CVE-2026-21371 Buffer Over-read in WinBlast Driver
A buffer over-read in the WinBlast driver allows attackers to cause memory corruption, potentially leading to code execution or denial of service on Qualcomm Snapdragon devices.
- 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-2026-21371?
CVE-2026-21371 is a high-severity memory corruption vulnerability in Qualcomm Aqt1000 Firmware, published on 6 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Memory Corruption when retrieving output buffer with insufficient size validation.
Weakness: CWE-126
Which versions are affected by CVE-2026-21371?
It affects 52 products.
Products include Qualcomm Aqt1000 Firmware, Qualcomm Cologne Firmware, Qualcomm Fastconnect 6200 Firmware, Qualcomm Fastconnect 6700 Firmware, Qualcomm Fastconnect 6800 Firmware, Qualcomm Fastconnect 6900 Firmware and 46 more.
How do I fix CVE-2026-21371?
No fix has been published for CVE-2026-21371 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-21371 being exploited?
There is no known exploitation of CVE-2026-21371 in the wild and no public exploit code.
Other vulnerabilities in Qualcomm Aqt1000 Firmware
- CVE-2025-21479 Qualcomm Multiple Chipsets Incorrect Authorization
- CVE-2025-21480 Qualcomm Multiple Chipsets Incorrect Authorization
- CVE-2023-28562 Buffer Copy Without Checking Size of Input in QESL
- CVE-2022-40514 Buffer copy without checking size of input in WLAN Firmware
- CVE-2022-22096 Memory corruption in Snapdragon Connectivity, Snapdragon Mobile
Sources
Also known as GHSA-hfh3-pr7q-frpw.