CVE-2026-21366 Integer Overflow or Wraparound in Data Network Stack & Connectivity
An integer overflow in the Qualcomm Snapdragon network stack allows memory corruption during packet processing, potentially leading to code execution or denial of service.
- 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-2026-21366?
CVE-2026-21366 is a high-severity vulnerability in Qualcomm Qam8255p Firmware, published on 4 Aug 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Memory corruption while processing a packet with a size close to the maximum allowed value.
Weakness: CWE-190
Which versions are affected by CVE-2026-21366?
It affects 33 products.
Products include Qualcomm Lemans Au Lgit Firmware, Qualcomm Lemansau Firmware, Qualcomm Qam8255p Firmware, Qualcomm Qam8295p Firmware, Qualcomm Qam8620p Firmware, Qualcomm Qamsrv1h Firmware and 27 more.
How do I fix CVE-2026-21366?
No fix has been published for CVE-2026-21366 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-21366 being exploited?
There is no known exploitation of CVE-2026-21366 in the wild and no public exploit code.
Other vulnerabilities in Qualcomm Qam8255p Firmware
Sources
Also known as GHSA-q2v3-gr28-5g2f.