair in Encryption in HLOS

High 7.1 Published 6 Jul 2026 Updated 8 Jul 2026

Reusing nonces in AES-GCM key wrapping within Qualcomm Snapdragon HLOS allows attackers to compromise cryptographic security and potentially access protected data.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2026-21383?

CVE-2026-21383 is a high-severity vulnerability in Qualcomm Fastconnect 6900 Firmware, published on 6 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Cryptographic Issue when using a static initialization vector for AES-GCM key wrapping, which requires a unique value for each call to ensure security.

Weakness: CWE-323

Which versions are affected by CVE-2026-21383?

It affects 53 products.

Products include Qualcomm Fastconnect 6900 Firmware, Qualcomm Fastconnect 7800 Firmware, Qualcomm Lemans Au Lgit Firmware, Qualcomm Lemansau Firmware, Qualcomm Pandeiro Firmware, Qualcomm Qam8255p Firmware and 47 more.

How do I fix CVE-2026-21383?

No fix has been published for CVE-2026-21383 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-21383 being exploited?

There is no known exploitation of CVE-2026-21383 in the wild and no public exploit code.

All Qualcomm Fastconnect 6900 Firmware vulnerabilities

Sources

Also known as GHSA-3p8m-mr3f-jqg6.